Question

PART 1: When a subject moves from horizontal to progressively more upright, there is a ["rise", "drop"] in blood pressure in the upper parts of the body. This is commonly associated with a feeling of dizziness and is termed ["baroreceptor reflex", "orthostatic hypotension", "orthostatic hypertension"] .

PART 2: The pressure change in part one is detected by the ["osmoreceptors", "photoreceptors", "chemoreceptors", "baroreceptors"] in the carotid sinuses and aortic arch which then initiate ["more", "fewer"] impulses sent to the cardiovascular control center in the medulla oblongata. As a compensatory response to the pressure change, the cardiovascular control center increases ["sympathetic", "parasympathetic"] and decreasing ["sympathetic", "parasympathetic"] firing. This will ["increase", "decrease"] heart rate, which will ["increase", "decrease"] cardiac output and constrict arterioles, ["increasing", "decreasing"] total peripheral resistance. these mechanisms will collectively ["increase", "decrease"]  the mean arterial pressure..

Answer 1

PART 1: When a subject moves from horizontal to progressively more upright, there is a drop in blood pressure in the upper parts of the body. This is commonly associated with a feeling of dizziness and is termed orthostatic hypotension.

PART 2: The pressure change in part one is detected by the baroreceptors in the carotid sinuses and aortic arch which then initiate fewer impulses sent to the cardiovascular control center in the medulla oblongata. As a compensatory response to the pressure change, the cardiovascular control center increases sympathetic and decreasing parasympathetic firing. This will increase heart rate, which will increase cardiac output and constrict arterioles, increasing total peripheral resistance. These mechanisms will collectively increase the mean arterial pressure.