Which of the following structural features is associated with arteries but not with veins? A) presence of valves
B) thinner tunica media than veins
C) presence of more elastic fibers and elastic laminae
D) larger lumen than veins

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food