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level: Level 4

Questions and Answers List

Question	Answer
they are responsible for the rapid, moment-to moment regulation of blood pressure act by changing the activity of the sympathetic nervous system	Baroreflexes
A fall in BP causes __ to send fewer impulses to CV centers in the spinal cord. This prompts a reflex response of increased sympathetic and decreased parasympathetic output to the heart and vasculature, resulting in vasoconstriction and increased cardiac output. These changes result in a compensatory rise in BP	pressure-sensitive neurons (baroreceptors in the aortic arch and carotid sinuses)
Decrease in Blood Pressure Responses (Decrease or Increase) 1 Sympathetic Activity 2 Renal Blood Flow 3 Renin 4 B1 adrenoceptors	. 1 Increase 2 Decreased 3 Increase 4 Increase
Baroreceptors in the kidney respond to reduced arterial pressure (and to sympathetic stimulation of β1-adrenoceptors) by releasing the enzyme __ Low sodium intake and greater sodium loss also increase __	renin
converts angiotensinogen to angiotensin I, which is converted in turn to angiotensin II, in the presence of ACE. angiotensin II is a potent circulating vasoconstrictor, constricting both arterioles and veins, resulting in an increase in BP	Renin
stimulates aldosterone secretion, leading to increased renal sodium reabsorption and increased blood volume, which contribute to a further increase in blood pressure.	Angiotensin II