Which is a change in the digestive system associated with aging?
A. Thinning of the tunica muscularis
B. Decreased enzyme secretion
C. Decreased replacement of epithelial cells
D. Decreased mucin secretion
E. All of the choices are correct.
Answer: E
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Using Figure 4.2, match the following:
1) Simple cuboidal epithelium.
2) Cardiac muscle.
3) Simple squamous epithelium.
4) Stratified squamous epithelium.
5) Skeletal muscle.
The structures that form the respiratory membrane include:
(1) elastic fibers (2) secondary bronchioles (3) the basement membrane of the alveolar epithelium (4) the pulmonary nerve plexus (5) capillary walls A) All of the answers are correct. B) None of the answers are correct. C) 2, 4 D) 3, 5 E) 2, 4, 5
After her last check-up, Harriet was informed that her active Vitamin D levels were low. Which of the following conditions may explain why this is so?
A. Melanin production has increased due to sun exposure, reducing Vitamin D activation. B. An increase in Vitamin D absorption at the intestines has overwhelmed the homeostasis of vitamin production at the kidneys. C. Liver dysfunction has reduced the conversion of cholecalciferol to the intermediate for calcitriol production.
Read about the gray crescent in your textbook. How does its location relate to the site of sperm penetration?
What will be an ideal response?