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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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o2blea o2blea
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10 years ago
Heart failure causes blood pressure to increase via vasoconstrictors. How does this help blood flow or cardiac input (venous return)!?...Based on what I know from physics it would decrease blood flow and ultimately cause less venous return (since there would be an increase in resistance). Furthermore, vasoconstrictors like angiotensin II would not help combat the lower cardiac output and thus ischemia. Why is the body so obsessed with increasing blood pressure in conditions of low blood flow, when pressure doesn't give an indication of blood flow?
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tomsawyertomsawyer
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10 years ago
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blood pressure controls how much blood is moving and at what  rate high blood pressure results in more blood flow at à faster rate which means heart works harder more strain .... lower results is less blood at slower rate means not enough blood is reaching vital organs both are equally bad
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