The area in which the nerve fibers of the retina leave the eye to become the optic nerve is called the
A. ora serrata.
B. ciliary process.
C. trochlea.
D. optic disc.
E. macula lutea.
Answer: D
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Tubular ultrafiltrate enters the collecting duct from the ________.
A. distal convoluted tubule B. glomerulus C. nephron loop D. proximal convoluted tubule
Which of the following describes titin's roles in muscle contraction?
A. Helps to hold the actin myofilaments in position B. Accounts for muscle's extensibility and elasticity C. Allows the sarcomere to recoil and stretch D. Accounts for muscle's excitability
Of the lymphatic trunks, which ones drain lymph from deep thoracic structures?
A. Lumbar trunks B. Subclavian trunks C. Bronchomediastinal trunks D. Intestinal trunks E. Jugular trunks
The olfactory receptor cell can be activated by as few as ________ odorant molecules
A) 1 B) 2 C) 3 D) 4 E) 5