Does blood clot reduce blood flow?

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I read that blood clot reduces blood flow from few website and from doing an A level biology question; and if this blood clot is formed in pulmonary thrombosis, this can reduce gas exchange in lung.



However, how are we so certain this is true? If there is a blood clot, then blood pressure around that region increases I believe thus implying the blood will travel faster in that region? If so, then we can't firmly conclude blood clot will reduce blood flow as although blood clot will reduce the lumen of the vessel, the blood will also be travelling faster.










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    3












    $begingroup$


    I read that blood clot reduces blood flow from few website and from doing an A level biology question; and if this blood clot is formed in pulmonary thrombosis, this can reduce gas exchange in lung.



    However, how are we so certain this is true? If there is a blood clot, then blood pressure around that region increases I believe thus implying the blood will travel faster in that region? If so, then we can't firmly conclude blood clot will reduce blood flow as although blood clot will reduce the lumen of the vessel, the blood will also be travelling faster.










    share|improve this question











    $endgroup$














      3












      3








      3





      $begingroup$


      I read that blood clot reduces blood flow from few website and from doing an A level biology question; and if this blood clot is formed in pulmonary thrombosis, this can reduce gas exchange in lung.



      However, how are we so certain this is true? If there is a blood clot, then blood pressure around that region increases I believe thus implying the blood will travel faster in that region? If so, then we can't firmly conclude blood clot will reduce blood flow as although blood clot will reduce the lumen of the vessel, the blood will also be travelling faster.










      share|improve this question











      $endgroup$




      I read that blood clot reduces blood flow from few website and from doing an A level biology question; and if this blood clot is formed in pulmonary thrombosis, this can reduce gas exchange in lung.



      However, how are we so certain this is true? If there is a blood clot, then blood pressure around that region increases I believe thus implying the blood will travel faster in that region? If so, then we can't firmly conclude blood clot will reduce blood flow as although blood clot will reduce the lumen of the vessel, the blood will also be travelling faster.







      human-anatomy cardiology






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 15 at 11:21







      Bøbby Leung

















      asked Jan 15 at 7:23









      Bøbby LeungBøbby Leung

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      1656




















          1 Answer
          1






          active

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          5












          $begingroup$

          A blood clot can nearly completely or completely block an artery, in which case the blood flow will be reduced or stopped.



          How do we know this?



          Pulmonary Embolism (Merck Manuals):




          Pulmonary infarction is when some of the lung tissue does not receive
          enough blood flow and oxygen and appears on imaging studies to die due
          to blockage of a lung blood vessel by a pulmonary embolus.




          An embolus is a blood clot that usually develops in the leg veins in individuals with deep venous thrombosis, detaches and travels to a certain pulmonary artery and blocks it.



          Similarly, atheroma (atherosclerotic plaque) that builds up within the artery and only partially blocks it, can reduce the blood flow to the target organ. For example, a partial blockage of a coronary artery can result in decreased blood supply to the heart and consequently in angina pectoris or myocardial infarction. It is then the investigation called coronary angiography that can show that a certain coronary artery is partially blocked.



          When a clot interferes with blood flow (Harvard.edu):




          In venous thromboembolism, a blood clot slows or stops the flow of
          blood through the veins...







          share|improve this answer











          $endgroup$












          • $begingroup$
            Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
            $endgroup$
            – Bøbby Leung
            Jan 17 at 4:34










          • $begingroup$
            I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
            $endgroup$
            – Jan
            Jan 17 at 9:23










          Your Answer





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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          5












          $begingroup$

          A blood clot can nearly completely or completely block an artery, in which case the blood flow will be reduced or stopped.



          How do we know this?



          Pulmonary Embolism (Merck Manuals):




          Pulmonary infarction is when some of the lung tissue does not receive
          enough blood flow and oxygen and appears on imaging studies to die due
          to blockage of a lung blood vessel by a pulmonary embolus.




          An embolus is a blood clot that usually develops in the leg veins in individuals with deep venous thrombosis, detaches and travels to a certain pulmonary artery and blocks it.



          Similarly, atheroma (atherosclerotic plaque) that builds up within the artery and only partially blocks it, can reduce the blood flow to the target organ. For example, a partial blockage of a coronary artery can result in decreased blood supply to the heart and consequently in angina pectoris or myocardial infarction. It is then the investigation called coronary angiography that can show that a certain coronary artery is partially blocked.



          When a clot interferes with blood flow (Harvard.edu):




          In venous thromboembolism, a blood clot slows or stops the flow of
          blood through the veins...







          share|improve this answer











          $endgroup$












          • $begingroup$
            Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
            $endgroup$
            – Bøbby Leung
            Jan 17 at 4:34










          • $begingroup$
            I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
            $endgroup$
            – Jan
            Jan 17 at 9:23















          5












          $begingroup$

          A blood clot can nearly completely or completely block an artery, in which case the blood flow will be reduced or stopped.



