Author Question: Normal aging of the cardiovascular system includes a. Strengthened heart contractions b. ... (Read 101 times)

nummyann · **on:** Jul 11, 2018

Normal aging of the cardiovascular system includes

a. Strengthened heart contractions
b. Decreased cardiac output
c. Flaccid and thinned heart valves
d. Dilation of blood vessels

Question 2

Physiological theories of aging focus on all of the following except

a. Genetics
b. Nutrition
c. Wear and tear of the body
d. Personality

nikmaaacs · **Reply #1 on:** Jul 11, 2018

Answer to Question 1

B
Cardiac output is decreased as a result of the slowed heart rate and weaker cardiac contractions. This is not usually a noticeable problem unless older persons are exposed to stressors that exceed their reserves. Responses A, C, and D are incorrect. The aging heart is slower and weaker, the valves become thickened and more rigid, and blood vessels thicken and become less elastic.

Answer to Question 2

D
One physiological theory of aging focuses on genetics, stating that people are born with a genetic program that predetermines life span. Another focuses on a person's nutrition during his or her life span, and yet another focuses on the fact that all fine-tuned machineryand that includes body partswear out or become less effective as they are repeatedly used. Response Dpersonalityis incorrect because it does not relate directly to a physiological factor.