Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
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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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
In 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.
Which of these homeostatic mechanisms in the body are examplesof positive feedback, and which are examples of negative feedback?Why?a. The adrenal glands produce epinephrine in response to a hormone produced by the pituitary gland in times of stress; the pituitary gland senses the epinephrine in the blood and stopsproducing the hormone.b. As the bladder fills with urine, pressure sensors send messagesto the brain with increasing frequency, signaling that the bladdermust be emptied. The more the bladder fills, the more messagesare sent.c. When you drink an excess of water, specialized cells in yourbrain, as well as stretch receptors in your heart, detect theincrease in blood volume. Both signals are transmitted to thekidneys, which increase the production of urine.
Chapter 32 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 32.1 - Prob. 1CSCCh. 32.1 - define homeostasis and explain why organisms...Ch. 32.1 - Prob. 1HYEWCh. 32.1 - What would happen if a cold, shvering mammal...Ch. 32.1 - Prob. 2CSCCh. 32.1 - explain the difference between ectotherms and...Ch. 32.1 - Prob. 3CYLCh. 32.1 - Prob. 4CYLCh. 32.2 - Prob. 1CSRCh. 32.2 - By pumping carbon dioxide and other greenhouse...
Ch. 32.2 - Prob. 1CYLCh. 32.2 - Prob. 1ETCh. 32.2 - describe the four types of tissues?Ch. 32.2 - name and describe the major human organ systems?Ch. 32 - Why does life on land present particular...Ch. 32 - The ability of the body to maintain its internal...Ch. 32 - Which of the following statements is False? a....Ch. 32 - Define homeostasis, and explain how negative...Ch. 32 - Prob. 2ACCh. 32 - Prob. 2FIBCh. 32 - Prob. 2MCCh. 32 - Define and compare ectotherms and endotherms....Ch. 32 - Imagine you are a health care professional...Ch. 32 - Prob. 3FIBCh. 32 - Prob. 3MCCh. 32 - Prob. 3RQCh. 32 - Glands with ducts connecting them to the...Ch. 32 - Prob. 4MCCh. 32 - Prob. 4RQCh. 32 - Prob. 5FIBCh. 32 - Which of the following statements is True? a....Ch. 32 - Prob. 5RQCh. 32 - what property distinguishes connective tissue from...Ch. 32 - Prob. 7RQ
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- which 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_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
- When you open a pizza box, particles of the pizza enter the air around you, and enter your nose when you breathe in. Which of the following internal control systems is responsible for gathering information about the conditions inside and outside of the body? * A. Communicating system B. Control center C. Sensor D. Thalamus 2. Which of the following hormonal imbalance explains obesity among women? * A. Low level of estrogen weakens the bone. B. Excess levels of androgen make oil glands extra productive. C. Changing estrogen levels affecting serotonin or “happy hormone”. D. Decreasing estrogen level stimulates a craving for fatty, salty, and sweet foods.arrow_forwardSelect the statements that correctly describe positive feedback pathways. 1. A sensor/receptor is required to monitor and limit levels. 2. A sensor/receptor is unnecessary to monitor and limit levels. 3. Feedback prevents homeostasis. 4. Feedback contributes to homeostasis. 5. Feedback stimulates the effector to continue to do the same thing. 6. Feedback stops the effector from doing one thing and stimulates it to do the opposite. 7. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. 8. When a target level for a hormone is reached, feedback results in an increase of that hormone being released. Record your answers in ascending (lowest to highest) order.arrow_forwardWhich of the following mechanisms could both be used by the body to increase body temperature if a person forgets a coat on a cold day? A. Superficial blood vessels dilate, and the thyroid decreases metabolism. B. Superficial blood vessels constrict, and the thyroid decreases metabolism. C. Superficial blood vessels dilate, and the thyroid increases metabolism. D. Superficial blood vessels constrict, and the thyroid increases metabolism.arrow_forward
- . A self-amplifying chain of physiologicalevents is calleda. positive feedback.b. negative feedback.c. dynamic constancy.d. homeostasis.e. metabolism.arrow_forwardSelect the statements that correctly describe negative feedback pathways. 1. A sensor/receptor is required to monitor and limit levels. 2. A sensor/receptor is unnecessary to monitor and limit levels. 3. Feedback contributes to homeostasis. 4. Feedback prevents homeostasis. 5. Feedback stimulates the effector to continue to do the same thing. 6. Feedback stops the effector from doing one thing and stimulates it to do the opposite. 7. When the target level for a hormone is reached, feedback results in an increase of that hormone being released. 8. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. Record your answers in ascending (lowest to highest) order.arrow_forwardWhich of the following is an example of negative feedback? a The uterine contractions during childbirth push the baby's head against the cervix which stimulates the uterus to contract b The release of platelets that aggregate at the site of a blood vessel injury c "As blood sugar level rises, insulin is released which promotes the absorptiom of glucose from the blood by liver, muscle and fat cells" d None of the abovearrow_forward
- Which of these is an example of negative feedback?a. Air conditioning switches off when room temperature lowers.b. Insulin decreases blood sugar levels after eating a meal.c. Heart rate increases when blood pressure drops.d. All of these are examples of negative feedback.arrow_forwardWhich of the following statements regarding negative feedback is false?a. It helps regulate variables such as body temperature and bloodpressure.b. It is the mechanism by which birth occurs in mammals.c. It is a major feature of homeostatic control systems.d. It prevents homeostatic responses from overcompensating.e. It may occur at the organ, cellular, or molecular level.arrow_forwardgive two examples of feedback mechanisms in the human body. identify the type of feedback (negative or positive), the receptor, the control center and effector.arrow_forward
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