Following an automobile accident, a broken rib penetrates into the pleural cavity causing a lung to collapse. What condition is this?
A. Cystic fibrosis
B. Hemothorax
C. Atelectasis
D. Pneumothorax
E. Tension pneumothorax
Answer: C
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The role of acetylcholine in the digestive tract is to ________, while the role of norepinephrine is to ________.
A. inhibit; inhibit B. stimulate; stimulate C. inhibit; stimulate D. stimulate; inhibit
The connective tissue covering around a bundle of fibers (fascicle) within a nerve is called the __________.
Fill in the blank(s) with the appropriate word(s).
What is the effect of sympathetic innervation to the lungs?
A. Increased diameter of the bronchi B. Constriction of bronchioles C. Dilation of bronchioles D. Increased activity of the mucociliary elevator E. Contraction of smooth muscle in the bronchioles
A motor unit refers to
a. a single motor neuron plus all of the muscle fibers it innervates. b. a single muscle fiber plus all of the motor neurons that innervate it. c. all of the motor neurons supplying a single muscle. d. a pair of antagonistic muscles. e. a sheet of smooth muscle cells connected by gap junctions.