Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 21, Problem 3SQ
Summary Introduction
Introduction: Homeostasis is the maintenance of an internal balance. The animal body is made up of several organs that should perform their function in unison. Homeostasis is the maintenance of the body condition where internal environment is maintained in a constant state even if there is a significant change in the external environment. The body has several mechanisms to maintain the homeostasis.
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which 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 properly
which 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.
Which of the following statements is True?a. Ectotherms generate most of their body heatmetabolically.b. Ectotherms include birds and mammals.c. Ectotherms experience variable body temperatures.d. Ectotherms are known as “warm-blooded” animals.
Chapter 21 Solutions
Campbell Essential Biology with Physiology (6th Edition)
Ch. 21 - Which is likely to be a more common cancer in an...Ch. 21 - Prob. 2SQCh. 21 - Prob. 3SQCh. 21 - Prob. 4SQCh. 21 - State whether each statement below is an example...Ch. 21 - While visiting a farm on a hot summer day, you see...Ch. 21 - Prob. 7SQCh. 21 - Prob. 8SQCh. 21 - What happens to most of the water that passes from...Ch. 21 - Explain the similarities between how your body...
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- Which of the following is not a way that ectotherms can change their body temperatures? a. Sweating for evaporative cooling. b. Adjusting the timing of their daily activities. c. Seek out or avoid direct sunlight. d. Huddle in a group.arrow_forwardWhich internal factor must be monitored and adjusted to maintain homeostasis?a. blood pressure b. internal temperature c. blood pH d. all of the abovearrow_forwardWhich internal factor must be monitored and adjusted to maintain homeostasis? a. blood pressure b. internal temperature c. blood pH d. all of the abovearrow_forward
- Which of the following is an example of negative feedback? A. High blood sugar will increase the viscosity of blood plasma (plasma is concentrated). In response, water is drawn into the plasma from surrounding tissues in order to dilute the plasma B. Breathing rate increases during exercise to provide more oxygen to muscle cells. Heart rate also increase to increase the speed at which the oxygen is delivered. C. During digestion cells in the stomach produce HCl to begin breaking down proteins, the HCl then stimulates the release of pepsin, to continue breaking down proteins. D. In the immune system, antibodies produced by B-cells bind to antigens, which activates other B-cells to produce antibodies of the same kind.arrow_forwardThe process of monitoring and adjusting of the body’s condition, such as temperature and pH, is known asa. exothermy.b. homeostasis.c. osmoregulation.d. ectothermy.arrow_forwardWhich of the following is NOT a mechanism to maintain the body’s internal temperature? A. Fluid has a high capacity for heat, so it requires a great deal of energy to raise its temperature. B. Warmed fluids from the body’s surface return to the body’s core, thus heating the body. C. Fluid acts as a coolant by increasing the blood flow from the warm body core to the peripheral tissue, thus cooling the body. D. Fluid is evaporated as sweat from the skin’s surface, thus cooling the body.arrow_forward
- 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.arrow_forwardWhat is an example of an accurate representation of the level or organization of the body, from smallest to largest? A. Lung, tissue, oxygen atom, O2 cells, lungs B. Carbon atom, blood cell, heart tissue, heart C. White blood cell, hydrogen atom, immune system, glands. D. Iron atom, nervous tissue, brain, brain cellsarrow_forwardWhich of the following physiological event is not maintained by homeostasis? Select one: a. Temperature of the body. b. Blood pressure. c. Concentration of oxygen in the body. d. Concentration of nutrients in the body.arrow_forward
- Which of the following are examples of maintaining homeostasis (more than one answer may be correct)? a. You develop diarrhea in response to contracting norovirus b. Sweating due to eating spicy food c. Kidneys removing excess fluid through urine d. Insulin is released in response to high blood sugar, causing cells to use more sugararrow_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_forwardPositive feedback mechanisms to drive homeostasis are more common than negative feedback mechanisms. A. True B. False Cholesterol is a waxy, organic substance found in body cells and in blood. The human body uses cholesterol to make cell membranes, vitamin D, hormones, and bile (a liver product). There are two major types of cholesterol, both produced by the liver. What is the typical path that dietary cholesterol (cholesterol we get from food) takes through the digestive system, from the mouth to where it is absorbed into the bloodstream? A. Mouth → Esophagus → Pharynx B. Mouth → Pharynx → Esophagus → Small intestine → Stomach С. Mouth — D. Mouth Small intestine → Stomach → Stomach –→ Small intestine > Pharynx Pharynx → Esophagus → Esophagus - → Stomach Small intestinearrow_forward
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