The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?
A) to flex and adduct the humerus and to act as a synergist of the pectoralis major
B) to initiate abduction of the arm, to stabilize the shoulder joint and to help prevent downward dislocation of the humerus
C) to extend and medially rotate the humerus and to act as a synergist of the latissimus dorsi
D) to help hold the head of the humerus in the glenoid cavity and rotate the humerus laterally
B
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Which of the following is a spasmodic contraction of the diaphragm followed by spasmodic closure of the rima glottidis, which produces a sharp sound on inhalation?
a) sneezing b) coughing c) laughing d) hiccupping e) Valsalva maneuver
During a race, a long-distance runner twisted his ankle. He finished the race without feeling any pain in his ankle. This lack of the perception of pain could be the result of an increase in ________.
A. epinephrine B. somatotropins C. gonadotropins D. beta endorphins E. lipotropins
Which of the following is a true difference between electrical and chemical synapses?
A) Electrical synapses are found in the central nervous system. B) Electrical synapses are the most common type of synapse. C) Electrical synapses typically send information in one direction (presynaptic cell to postsynaptic cell). D) Electrical synapses are much faster.
The production of lymphocytes is called
A) erythropoiesis. B) lymphopoiesis. C) granulogenesis. D) immunocompetence. E) lymphogenesis.