          How do we know this?



          Pulmonary Embolism (Merck Manuals):




          Pulmonary infarction is when some of the lung tissue does not receive
          enough blood flow and oxygen and appears on imaging studies to die due
          to blockage of a lung blood vessel by a pulmonary embolus.




          An embolus is a blood clot that usually develops in the leg veins in individuals with deep venous thrombosis, detaches and travels to a certain pulmonary artery and blocks it.



          Similarly, atheroma (atherosclerotic plaque) that builds up within the artery and only partially blocks it, can reduce the blood flow to the target organ. For example, a partial blockage of a coronary artery can result in decreased blood supply to the heart and consequently in angina pectoris or myocardial infarction. It is then the investigation called coronary angiography that can show that a certain coronary artery is partially blocked.



          When a clot interferes with blood flow (Harvard.edu):




          In venous thromboembolism, a blood clot slows or stops the flow of
          blood through the veins...







          share|improve this answer











          $endgroup$












          • $begingroup$
            Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
            $endgroup$
            – Bøbby Leung
            Jan 17 at 4:34










          • $begingroup$
            I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
            $endgroup$
            – Jan
            Jan 17 at 9:23













          5












          5








          5





          $begingroup$

          A blood clot can nearly completely or completely block an artery, in which case the blood flow will be reduced or stopped.



          How do we know this?



          Pulmonary Embolism (Merck Manuals):




          Pulmonary infarction is when some of the lung tissue does not receive
          enough blood flow and oxygen and appears on imaging studies to die due
          to blockage of a lung blood vessel by a pulmonary embolus.




          An embolus is a blood clot that usually develops in the leg veins in individuals with deep venous thrombosis, detaches and travels to a certain pulmonary artery and blocks it.



          Similarly, atheroma (atherosclerotic plaque) that builds up within the artery and only partially blocks it, can reduce the blood flow to the target organ. For example, a partial blockage of a coronary artery can result in decreased blood supply to the heart and consequently in angina pectoris or myocardial infarction. It is then the investigation called coronary angiography that can show that a certain coronary artery is partially blocked.



          When a clot interferes with blood flow (Harvard.edu):




          In venous thromboembolism, a blood clot slows or stops the flow of
          blood through the veins...







          share|improve this answer











          $endgroup$



          A blood clot can nearly completely or completely block an artery, in which case the blood flow will be reduced or stopped.



          How do we know this?



          Pulmonary Embolism (Merck Manuals):




          Pulmonary infarction is when some of the lung tissue does not receive
          enough blood flow and oxygen and appears on imaging studies to die due
          to blockage of a lung blood vessel by a pulmonary embolus.




          An embolus is a blood clot that usually develops in the leg veins in individuals with deep venous thrombosis, detaches and travels to a certain pulmonary artery and blocks it.



          Similarly, atheroma (atherosclerotic plaque) that builds up within the artery and only partially blocks it, can reduce the blood flow to the target organ. For example, a partial blockage of a coronary artery can result in decreased blood supply to the heart and consequently in angina pectoris or myocardial infarction. It is then the investigation called coronary angiography that can show that a certain coronary artery is partially blocked.



          When a clot interferes with blood flow (Harvard.edu):




          In venous thromboembolism, a blood clot slows or stops the flow of
          blood through the veins...








          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jan 17 at 9:20

























          answered Jan 15 at 8:11









          JanJan

          1,391611




          1,391611











          • $begingroup$
            Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
            $endgroup$
            – Bøbby Leung
            Jan 17 at 4:34










          • $begingroup$
            I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
            $endgroup$
            – Jan
            Jan 17 at 9:23
















          • $begingroup$
            Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
            $endgroup$
            – Bøbby Leung
            Jan 17 at 4:34










          • $begingroup$
            I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
            $endgroup$
            – Jan
            Jan 17 at 9:23















          $begingroup$
          Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
          $endgroup$
          – Bøbby Leung
          Jan 17 at 4:34




          $begingroup$
          Thank you for the answer, but I'm not sure if your last paragraph answers the question as I understand that decrease in cross sectional area can potentially decrease the flow rate (as there is a smaller cross section for blood to travel through) but this decrease can be compensated by an increase in fluid velocity thus the end result is that flow rate is not changed - this is the idea behind the continuity equation in physics. But I get your argument in the first few paragraph.
          $endgroup$
          – Bøbby Leung
          Jan 17 at 4:34












          $begingroup$
          I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
          $endgroup$
          – Jan
          Jan 17 at 9:23




          $begingroup$
          I deleted the last paragraph and added one new source. Also, look at the first image in this coronary angiography article and you'll see that a part of the coronary artery is narrowed, not completely blocked, so the flow of the contrast substance is not discontinued. But that narrowing results in decreased blood flow and hence in angina pectoris or myocardial infarction. So, it is a result from which you can conclude that the blood flow is decreased.
          $endgroup$
          – Jan
          Jan 17 at 9:23

















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