The human lens focuses light on the photoreceptor cells by
A) moving up and down.
B) moving in and out.
C) changing shape.
D) opening and closing.
E) dilating and constricting.
Answer: C
Anatomy & Physiology
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Approximately 45 percent of blood volume is composed of the
A) clotting factors. B) formed elements. C) leukocytes. D) plasma. E) antibodies.
Anatomy & Physiology
Oxygen and carbon dioxide are exchanged across the respiratory membrane by the process of ________.
A. active transport B. cotransport C. diffusion D. osmosis E. filtration
Anatomy & Physiology
Which of the following is NOT a principle sensor for thirst regulation?
A. Arterial baroreceptors B. Juxtaglomerular apparatus C. Osmoreceptors in the hypothalamus D. Mouth mucosa
Anatomy & Physiology
Once the embryonic mass has 12 or more cells, it is called a
A. morula. B. gastrula. C. blastula. D. blastocyst. E. trophoblast.
Anatomy & Physiology