In the testes, __________ cells provide nourishment for the germ cells.
Fill in the blank(s) with the appropriate word(s).
sustentacular
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Lymphatic capillaries
A. include layers of smooth muscle for peristalsis. B. cannot be discerned structurally from cardiovascular system capillaries. C. originate as closed-ended tubes associated with blood capillary networks. D. filter lymph. E. concentrate lymph prior to passing it to larger lymphatic vessels.
Why would removal of the thymus compromise humoral immunity?
A. Helper T cells mature in the thymus and are needed to activate B cells and humoral immunity. B. B cells responsible for humoral immunity mature in the thymus. C. Once activated, B cells must travel to the thymus in order to produce antibodies. D. Most mature B cells reside in the thymus, so removing the thymus removes the majority of the body's B cells.
According to the Laplace's law, as the diameter of a blood vessel increases, the force applied to the wall of that vessel ________.
A. increases B. decreases C. remains the same D. increases, then decreases E. None of the choices are correct.
Someone with an asthenic build
A. has a slight build with a long, narrow, and shallow thorax that is wider more superiorly. B. has an average build with respect to height, weight, and torso length. C. has a massive, truncated build with a short, broad, and deep thorax. D. None of the above