Which of the following explains the neural mechanism of an erection?
A. It is a somatic reflex mediated predominantly by sympathetic nerve fibers.
B. It is an autonomic reflex mediated predominantly by parasympathetic nerve fibers.
C. It is an autonomic reflex mediated predominantly by sympathetic nerve fibers.
D. It is an exclusively voluntary action mediated by the cerebral cortex.
E. It is a somatic reflex mediated predominantly by parasympathetic nerve fibers.
Answer: B
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Which of the following inserts into the intertubercular groove of the humerus and acts to extend, adduct, and rotate the shoulder?
A) supraspinatus B) latissimus dorsi C) serratus anterior D) triceps brachii E) trapezius
The esophagus passes through an opening in the diaphragm called the esophageal ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true regarding endocrine glands?
A. They secrete substances that do not alter the metabolism of their target cells, but have extracellular effects. B. They secrete their products by way of ducts. C. They have an unusually low density of blood capillaries. D. They release their secretions into the blood. E. Their secretions may be released onto the body surface.
This figure shows the humerus. The ________ articulates with the depression indicated by number 8.
A. trochlea of the radius B. styloid process of the ulna C. olecranon of the ulna D. head of the radius E. coronoid process of the ulna