MasteringBiology With eText - Access
7th Edition
ISBN: 9780321911940
Author: Johnson
Publisher: PEARSON
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Chapter 21, Problem 14TY
Summary Introduction
Introduction:
Aging is a process where the body undergoes changes with the passage of time. There are three theories/hypothesis on the causes of aging. First describes that there is some type of internally situated genetically determined program that determines the cell’s death timing. The second one describes that if there is a high accumulation of damaged cells in the body then it eventually leads to limiting the capability of the cell of repairing them. The third describes the decline of the function of one’s body system can cause a decline in the other one due to the interdependency of the organ system in the complex organism.
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Chapter 21 Solutions
MasteringBiology With eText - Access
Ch. 21 - Prob. 1QCCh. 21 - Prob. 2QCCh. 21 -
1. Why does only one sperm fertilize the egg, and...Ch. 21 - Prob. 2CRCh. 21 - Prob. 3CRCh. 21 - Describe the stages of labor and delivery.Ch. 21 - What causes the newborn to take its first breath...Ch. 21 - Prob. 6CRCh. 21 - What causes the onset of puberty (sexual...Ch. 21 - Summarize the three main hypotheses of the causes...
Ch. 21 - Prob. 9CRCh. 21 - Prob. 10CRCh. 21 - Which of the following lists the correct order of...Ch. 21 - Which of the following will result in fraternal...Ch. 21 -
3. Which of the following processes is the first...Ch. 21 - Prob. 4TYCh. 21 - Prob. 5TYCh. 21 - Prob. 6TYCh. 21 -
7. Which of the following is mismatched?
a....Ch. 21 - Prob. 8TYCh. 21 - Prob. 9TYCh. 21 -
10. Which of the following would be detrimental...Ch. 21 - Prob. 11TYCh. 21 - Prob. 12TYCh. 21 - Prob. 13TYCh. 21 - Prob. 14TYCh. 21 - Which hormone plays a critical role both in...Ch. 21 - Prob. 1AWKCh. 21 - Prob. 2AWKCh. 21 - Prob. 3AWKCh. 21 - Each year, it is estimated that over 40,000...Ch. 21 - Prob. 5AWKCh. 21 - Prob. 6AWKCh. 21 - How is it possible that one's life could be...
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- Compare and contrast four theories of why aging occurs.arrow_forwardWhat environmental factors influence the rate of aging?arrow_forwardOf the following choices, which is most likely to reduce the risk of a fractured bone in an older person? Question 74 options: a) Hormone replacement therapy in post-menopausal women b) Eating plenty of calcium-containing foods as a teenager c) Ensuring adequate exposure to the sun d) Eating plenty of eggs and dairy foods after the age of 50arrow_forward
- A biological hormone feedback system causes puberty to begin. What occurs during this process? A. New sex hormones are introduced into the body. B. A part of the pituitary gland shuts down in preparation for puberty. C. Levels of preexisting hormones are increased to a higher setpoint. D. All of the above.arrow_forwardWhich of the following is associated with the aging process?a. reduction in the production of sex hormones, such as testosteroneb. increased chances of dehydrationc. decrease in bone densityd. decrease in the ability of the senses to detect stimulie. All of these are correct.arrow_forwardWhat are the major causes of aging at the cellular and physiological levels?arrow_forward
- Which of the following statements correctly describes the effects of increased testosterone? a. Increased levels of testosterone result in increased sperm production b. Increased levels of testosterone decreases the release of FSH and LH c. Increased levels of testosterone stimulates the release of GnRH d. Increased levels of testosterone stimulates the release of FSH and LH.arrow_forwardAll of the following are associated with hypothyroidism EXCEPT Select one: a. Weight gain and inability tolerate cold b. Decreased secretion of TRH and TSH c. Fatigue and slow heart rate d. Increased secretion of TRH and TSHarrow_forwardWhich of the following would most likely reduce levels of active estrogen to potentially modulate cancer risk? a) Increased alcohol consumption b) Increased dietary folate c) Decreased levels of sex-hormone-binding globulin d) Increased phytoestrogen intakesarrow_forward
- Which of the following does NOT increase cortisol? A.sleep-deprivation B.stressors C.inflammation D.exercisearrow_forwardHow can the AGE process be improved?arrow_forwardEstradiol is found in high levels in the pregnant rat. This estradiol is prevented from affecting the development of the fetus because: a. it is chemically converted to testosterone, which does not affect the fetus b. it is bound by alpha-fetoprotein c. the blood-brain barrier keeps estrogens like estradiol out of the brain d. the fetus does not possess the estrogen receptors needed to respond to the estradiolarrow_forward
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