Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 33, Problem 2VCQ
Figure 33.21 State whether each of the following processes are regulated by a positive feedback loop or a negative feedback loop.
- A person feels satiated after eating a large meal.
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Which of the following examples DOES NOT involve negative feedback regulation?
Regulation of blood clotting
Regulation of calcium concentration
Regulation of electrolyte concentration
Regulation of blood glucose concentration
An example of feedback is seen in blood clotting. Part of the complex biochemical pathway of clotting is the production of an enzyme that forms the
matrix of the blood clot, but also speeds up the production of still more thrombin. That is, it has a self-catalytic, self-accelerating effect, so that once the
clotting process begins, it runs faster and faster until, ideally, bleeding stops. Thus, this positive feedback loop is part of a larger negative feedback loop,
one that is activated by bleeding and ultimately works to stop the bleeding.
So ultimately in keeping homeostasis, which of the following is true:
This is a positive feedback loop
This is a negative feedback loop
Which of the following is an example of a positive feedback loop?
Regulation of Calcium levels in the blood
Regulation of water balance
Regulation of blood sugar
Regulation of blood clotting
Chapter 33 Solutions
Biology 2e
Ch. 33 - Figure 33.11 Which of the following statements...Ch. 33 - Figure 33.21 State whether each of the following...Ch. 33 - Figure 33.23 When bacteria are destroyed by...Ch. 33 - Which type of animal maintains a constant internal...Ch. 33 - The symmetry found in animals that move swiftly is...Ch. 33 - What term describes the condition of a desert...Ch. 33 - A plane that divides an animal into equal right...Ch. 33 - A plane that divides an animal into dorsal and...Ch. 33 - The pleural cavity is a part of which cavity?...Ch. 33 - How could the increasing global temperature...
Ch. 33 - Although most animals are bilaterally symmetrical,...Ch. 33 - Which type of epithelial cell is best adapted to...Ch. 33 - Which type of epithelial cell is found in glands?...Ch. 33 - Which type of epithelial cell is found in the...Ch. 33 - Which type of connective tissue has the most...Ch. 33 - Which type of connective tissue has a mineralized...Ch. 33 - The cell found in bone that breaks it down is...Ch. 33 - The cell found in bone that makes the bone is...Ch. 33 - Plasma is the. fibers in blood matrix of blood...Ch. 33 - The type of muscle cell under voluntary control is...Ch. 33 - The part of a neuron that contains the nucleus is...Ch. 33 - Why are intercalated discs essential to the...Ch. 33 - When faced with a sudden drop in environmental...Ch. 33 - Which is an example of negative feedback? lowering...Ch. 33 - Which method of heat exchange occurs during direct...Ch. 33 - The body’s thermostat is located in the...Ch. 33 - Which of the following is not true about...Ch. 33 - Which of the following is not a way that...Ch. 33 - How does diffusion limit the size of an organism?...Ch. 33 - What is the relationship between BMR and body...Ch. 33 - Explain how using an open circulatory system...Ch. 33 - Describe one key environmental constraint for...Ch. 33 - How can squamous epithelia both facilitate...Ch. 33 - What are the similarities between cartilage and...Ch. 33 - Multiple sclerosis is a debilitating autoimmune...Ch. 33 - When a person leads a sedentary life his skeletal...Ch. 33 - Why are negative feedback loops used to control...Ch. 33 - Why is a fever a “good thing” during a bacterial...Ch. 33 - How is a condition such as diabetes a good example...Ch. 33 - On a molecular level, how can endotherms produce...
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- The diagram in Figure 5 shows the difference between negative feedback and positive feedback. (i)Explain why negative feedback is important in homeostasis. (ii)Explain how negative feedback enables the carotid and aortic bodies and the medulla to maintain a constant blood carbon dioxide level. (iii)It is said that the initiation of an Action Potential is an example of positive feedback. With reference to the process involved, state why you think this statement is accurate?arrow_forwardHuman body system is a powerful machine that works all the time. To maintain the system, homeostasis should function regularly. Give TWO (2) examples and discuss the factors that give effect to this selfregulating process.arrow_forwardWatch this video (http://openstaxcollege.org/l/dynamicfluid) to see an explanation of the dynamics offluid in the body’s compartments. What happens in tissueswhen capillary blood pressure is less than osmoticpressure?arrow_forward
- A patient is experiencing increased blood pressure. How would this effect the blood entering the glomerulus and on urination? an increase in filtration and increase in urine output a decrease in filtration and decrease in urine output an increase in filtration and decrease in urine output a decrease in filtration and increase in urine outputarrow_forwardShow how the nervous system coordinates and regulates feedback mechanism to maintain hemeostasis by creating a graphic organizer. Suppose a girl ate too many sweets such as chocolates. How will the hormones (insulin) from her pancreas help her body cope with a possible blood sugar level rise above normal?arrow_forwardWhich of the following statements about red blood cells is false? a. They live about 120 days before being replaced. b. They lack a nucleus and other organelles when they are mature. c. They are replaced when the hormone EPO stimulates stem cells in bone marrow. d. They are replaced as part of a negative feedback loop in which kidney cells monitor blood oxygen levels e. All the above statements are true except b, because all cells require a nucleus in order to function properly.arrow_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_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_forwardA doctor calls and states that all blood glucose results for his patients-from whom blood is drawn in his office and then sent to the laboratory are low blood glucose levels. The doctor says that there may be a problem with the laboratory instrument. What are you going to do to fix this dilemma and present your response to the doctor?arrow_forward
- In which of the following processes do the prostaglandinsnot have a major recognized role?a. reproductionb. blood clottingc. respirationd. inflammatione. blood pressure modificationarrow_forwardYour stomach starts grumbling during your Anatomy and Physiology lecture. As soon as class is over, you decide to hit the snack area. You see your favorite candy bar in one of the snack machines and you cannot resist. Your blood glucose level before eating this snack is 90mg/100ml (normal). As you digest and then absorb the sugar in the candy, the level of glucose in your blood increases to 120mg/100ml. The increased level of glucose is detected by receptors on pancreatic beta cells. These receptors send a signal into the beta cells, informing them of the excessive glucose in the blood. The pancreatic beta cells release insulin. The insulin travels through the blood and stimulates the liver and body cells. The liver andbodycellsremovetheextra glucosefromtheblood,reducingyourbloodglucosebackto its original level of 90mg/100ml. At this point, release of insulin stops.1. Whatisthestimulusofthiscontrolloop?2. Whatisthecontrolcenter?3. Whatistheeffector?4. In this feedback mechanism,…arrow_forwardA behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured. The blood pH drops as carbon dioxide is released into the bloodstream. Which component of the homeostatic feedback system is responsible for determining if the blood pH is far enough from normal that a response is necessary? Sensor Effector Assimilator Integratorarrow_forward
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