The diffusion of water through a semi-permeable membrane is called __________.
Fill in the blank(s) with the appropriate word(s).
osmosis
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When it is cold, the __________ contracts and draws the testes closer to the body to keep them warm.
A. cremaster muscle B. pampiniform plexus C. corpus spongiosum D. perineum E. corpus cavernosum
Catecholamines are secreted from the adrenal medulla in response to
a. increased secretion of ACTH from the anterior pituitary b. direct sympathetic nervous system stimulation c. decreased androgen secretion from the adrenal cortex d. a tropic hormone secreted by the pituitary e. stimulation by chromaffin-releasing hormone
In the process of diffusion, net movement of substances is always from a region
A. of lower concentration to a region of higher concentration. B. outside the cell to a region inside the cell. C. inside the cell to a region outside the cell. D. of higher concentration to a region of lower concentration. E. None of the choices are correct.
Ribs that do not attach directly to the sternum are called _____ ribs
A. false B. vertebral C. vertebrosternal D. vertebrochondral E. floating