HLSC-128 Chapter Notes - Chapter 8: Sympathetic Nervous System, Vascular Resistance, Histamine
17 Sep 2016
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Hlst 128: in class notes + supplemental cpt. 8 textbook notes. Human physiology: from cells to systems (3rd canadian ed. Arteries: made up of more smooth muscle and a larger amount of ecm than veins, little resistance to blood flow compared to arterioles. Allows blood to quickly be transported: because of their structure arteries is able to expand and relax with each heartbeat. The squiggly structure seen when arteries are put under a microscope. Allow the arterial wall to stretch without breaking: during ventricular systole the aorta and other arteries expand and act as pressure reservoirs. Prevents potential damage to smaller bold vessels down stream: during diastole blood is still being pushed through the body. Driven by blood in the pressure reservoir as elastic recoil occurs in arteries. Constant blood flow throughout the body: blood pressure. The amount of force that blood exerts against a vessel wall. Dependent on volume and the compliance (stretch-ability) of the blood vessel.
