Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 32, Problem 3MC
Summary Introduction
Introduction:
Cells require a constant environment for their optimum activity. Any change in the surrounding has an adverse effect on the cellular
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In a negative feedback mechanism,a. the output cancels the input.b. there is a fluctuation above and below the average.c. there is self-regulation.d. a regulatory center communicates with other body parts.e. All of these are correct.
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.
Match 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.
Temperature
Chapter 32 Solutions
Biology
Ch. 32.1 - Prob. 1CSCCh. 32.1 - Prob. 1HYEWCh. 32.1 - What would happen if a cold, shvering mammal...Ch. 32.1 - Prob. 2CSCCh. 32.1 - define homeostasis and explain why organisms...Ch. 32.1 - explain the difference between ectotherms and...Ch. 32.1 - Prob. 3CYLCh. 32.1 - Prob. 4CYLCh. 32.2 - By pumping carbon dioxide and other greenhouse...Ch. 32.2 - Prob. 1TC
Ch. 32.2 - Prob. 1CYLCh. 32.2 - describe the four types of tissues?Ch. 32.2 - name and describe the major human organ systems?Ch. 32.2 - Prob. 2CTCh. 32 - Which of the following statements is False? a....Ch. 32 - Prob. 2MCCh. 32 - Prob. 3MCCh. 32 - Prob. 4MCCh. 32 - Which of the following statements is True? a....Ch. 32 - The ability of the body to maintain its internal...Ch. 32 - Prob. 2FIBCh. 32 - Prob. 3FIBCh. 32 - Glands with ducts connecting them to the...Ch. 32 - Prob. 5FIBCh. 32 - Define homeostasis, and explain how negative...Ch. 32 - Define and compare ectotherms and endotherms....Ch. 32 - Prob. 3RQCh. 32 - Prob. 4RQCh. 32 - Prob. 5RQCh. 32 - what property distinguishes connective tissue from...Ch. 32 - Prob. 7RQCh. 32 - Prob. 8RQCh. 32 - Why does life on land present particular...Ch. 32 - Prob. 2ACCh. 32 - Imagine you are a health care professional...
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- Which of the following is not true for f negative feedback loops? A. In a negative loop, the response to the signal or stimulus decreases the original signal or stimulus. B. Negative feedback loops maintain homeostasis. C. Negative feedback loops are temporary. D. There are many more instances of negative feedback loops in the human body than positive feedback loops.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_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_forward
- Which 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_forwardSweating is an example of variable. It is also an example of negative feedback mechanism. a. Both statements are true b. Both statements are false c. First is true, Second is false d. First is false, Second is truearrow_forwardWhich 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_forward
- 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 bodyarrow_forwardWhich of the following physiologlcal responses is an example of positive feedback? . The body's production of red blood cells, which transport oxygen from the lungs to other organs, is stimulated by low concentrations of oxygen. b. A high concentration of glucose in the blood causes deeper, more rapid breathing, which expels carbon dioxide. C. Pressure of the baby's head near the opening of the uterus stimulates uterine contractions which cause greater pressure against the uterine opening. d. Heightened body temperature induces sweating which disposes of metabolic heat and cools the body.arrow_forwardIn a negative feedback loop, the effector produces changes that are a. in the same direction as the change produced by the initial stimulus. b. opposite in direction to the change produced by the initial stimulus. c. unrelated to the initial stimulus.arrow_forward
- A male has lost blood as a result of a gunshot wound. Even though thebleeding has been stopped, his blood pressure is low and dropping,and his heart rate is elevated. Following a blood transfusion, his bloodpressure increases and his heart rate decreases. Which of the following statement(s) is (are) consistent with these observations?a. Negative-feedback mechanisms can be inadequate without medical intervention.b. The transfusion interrupted a positive-feedback mechanism.c. The increased heart rate after the gunshot wound and before thetransfusion is a result of a positive-feedback mechanism.d. a and be. a, b, and carrow_forwardwhich of the following scenarios can be classified as a negative feedback loop? a. increase in oxytocin caused by increased contractions b. increase in blood pressure to reduce heart rate c. increase in testosterone to help increase a fight or flight response d. increase in platelet production to help increase blood clottingarrow_forwardWhich of the following is a way that the body determines how much of a certain chemical, protein, enzyme, or response is needed to maintain homeostasis? A. Resource limitation, B. Feedback inhibition, C. Kickback inhibition, D. Signal looparrow_forward
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What is Homeostasis? | Physiology | Biology | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=quQr6X1Q58I;License: CC-BY