The chemical properties of an atom are determined by its ________
A) protons and neutrons
B) neutrons
C) electrons
D) protons
E) particles
C
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Which of the following constitutes the pectoral girdle?
A) clavicles only B) clavicles and scapulae C) clavicles, scapulae, and humerus D) clavicles, scapulae, humerus, radius, and ulna E) clavicles, scapulae, humerus, radius, ulna, and carpal bones
Why do individual muscle twitches have to be added together, as in summation or tetanus?
A) Only added twitches produce any muscle contraction: A fiber undergoing a muscle twitch does not contract at all. B) There has to be a critical mass of muscle twitches for calcium to be released into the muscle cell. C) Not enough acetylcholine will be produced for contraction without multiple twitches. D) Multiple twitches add up to an increase in muscle fiber tension, which increases the strength of the muscle. E) Not enough ATP is generated by one muscle twitch.
Which of the following hormones requires a releasing hormone from the hypothalamus
for its secretion? A) Prolactin B) Oxytocin C) Melatonin D) Antidiuretic hormone
During aging of the integumentary system, sweat production increases as a result of improved sweat gland activity.
Answer the following statement true (T) or false (F)