With advancing age, ________ become less elastic as the cross-links that hold
collagen molecules together break down.
Fill in the blank(s) with correct word
ligaments
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What area in the figure is the sum of the tidal volume and the inspiratory reserve volume?
a) A b) B c) G d) E e) H
Special sensory receptors differ from simple receptors in that
A) each can be stimulated by many different types of stimuli. B) they are restricted in the stimuli to which they respond. C) they are found in more locations on the surface of the body. D) they are surrounded by accessory structures that enhance receptor sensitivity. E) All of the answers are correct.
Which hormones use second-messenger systems?
a. proteins b. catecholamines c. steroids d. thyroid hormone e. Both c and d
In mammals, gonadal differentiation is determined by
a. genotypic sex. b. gonadal sex. c. the presence or absence of the Y chromosome. d. the presence or absence of the X chromosome. e. the presence or absence of specific hormones.