In severe cases of shock,Multiple Choicea positive feedback cycle develops.the baroreceptor reflexes are adequate for returning blood pressure to normal.renin secretion decreases, causing a rise in blood pressure.the normal regulatory mechanisms for blood pressure control are adequate to return the body to homeostasis.the cardiac output rises dramatically.

Select the CORRECT answer. When the baroreceptor reflex is triggered by a decline in blood pressure:Group of answer choicesSympathetic activity increases and cardiac output increases.Peripheral resistance decreases.Sympathetic activity increases.Cardiac output increases.

which of the following contributes significantly to the rapid control of aeterial pressure by sympathetic stimulation?a) cushing reactionb) renin angiotensin aldosterone systemc) fine tuning of the baroreceptor reflexd) vasoconstriction of large veins

Which of the following statements about the baroreceptor reflex control of blood pressure is INCORRECT?Group of answer choicesBaroreceptors are stretch receptors that detect distension of the vascular walls in which they are located.Changes in arterial pressure are primarily detected by baroreceptors located in the carotid sinuses and aortic arch.An increase in arterial pressure raises the firing rate of afferent baroreceptor nerves.A decrease in arterial pressure is likely to result in decreased sympathetic activation and increased parasympathetic activation of the sinoatrial node.

When blood pressure receptors sense a drop in blood pressure, they their firing rate.

Which of these conditions indicate positive feedback has occured? aBlood pressure decreases greatly; blood flow to the heart is inadequate, and blood pressure decreases. bHot temperatures increase your body temperature above normal; you sweat. cCold temperatures decrease your body temperature below normal; you shiver. dBlood pressure decreases; as a result, your heart rate increases.