Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 32, Problem 4TYU
Homeostasis typically relies on negative feedback because positive feedback
- A. requires a response but not a stimulus.
- B. drives processes to completion rather than to a balance point.
- C. acts within, but not beyond, a normal range.
- D. can decrease but not increase a variable.
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Which of these statements about homeostasis is true? a.The internal environment is maintained absolutely constant. b.Negative feedback mechanisms act to correct deviations from a normal range within the internal environment. c.Homeostasis is maintained by turning effectors on and off. d.All of these are true.
Mark the following statements as true or
false. If a statement is false, correct it to
make a true statement.
a. Structure and function are closely
related at the organ level only.
b. Homeostasis is the condition of having a
dynamic equilibrium of the internal
environment.
c. Positive feedback loops are triggered by
a deviation from a homeostatic set point
and are shut down when conditions return
to the set point.
d. The effects of negative feedback loops
are amplified to create an escalating
response.
e. Cell-cell communication is required to
coordinate the activities of the whole body
Which of the following is the correct definition of positive feedback?
a
The process by which the body neglects homeostasis.
b
A mechanism in which the body's response to a stimulis opposes the stimulus.
c
A mechanism whereby the body responds to a stimulus by acting to enhance the stimulus
d
The dynamic equilibrium maintained by an integrating center which causes an effector to respond to the stimulus received by the receptor.
Chapter 32 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 32.1 - What properties do all types of epithelia share?Ch. 32.1 - Prob. 2CCCh. 32.2 - Prob. 1CCCh. 32.2 - Prob. 2CCCh. 32.2 - Prob. 3CCCh. 32.3 - Is it accurate to define homeostasis as a constant...Ch. 32.3 - Prob. 2CCCh. 32.3 - Prob. 3CCCh. 32.4 - What is the function of the filtration step in...Ch. 32.4 - What advantage does uric acid offer as a...
Ch. 32.4 - WHAT IF? A camel standing in the sun requires much...Ch. 32.5 - Prob. 1CCCh. 32.5 - Prob. 2CCCh. 32.5 - WHAT IF? If blood pressure in the afferent...Ch. 32 - The body tissue that consists largely of material...Ch. 32 - Prob. 2TYUCh. 32 - Which process in the nephron is least selective?...Ch. 32 - Homeostasis typically relies on negative feedback...Ch. 32 - Prob. 5TYUCh. 32 - In which of the following species should natural...Ch. 32 - Prob. 7TYUCh. 32 - Prob. 8TYUCh. 32 - Prob. 9TYUCh. 32 - Prob. 10TYUCh. 32 - FOCUS ON ORGANIZATION In a short essay (100-150...Ch. 32 - SYNTHESIZE YOUR KNOWLEDGE These macaques (Macaca...
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- Homeostasis a. is a dynamic process. b. describes the maintenance of the internal environment of the body. c. is essential to life. d. All of the choices are correct.arrow_forwardIn negative feedback,a. a change causes responses that counteract the change.b. a response to a change damages the body.c. a change produces a response that enhances the change.d. a response to a change permanently alters the body.arrow_forwardwhich of the following situations illustrates that a homeostatic mechanism is not operating properly? a. acute high blood pressure b. normalized blood glucose levels c. dailt fluid intake equals dailty fluid output d. all of these illustrate homestatic mechanisms operating properlyarrow_forward
- Which of the following is incorrect?a. Equilibrium requires a constant input of energy.b. Positive feedback is less common in nature than negative feedback.c. Homeostasis does not imply that a given variable is unchanging.d. Fever is an example of resetting a set point.e. Efferent pathways carry information away from the integrating center of a reflex arc.arrow_forwardWhich of the following statement(s) about homeostasis is incorrect? a. it is a dynamic state of equilibriumb. despite continuous external changes, it maintains a relatively stable internal environmentc. controlled by nervous and endocrine systems via nerve impulses and hormones, respectivelyd. all of the abovee. none of the abovearrow_forwardMatch the body temperature control item to the appropriate location in the negative feedback loop. Effector when variable is low Effector when variable is high Control center Sensor Controlled variable A. Muscles for shivering and goosebumps B. Nerves in skin C. Brain D. Sweat glands E. Temperaturearrow_forward
- Homeostasis involves maintaining Select one: a. body conditions outside the normal range b. a relatively constant internal environment in the body c. the external environment to accommodate the body's needs d. the body in a fixed, unchanging statearrow_forwardWhich of the following is true of positive feedback? a. The change is opposite that of negative feedback b. The effector turns off the response c. The change is amplified What is the difference between the answers a & b?arrow_forwardIn negative feedback, the variable being regulated is changed in the ______ direction, while in positive feedback the variable is changed in the ______ direction. A. same, opposite B. negative, positive C. opposite, same D. decreasing, increasingarrow_forward
- Homeostasis maintains the body’s internal conditions within a narrow range.a. Trueb. Falsearrow_forwardwhich of the following statements are true about homeostasis? Select all that apply. a. The selective permeability of the cell membrane allows for thermoregulation. b. Homeostasis is an organism‘s way of maintaining constant and balanced internal processes. c. Ectotherms rely on environmental heat to maintain homeostasis. d. Homeostasis works by a system of positive feedback.arrow_forwarda positive-feedback system is one in which a. a variable is charged in the opposite direction to the original change that initiated the system b. a variable is changed in the same direction as the original change that initiated the system c. two opposiding variables are played against each other d. the initiating variable is always increasedarrow_forward
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