Of the changes listed below, which is associated with aging of the digestive system?
A. Increased saliva production
B. Increased perception of flavor intensity
C. Increased production of stomach acid
D. Decreased production of intrinsic factor and less efficient absorption of vitamin B12
E. Increased intestinal absorption of iron and calcium
D. Decreased production of intrinsic factor and less efficient absorption of vitamin B12
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_________ are small channels that allow materials to pass from one epithelial cell to another.
A) Tight junctions B) Gap junctions C) Desmosomes D) Hemidesmosomes
Which of the following nitrogen bases is found in RNA but not DNA?
A. Adenine B. Uracil C. Thymine D. Guanine E. Cytosine
During defecation, we hold our breath, bear down, and strain. Explain the effects of holding one's breath on blood pressure
What will be an ideal response?
Eskimos wear a great deal of clothing and have limited exposure to U.V. light, but do not suffer from vitamin D deficiency. A possible explanation is,
A. their exposure to U.V. light in the summer will last for a year. B. they do not need vitamin D. C. their bodies produce vitamin D another way. D. they get enough vitamin D in their diet of fish and marine mammals. E. they do not require sunlight for vitamin D formation.