David Story
Jessica Thompson
Tuesday July 2, 2013
GE259
Human Anatomy 2
Case Study A. David’s skin is cool to the touch, pale, and blotchy. Which blood vessels regulate blood flow to the capillaries of the skin? What changes in the peripheral vasculature of the skin might cause the changes in its appearance? * The proximal end of a metarteriole is surrounded by scattered smooth muscle fibers whose contraction and relaxation help regulate blood flow. The changes that take place in the peripheral vasculature of the skin are blood flow decreasing, an increase in vascular resistance increases blood pressure; a decrease in vascular resistance has the opposite effect. B. David’s blood pressure is low. Which blood vessels regulate blood pressure? * The blood vessels that regulate blood pressure is called baroreceptors, they send impulses to the cardiovascular center to help regulate blood pressure. C. What structures control the flow of David’s blood into his capillary beds? * The structures that control the flow of David’s blood into his capillary beds are a network of 10-100 capillaries that arises from a single metarteriole. In most of the body, blood can flow through a capillary network from an arteriole into a venule. D. How would David’s blood reservoirs respond to his low systemic blood pressure? * As blood leaves the aorta and flows through the systemic circulation, its pressure falls progressively as the distance from the left ventricle increases. E. How would the loss of plasma proteins affect the capillary exchange in David’s tissue? * The loss of plasma proteins would affect the capillary exchange in David’s tissue because it would lead to circulatory insufficiency, there’s not enough blood pressure to keep his blood moving throughout his body. F. David has lost blood volume, resulting in a drop in blood pressure. His automatic nervous system countered the dropping blood pressure by stimulated vasoconstriction. How does
Tuesday July 2, 2013
GE259
Human Anatomy 2
Case Study A. David’s skin is cool to the touch, pale, and blotchy. Which blood vessels regulate blood flow to the capillaries of the skin? What changes in the peripheral vasculature of the skin might cause the changes in its appearance? * The proximal end of a metarteriole is surrounded by scattered smooth muscle fibers whose contraction and relaxation help regulate blood flow. The changes that take place in the peripheral vasculature of the skin are blood flow decreasing, an increase in vascular resistance increases blood pressure; a decrease in vascular resistance has the opposite effect. B. David’s blood pressure is low. Which blood vessels regulate blood pressure? * The blood vessels that regulate blood pressure is called baroreceptors, they send impulses to the cardiovascular center to help regulate blood pressure. C. What structures control the flow of David’s blood into his capillary beds? * The structures that control the flow of David’s blood into his capillary beds are a network of 10-100 capillaries that arises from a single metarteriole. In most of the body, blood can flow through a capillary network from an arteriole into a venule. D. How would David’s blood reservoirs respond to his low systemic blood pressure? * As blood leaves the aorta and flows through the systemic circulation, its pressure falls progressively as the distance from the left ventricle increases. E. How would the loss of plasma proteins affect the capillary exchange in David’s tissue? * The loss of plasma proteins would affect the capillary exchange in David’s tissue because it would lead to circulatory insufficiency, there’s not enough blood pressure to keep his blood moving throughout his body. F. David has lost blood volume, resulting in a drop in blood pressure. His automatic nervous system countered the dropping blood pressure by stimulated vasoconstriction. How does