Check all of the major hypotheses of aging.
A. Damage to mitochondria
B. Presence of a "cell death clock"
C. Damage to lysosomes
D. Damage to the DNA from free radicals
E. Presence of "death genes"
Ans:
A. Damage to mitochondria
B. Presence of a "cell death clock"
D. Damage to the DNA from free radicals
E. Presence of "death genes"
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A) chemoreceptors B) nociceptors C) proprioceptors D) thermoreceptors E) photoreceptors
Sperm move to the uterine tube through uterine contractions and the energy of their own flagella. What other factor is involved in sperm movement?
A) reverse peristalsis of the uterus and uterine tubes B) the cilia on the apex of the cells lining the endometrium C) hormonal attraction to the ova D) the increased temperature in the vagina, which stimulates sperm motility
Which of the following contains only Y chromosome?
a. A sperm b. A body cell in female c. A body cell in male
Mucous connective tissue is found only in
A. the umbilical cord. B. certain bones of the skull. C. serous fluid. D. the cartilage of the nose. E. fibers of the respiratory system.