Answer the following questions true (T) or false (F)
1. Vesicles known as melanosomes are taken into the cytosol of keratinocytes by endocytosis. The melanosome is transported to the superficial side of the keratinocyte to shield its nucleus.
2. Carotene and hemoglobin are two pigments that contribute to skin color in minor ways.
3. Hairs grow from cells in the matrix of the root that are still undergoing keratinization.
1. TRUE
2. TRUE
3. TRUE
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The functional unit of muscle contraction is
A. the muscle. B. the myosin cross-bridge. C. the muscle fiber. D. the sarcomere.
Hypertension means:
A) increased blood pressure B) increased pulse C) decreased pulse D) decreased blood pressure
Angiotensin II is a potent hormone that __________.
stimulates secretion of aldosterone by the adrenal cortex and epinephrine by the adrenal medulla causes constriction of the efferent arteriole at the nephron triggers the release of ADH in the CNS All of the listed responses are correct.
Which section of the nephron is sensitive to antidiuretic hormone?
A) distal convoluted tubule B) nephron loop C) collecting duct D) proximal convoluted tubule