BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Deficient water levels in humans are prevented by:

a. osmoreceptors in the hypothalamus that detect decreases insalt concentrations.

b. the hypothalamus stimulating the posterior pituitary tosecrete a hormone that allows the collecting ducts and distalconvoluted tubules to be permeable to water.

c. inhibiting ADH, which causes a rise in osmolarity of the ECF.

d. producing dilute urine.

e. drinking alcohol, which stimulates aldosterone to raise theosmolarity of body fluids.

Summary Introduction

Introduction:

Vasopressin or the antidiuretic hormone (ADH) is synthesized in hypothalamus from a prohormone. Then, it gets released from the vesicles in the circulation in response to the hypertonicity of extracellular fluids.

Explanation

Justification for the correct answer:

Option (b) states that low water levels in humans are prevented by hypothalamus, which stimulates the posterior pituitary to secrete a hormone that allows the collecting ducts and DCT to become permeable to water. The control hubs of the hypothalamus, which adjust the antidiuretic hormone (ADH) secretion and thirst, act together. This refers that both the secretion of ADH and thirst are activated by the bodily water shortage and also by the excess of water in the body. Similar condition, which decreases the urinary output to save water also lead to thirst sensation to restore water levels in body. Hence, the option (c) is correct.

Justification for the incorrect answers:

Option (a) states that low water levels in humans are prevented by osmoreceptors in the hypothalamus that detects decrease in the salt concentrations. This is false as osmoreceptors in the hypothalamus that is present near the cells secrete antidiuretic hormone and the thirst centers observe the control of secretion of ADH. When osmoreceptors detect the rise in the osmolarity, the requirement to preserve water rises, and both the secretion of ADH and the thirst get activated...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Which of the fol lowing have been associated with an increase in cancer risk? a. alcohol intake b. high intakes...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

A standing wave is described by the wave function y=6sin(2x)cos(100t) where x and y are in meters and t is in s...

Physics for Scientists and Engineers, Technology Update (No access codes included)