Which class of hormones are polar and, accordingly, hydrophilic?
a. Peptides
b. Catecholamines
c. Steroids
d. Both a and b
e. None of the above
D
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What type of proteins are present at chemical synapses to ensure the close proximity of the presynaptic and postsynaptic membranes?
A. Myelin B. Terminal boutons C. Connexins D. Cell adhesion molecules (CAMs)
Which of the following statements regarding blood clotting is TRUE?
A. Blood clotting requires activation of thrombin. B. Blood clotting is enhanced by prostaglandin I2 (PGI2) and nitric oxide. C. A blood clot is a network of interlacing strands of fibrinogen. D. Blood clotting occurs too rapidly in indivduals with the disease hemophilia. E. Injecting tissue plasminogen activator (t-PA) into a patient who is bleeding will aid blood clotting.
Cataract leads to blindness due to
a) loss of transparency of the lens. b) a high intraocular pressure. c) photophobia. d) scotoma. e) trachoma.
Which of the following muscles is not a muscle of the trunk?
a. rectus abdominis b. iliopsoas c. internal oblique d. external oblique