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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Textbook Question
Chapter 21, Problem 5SQ
State whether each statement below is an example of positive or negative feedback and why.
- a. Stimulation of a nerve cell causes sodium ions to leak into the cell, and the sodium influx triggers the inward leaking of even more sodium.
- b. An increase in the concentration of glucose in the blood stimulates the pancreas to secrete insulin, a hormone that lowers blood glucose concentrations.
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ndicate whether each of the following statements is true or false. If false, correct the statement or provide a briefexplanation for why it is false.a. Insulin increases the rate of glucose uptake by the tissues.b. Glucagon is the hormone that signals low blood glucose levels.c. The muscles can use glucose, fatty acids and ketone bodies for fuel.d. Epinephrine stimulates breakdown of glycogen in muscles when there is an immediate needfor energy by muscle cells.e. Glucagon stimulates glycogenolysis to maintain the blood glucose concentration.f. With high [carbohydrate] levels, excess glucose (after glycogen storage has reached amaximum) is converted to fat.g. The high potential electrons of NADH enter the respiratory chain at NADH-Q reductase.h. Ubiquinol (QH2) is also the entry point for electrons from NADH of flavoproteins.i. Cytochrome reductase catalyzes the transfer of electrons from cytochrome c to O2.
Hyponatremia is a condition that occurs when the level of sodium ions in the blood is severely low. This condition can occur in endurance sports such as ultra running. One cause of hyponatremia is when athletes consume too much water.The hormone that is secreted by the body to increase the absorption of sodium ions and the gland that secretes it are, respectively:
Select one:
a.
Hormone
Gland
Aldosterone
Adrenal cortex
b.
Hormone
Gland
ADH
Posterior pituitary
c.
Hormone
Gland
ADH
Adrenal cortex
d.
Hormone
Gland
Aldosterone
Posterior pituitary
A group of students are participating in a 24-hour fast to raise money for the foodbank. Fasting refers to refraining from eating for a period of time. Select the answer that describes how the students’ bodies would respond to maintain homeostasis.
Select one:
a. The beta cells of the islets of Langerhans are producing glucagon to decrease blood glucose levels.
b. The alpha cells of the islets of Langerhans are producing insulin to increase blood sugar levels.
c. The alpha cells of the islets of Langerhans are producing glucagon to increase blood glucose levels.
d. The beta cells of the islets of Langerhans are producing insulin to decrease blood sugar levels.
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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- Hormone X appears to regulate the blood concentration of chemical Y via a negative feedback loop. a. Predict what happens to the secretion of hormone X when the blood concentration of chemical Y decreases. b. What effect will this likely have on the blood concentration of chemical Y?c. Predict what happens to the secretion of hormone X when the blood concentration of chemical Y increases.arrow_forwardDescribe how blood sugar (e.g. glucose plasma concentration) is regulated with the hormones, insulin, and glucagon. For this feedback loop, identify the following components of the feedback loop: stimulus, receptor, control center, efferent pathway, effector, and response. Be comfortable with this feedback loop to be able to describe the effects of changing various components of the feedback loop.arrow_forwardIn the answer, discuss insulin and glucagon. (You do not need to talk about the other hormones that influence glucose levels when stress levels are high.) For each hormone, state the stimuli that causes secretion, the cell that secretes the hormone, the metabolic pathways stimulated by the hormone and the overall effect of each hormone.arrow_forward
- An elderly gentleman has recently been diagnosed with cirrhosis of the liver. He admits to being a heavy drinker. This man is your patient. Given the damage to his liver, you would have concerns about all of the following except a. regulating his ability to maintain body temperature, because of decreased thyroid hormone levels. b. internal bleeding, because he has impaired ability to synthesize clotting proteins. c. edema, because of impaired synthesis of plasma proteins (e.g., albumin). d. jaundice, because his liver is less efficient at removing bilirubin from the blood.arrow_forwardPositive feedback mechanisms are beneficial, but they need to be controlled. Discuss a scenario where if positive feedback was allowed to continue, the body might get damaged.arrow_forwardA hydrophilic peptide hormone is produced in the anterior pituitary gland located at the base of the brain. The hormone targets specific cells in many parts of the body. Which of the following best explains a possible mechanism that would enable the hormone to efficiently reach all the target cells in the body? A. Restate the question and record the right answer. B. Why is this the correct answer?arrow_forward
- In an emergency situation, fluids are given intravenously to a patient. The fluids increase the blood volume. Increasing the blood volume can help to increase the patient’s blood pressure.A hormone in the body that increases blood pressure and the mechanism it uses to do this are, respectively Select one: a. Hormone Mechanism ADH Increases water absorption in the kidneys b. Hormone Mechanism Oxytocin Increases smooth muscle contractions c. Hormone Mechanism ADH Decreases water absorption in the kidneys d. Hormone Mechanism Oxytocin Decreases smooth muscle contractionsarrow_forwardThyroid hormone is the primary hormone that regulates body temperature. It does so by a. stimulating muscle contraction. b. increasing the number of Na+/K+ pumps in neurons. c. vasoconstriction of peripheral blood vessels. d. sweating.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_forward
- 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.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 statements describe how systems interact to produce the fight-or-flight response?Select the two correct answers. A The digestive system interacts with the excretory system, supplying hormones to slow the production of urine. B The endocrine system floods the circulatory system with hormones that affect several other body systems. C The endocrine system supplies the lungs with insulin, allowing increased absorption of oxygen. D The digestive system creates hormones that are sent to the muscular system, resulting in increased blood flow to muscles. E The muscular system sends receptors to the circulatory system to increase blood pressure and heart rate. F The circulatory system experiences a change in blood flow, which allows the muscular system to obtain additional glucose.arrow_forward
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