Which of the following is not a function of the nurse cells?
A. They secrete inhibin.
B. They secrete testosterone.
C. They secrete androgen-binding protein.
D. Their tight junctions form the blood-testis barrier.
E. They protect and support the germ cells.
Answer: B
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Which plexus gives rise to the sciatic nerve?
A. Sacral B. Brachial C. Cervical D. Lumbar E. Coccygeal
Cross-bridges are portions of
A) Actin molecules. B) Myosin molecules. C) Troponin molecules. D) Tropomyosin molecules. E) Calcium ions
Which of the following foods tends to help lower cholesterol levels??
A) ?Eggs B) ?Liver C) ?Beef D) ?Oat bran
Choose the correct statement regarding photoreception.
a. The outer segment contains the photoreceptor's major organelles. b. Each photoreceptor synapses with an amacrine cell. c. The inner segment of a photoreceptor contains flattened membranous plates that contain the visual pigments. d. The pigment epithelium absorbs photons that are not absorbed by visual pigments.