Which blood vessel supplies blood to the pericardium, mediastinum, and the diaphragm?
A) ventral thoracic artery
B) vertebral artery
C) internal mammary artery
D) internal maxillary artery
C
Explanation:
A) The ventral thoracic artery arises and passes caudally to supply the medial ends of the pectoral muscles.
B) Each vertebral artery gives off branches to the deep neck muscles and to the spinal cord near the foramen magnum.
D) Each internal maxillary and each carotid plexus carries blood to the brain, eye, and other deep structures of the head.
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Which of the following is incorrect pertaining to the thoracic sympathetic trunk?
A) It is in continuity with the cervical and lumbar sympathetic trunks. B) It lies against the heads of the ribs in the superior part of the thorax. C) It only supplies postganglionic sympathetic fibers to thoracic viscera. D) It gives rise to the greater, lesser, and least splanchnic nerves. E) It has white and gray rami at each level.
The type of muscle that has elongated, multinucleated cells and is under voluntary control is __________ muscle
A. skeletal B. cardiac C. smooth
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Which of the following is the last step in the sequence of events happening when cyclic AMP acts as a second messenger?
A. G protein is activated by the binding of a hormone to the receptor B. Enzymes are activated or deactivated by the action of protein kinases C. Adenylate cyclase produces cAMP D. G protein activates adenylate cyclase E. cAMP activates protein kinases