In the parasympathetic branch of the nervous system, which activity does acetylcholine NOT perform?
A. Exciting skeletal muscles
B. Inhibiting cardiac muscle activity
C. Blocking smooth muscle activity
D. Stimulating emotion and memory
Answer: D
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What is the most likely reason humans have only two nipples?
A. Our primate ancestors probably had litters. B. Primates generally have only one offspring. C. Having two nipples is associated with upright walking (bipedality). D. Most mammals have only two nipples. E. The number of nipples was reduced in humans due to sexual selection.
The removal of amino group from a protein to prepare it to enter the citric acid cycle is termed
A) transamination. B) deamination. C) decarboxylation. D) amination. E) beta-oxidation.
Fixed acids are generally regulated by physiological buffering provided by the
A. respiratory system. B. kidneys. C. lymphatic system.
The two components of the integumentary system are the
A) epidermis and dermis. B) cutaneous membrane and hypodermis. C) cutaneous membrane and accessory structures. D) integument and hypodermis. E) epidermis and superficial fascia.