This figure shows a lateral view of the muscles of facial expression. What muscle does number 4 indicate?
A. Buccinator
B. Temporalis
C. Platysma
D. Masseter
E. Sternocleidomastoid
Answer: C
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Which number indicates a postganglionic axon?
A. 3 B. 4 C. 5 D. 6 E. 7
The reaction in which water and carbon dioxide combine to form carbonic acid is
A. irreversible, as carbonic acid rapidly causes a drop in pH. B. reversible, and can proceed in either direction depending on the concentrations of the molecules. C. exergonic, and is an important energy source within the body. D. an exchange reaction in which protons are transferred between atoms. E. a catabolic reaction in which the formation of a larger molecule can lead to an increase in cell size.
The enteric nervous system controls:
a. the skeletal muscles b. the digestive system c. the cardiovascular system d. all endocrine glands e. the entire PNS
How many nucleotides are needed to form a codon?
A. 20 B. 3 C. 2 D. None of the choices are correct.