Question 11 0.25 pts Describe the mechanism that the body uses to maintain blood

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Question 11 0.25 pts Describe the mechanism that the body uses to maintain blood pressure when you go from a lying to a standing position. Blood Pressure drops gravity causes blood to settle in thelower when a person goes from a lying to standing position. When you stand up, "part of your body. Blood pressure receptors known as (sensors) detect change in blood pressure. baroreceptors are specialized sensory neurons in the walls of the arotic arch in the vessel wall Information is sent from sensors to the The [Select ] heart and blood vessels (mainly arterioles), both of which are Sdlect ) pressure. Heart rate and amount of blood pumped are increased causing an increase in blood pressure Vasoconstriction of arterioles) [ Select initiated in order to correct it. This example isSelect pressure) reverses the direction of the initial change idecreased blood pressure "and the carotid sinuses that measure the degree of stretch (control center) via sensory nerves. (control center) analyzes the change in blood pressure and sends a nerve impulse to the to correct the decrease in blood -| blood pressureThus if BP is too high or too low. a reflex change in cardiac output is feedback because the response (increased blood Question 12 0.25 pts

Explanation / Answer

Blood pressure drops when a person goes from lying to standing position. When you stand up gravity causes the blood to settle in the lower part of your body. Blood pressure receptors known as baroreceptors detect changes in the blood pressure. Baroreceprors are specialized sensory neurons in the walls of the aortic arch and carotid sinuses that measure the degree of stretch in the vessel wall. Information is sent from sensors to the medulla oblongata via sensory nerves. The medulla oblongata analyzes the change in the blood pressure and sends a nerve impulse to the heart and blood vessels, both of which are effectors to correct the decrease in blood pressure.

Heart rate and the amount of blood pumped are increased an increase in the blood pressure. Vasoconstriction of arterioles increases the blood pressure. Thus, if the BP. is too high or too low, a reflex change in cardiac output is initiated inorder to correct it. This exmaple is negative feedback because the response reverses the direction of initial change.

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