The organ that monitors and adjusts the composition of tubular fluid, recycles damaged spermatozoa, and is the site of sperm maturation is the
A) ductus deferens.
B) rete testis.
C) seminal gland.
D) epididymis.
E) prostate gland.
Answer: D
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What type of cells do natural killer cells destroy?
a. antibody marked cells b. bacteria and virus-infected cells c. bacteria and cancerous cells d. cancerous cells and virus-infected cells e. None of the above
This type of membrane lines a body cavity that does NOT open directly to the outside.
a. Cutaneous b. Serous c. Mucous d. Basement e. Connective.
Which of the following is NOT true of nail structure?
A. The nail bed consists of cells of the stratum basale. B. Cell division occurs in the cuticle. C. The nail plate consists of dead cells of the stratum corneum. D. The nail plate consists of the nail root, and nail body, and the free edge. E. All of these are true of nail structure.
Define gated ion channels
A) Gated ion channels are pumps in the plasma membrane for specific ions. B) Gated ion channels allow water to pass through the plasma membrane for osmotic balance. C) Gated ion channels allow all ions to enter a cell but do not allow any ions to exit a cell. D) Gated ion channels do not allow any ions to enter a cell but allow all ions to exit a cell. E) Gated ion channels are channels that open or close in response to specific stimuli.