Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 41, Problem 8TY
Summary Introduction
Introduction: The concentration of some solutes in the blood like minerals, glucose, and oxygen is not always constant; it changes with the environmental conditions. These variations are known as physiological variables. For example, blood glucose concentration increases just after a meal.
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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 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.
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.
Chapter 41 Solutions
Biology
Ch. 41.1 - Core Skill: Modeling The goal of this modeling...Ch. 41.1 - Prob. 2CSCh. 41.2 - Prob. 1CCCh. 41.3 - Core Skill: Connections Can negative feedback...Ch. 41.3 - What similar feedforward process might occur in an...Ch. 41.4 - Prob. 1CCCh. 41.4 - Prob. 2CCCh. 41.4 - Prob. 3CCCh. 41.4 - Prob. 4CCCh. 41.4 - What symptoms are sometimes seen in athletes after...
Ch. 41.4 - Prob. 2EQCh. 41.4 - Prob. 3EQCh. 41 - Prob. 1TYCh. 41 - Structures composed of two or more tissue types...Ch. 41 - Prob. 3TYCh. 41 - From an examination of the structure of many...Ch. 41 - Prob. 5TYCh. 41 - The folds, convolutions, or extensions found in...Ch. 41 - Prob. 7TYCh. 41 - Prob. 8TYCh. 41 - Prob. 9TYCh. 41 - Prob. 10TYCh. 41 - Prob. 1CQCh. 41 - Define homeostasis, and give examples of...Ch. 41 - Prob. 3CQCh. 41 - Prob. 1COQCh. 41 - Discuss the organization of animal bodies from the...
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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_forwardMark 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 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 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_forwardThe hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells. Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and the insulin-secreting cells. Therefore, which of the following statements is correct? A decrease in blood glucose concentration stimulates insulin secretion, which in turn further towers blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers blood glucose concentration. A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn further increases blood glucose concentration. None of the preceding is correct.arrow_forwardWhich of the following statements describe a characteristic of the human body? a. Under certain conditions your body’s resistance can be low as a few hundred ohms. b. The lower the resistance of your body, the more current that can be forced through it by a given amount of voltage. c. The resistance of your body is lower than the normal when you are wet. d. All of the above. EXPLAINarrow_forward
- The hormone aldosterone regulates blood pressure through: A. Reabsorption of sodium. B. Secretion of sodium C. Reabsorption of potassium D. Secretion of potassium E. Secretion of calcium Why does a hormone (for example, epinephrine) generate different reactions in different target cells (for example, in smooth muscle cells)? A. Because the reaction of the cell depends on the amount of the hormone. B. Because of the influence of environment on the cell; for example, body temperature. C. Because cells have different receptor proteins; say, α-and β-receptors. D. It depends on the circumstances; sometimes cell reacts one way, sometimes another. E It depends on the influence of other surrounding cells.arrow_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_forwardA 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_forward
- Sweating 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_forwardUsing your knowledge of the heart, blood vessels and factors affecting blood pressure, create a possible reflex control/feedback loop that would occur if a person's blood pressure suddenly decreases. Include all of the elements of a feedback loop. Your answer can simply be a list of steps that would occur, but make sure to indicate all of the elements of a feedback loop. This does not to be extremely detailed, I am looking for the elements of the feedback loop and to see that you understand the factors affecting blood pressure. I will start the loop: 1. Stimulus: Drop in blood pressure.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_forward
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