What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 25, Problem 3MC
Summary Introduction
Introduction:
Hormones are a chemical means by which the organism controls its various activities.
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Which of the following is not an accuratestatement?(A) Hormones are chemical messengers that travelto target cells through the circulatory system.(B) Hormones often regulate homeostasisthrough antagonistic functions.(C) Hormones of the same chemical class usually have thesame function.(D) Hormones are often regulated through feedback loops
A hormone differs from a neurotransmitter in thata. hormones act extracellularly, whereas neurotransmitters act withinthe cell that synthesized them.b. hormones are released only by neurons, whereas neurotransmittersare released by many different types of cells.c. hormones cause only fast responses (seconds or less) to stimuli,whereas neurotransmitters cause slow responses (minutes to hours)to stimuli.d. hormones affect only epithelial cells, whereas neurotransmittersaffect only muscle cells.e. hormones are released into the bloodstream and can activate manycells in many parts of the body, whereas neurotransmitters arereleased by neurons and affect adjacent cells.
which of the following happens when a therapeutic synthetic hormone is introduced into the body to treat the patients natural hormone insufficiently? (select all that apply?
A. the target cells respond the same way as when the hormone is natural
B.the synthetic hormone has no effort on the target tissues
C the amount of natural hormone produced by patients body declines
D the syntheyic hormone is destroyed before it can have an effect on the target tissue.
Chapter 25 Solutions
What Is Life? A Guide to Biology with Physiology
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- What is the function of the hormone erythropoietin? a. stimulates production of red blood cells b. stimulates muscle growth c. causes the fight-or-flight response d. causes testosterone productionarrow_forwardResearchers measured prolactin and growth hormone in the blood plasma of six subjects at regular intervals over a 24-hour period. The investigators were interested in determining if the levels of these two hormones cycle over a 24-hour period. The Figure presents the results of their experiments, with the y axis values showing the amount of each hormone expressed as a percentage of the 24-hour mean value, and each point showing the average of the six subjects levels. FIGURE Mean concentrations of prolactin and growth hormone in plasma, averaged for six subjects and expressed as a percentage of the average concentrations measured for the 24-hour period. Do the results support the hypothesis that the changes in prolactin level over a 24-hour period are associated with the sleepwake cycle? Source: From J. F. Sassin et al. 1972. Human prolactin: 24-hour pattern with increased release during sleep. Science 177:12051207.arrow_forwardUnlike the nervous system, the endocrine systema. uses chemical signals as a means of communication.b. helps maintain equilibrium.c. sends messages to target organs.d. changes the metabolism of cells.arrow_forward
- Which of the following observations can be explained by the properties of hormone receptors? a) A certain tissue can react to more than one hormone b) A certain hormone affects only a specific tissue, not all tissues c) Some tissues react very quickly to a certain hormone, other tissues take many hours to react to the same hormonearrow_forwardwhich of the following happens when a therapeutic synthetic homone is introduced intno the body to treat patients natural hormone insufficiency?(select all that apply) A. The target cell responds the same way as when the hormone is natural B. the synthetic hormone has no effect on the target tissues C. the amount of natural hormone produced by the patients body declines D. the synthetic hormone is destroyed before it can have an effect on the target tissue.arrow_forwardWhich of the following statements about hormones is not correct? A. The persistance of a hormone in the blood is usually of short duration.B. The time required for the onset of hormonal effects can vary C. Organ responses to hormones occur as soon as receptors are bound. D. The duration of hormone action is variable.arrow_forward
- Which of the following statements is true about diabetes? a. It can only be inherited. b. Very few people in the world get the condition. c. It is a result of a mismatch between our evolved bodies and our modern lifestyle. d. Once a person is diagnosed with diabetes, the condition rarely progresses.arrow_forwardWhich of the following is an important function of the endocrine system? a. Provides mechanisms for rapid response to changes in the body b. Provides mechanisms that control the nervous system c. It inhibits nervous system action on muscles and glands d. It maintains a contant yet dynamic internal fluid environmentarrow_forwardWhich of the following best describes hormones? a. Hormones are relatively unstable and work only in the area adjacent to the gland that produced them. b. Hormones are long-lasting chemicals released from glands. c. All hormones are lipid-soluble. d. Hormones are chemical messengers that are released into the environment.arrow_forward
- Recent studies suggest that blue light exposure can impact human circadian rhythms. This suggests that blue light disrupts the function of the _____ gland(s). a. adrenal b. pituitary c. pineal d. thyroidarrow_forwardWhat are the difference and similarities of Endocrine system in animals and plants?arrow_forwardFunctions of hormones include which of the following? a. control rates of certain chemical reactions b. transport substances across cell membranes c. help regulate water and electrolyte balances d. all of the abovearrow_forward
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