Exercise can significantly slow the rate of senescence of many organ systems. TR

Question

Exercise can significantly slow the rate of senescence of many organ systems. TRUE or FALSE

How does the egg prevent polyspermy?

A. Production of antibodies against additional sperm

B. Two of the above prevent polyspermy.

C. Phagocytosis of additional sperm

D. Depolarization of the egg membrane

E. None of the above prevent polyspermy.

During development, the embryo folds around the yolk sac to become cylindrical in shape. TRUE or FALSE

Which of the following are true regarding evolution and senescence?

A. Genes that contribute to senescence are usually past reproductive age.
B. Natural selection eliminates genes that contribute to senescence.
C. Natural selection works by eliminating genes that decrease human life span.
D. Given enough time, a gene that negatively impacts the ability for an individual to reproduce may be slowly eliminated in a population.
E. Two of the statements above are correct.

How does exercise affect senescence?

A. Maintains endurance

B. Reduces hypertension

C. Decreases joint mobility

D. Increased probability of diabetes mellitus

E. Two of the above affect senescence.

Explanation / Answer

Ans1. True.

A person who exercises regularly has more immunity and strength which slows down senescence of organs.

Ans2. (E) None of the above prevent polyspermy.

Polyspermy is prevented by the modification of extracellular coat of the egg.

Ans3. True.

The developing embryo folds around yolk sac to form cylindrical shape.

Ans4. (E) Two of the above statement are correct.

Ans5. (E) Two of the above affect senescence.

Exercise reduces hypertension and maintains endurance.

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