Which of the following statements concerning HCl secretion by the stomach is correct?
a. HCl inactivates salivary amylase
b. HCl activates pepsinogen.
c. provides an acid medium for optimal pepsin activity.
d. denatures proteins
e. all of these answers.
E
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White blood cells engulf bacteria through the process of __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about hormone synthesis is NOT correct?
A. Progesterone is a precursor of mineralocorticoid and glucocorticoid hormones. B. Pregnenolone is a precursor for all steroid hormones. C. Progesterone can be a precursor of cortisol. D. Peptide hormones are polymers of amino acids. E. Tryptophan is a precursor for thyroid hormones.
Which cranial nerve innervates most of the viscera in the thoracic and abdominopelvic cavities?
A. Abducens nerve (VI) B. Vagus nerve (X) C. Trochlear nerve (IV) D. Accessory nerve (XI) E. Hypoglossal nerve (XII)
How many pulmonary arteries empty into the right atrium of the heart?
A) 4 B) 0 C) 2 D) 8 E) 1