Introduction:
The body’s water content is regulated so that the total volume of water in the body remains constant. Thus, the volume of water taken into the body is equal to the volume lost each day.
Answer to Problem 1RAC
The correct answer is an option (a). The levels of angiotensin II increase.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a). The levels of angiotensin II increase. The juxtaglomerular apparatus stimulates the sensation of thirst by responding to lower blood pressure by releasing renin. Renin than stimulate the formation of angiotensin ii, which leads to the secretion of aldosterone. Aldosterone increase vasoconstriction. That complete process stimulates the sensation of thirst. So, the correct answer is an option (a).
Explanation for incorrect answer:
Option (b). The osmolality of the blood decreases. It is an incorrect option because an increase in extracellular fluid or blood osmolality leads to a sensation of thirst. It is detected by the specialized cells in the supraoptic nucleus that initiates neural circuit activity.
Option (c). Blood pressure increases. This is a wrong statement because a decrease in blood pressure stimulates the sensation of thirst. It is detected by the baroreceptors, which send the action potential to the brain through a sensory neuron.
Option (d). Renin secretion decreases. The decrease in blood pressure does not stimulate the thirst sensation. The decrease in renin secretion also decreases the formation of angiotensin and aldosterone, which is responsible for thirst sensation. So, this is an incorrect answer.
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Chapter 27 Solutions
SEELEY'S ANATOMY+PHYSIOLOGY
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- If a person develops high blood pressure, one of the compensatory mechanisms that comes into play is the fluid shift mechanism. This mechanism causes Select one: a. water to shift from the capillaries into the interstitial spaces. b. water to shift from inside cells into the extracellular fluid. c. water to stay inside the capillaries. d. increased filtration in the kidney, thereby increasing urine output. e. water to shift from the interstitial space into the capillaries.arrow_forward26) Factors that INCREASE the secretion of ADH include __________. a. increased concentration of sodium ions in the ECF b. water deprivation c. increased osmolarity of the ECF d. decreased renal blood flow e. all of the abovearrow_forwardWhich of the following is NOT an action of angiotensin II? Select one: a. Increases thirst b. Vasoconstriction of arterioles c. Decreases peripheral resistance d. Increases aldosterone secretion e. Increases ADH secretionarrow_forward
- Describe the renin-angiotensin-aldosterone (RAA) system. a. The hormones that compose it. b. What does each hormone do. c. Where are they synthesized and converted. d. What is the stimulus to activate the RAA system.arrow_forwardWhich is the correct answer for kidney from the following statement(s)? Local production of prostaglandin in kidney protects kidney from ischemic injury. a. Sympathetic stimulation has no effect on afferent and efferent arterioles so that kidney is protected from undergoing ischemia. b. Kidney is vulnerable to ischemic injury. C. d. NSAID inhibits production of angiotensin I. Only (a) and (c) are CORRECT e.arrow_forwardwhen atrial natriuretic peptide is injected into an experimental animal, which of the following is an acute physiologic response? A. decreased blood pressure B. decreased heart rate C. increased renin release D.increased sodium and water reabsorption by the kidney . E, systemic vasoarrow_forward
- Indicate the hormone that is NOT regulating urine production. A. Aldosterone B. Erythropoietin C. Antidiuretic hormone D. Atrial natriuretic peptide Name the most abundant anions in the extracellular fluid (ECF). А. НРО В. C C. Mg* D. Karrow_forwardWhen a person is bleeding you worry more about the kidneys because: a.kidneys receive most of cardiac output. b.the kidney can tolerate any decrease in blood flow and we should not worry about this strong organ. c.a decrease in GFR may lead to irreversible renal damage d.any decrease in renal blood flow can lead to renal ischemia e.if renal blood flow is severely depressed arterial blood pressure might increase to very high values.arrow_forwardThe renal system responds to alkalosis by A. Increased secretion of hydrogen ions (H+) B. Decreased secretion of hydrogen ions (H+) C. Increased secretion of Sodium (Na+) D. Decreased secretion of Sodium (Na+)arrow_forward
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