The epinephrine and norepinephrine released by the adrenal medullae
A) has a relatively long duration of activity because it may be inactivated by enzymes in the target tissues only.
B) is all inactivated by enzymes in the bloodstream.
C) provides for localized effects of suprarenal stimulation.
D) affects its targets for only a few seconds.
E) None of the answers are correct.
A) has a relatively long duration of activity because it may be inactivated by enzymes in the target tissues only.
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A sphincter is a
A. thickening of the longitudinal layer of the muscularis that propels materials through the GI tract. B. circle of adventitia that anchors the GI tract to neighboring structures. C. thickening of the circular layer of the muscularis that controls movement of materials through the GI tract. D. fold of the mucosa of the GI tract that increases the total surface area for absorption of nutrients.
Which of the following statements is/are true regarding uterus?
a. It directly connects to ovaries through Fallopian tubes b. It has a skeletal muscle wall c. It has a smooth muscle wall d. It secretes estrogen e. It is the normal site for implantation
Human somatic cells have ____________ pairs of chromosomes. Two chromosomes that carry the same genes are called a _______________ pair.
Fill in the blank(s) with correct word
Which of the following are pigments that contribute to skin color?
A) collagen; elastic; keratin B) melanin; jaundice; erythema C) sebum; sweat; urea D) melanin; carotene; hemoglobin