Which of the skin layers below is the most superficial?
A) Papillary layer
B) Epidermis
C) Reticular layer
D) Basal lamina
E) Hypodermis
B
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What is the most distinguishing characteristic of muscle tissue?
A) the design of the fibers B) the sarcoplasmic reticulum C) the diversity of activity of muscle tissue D) the ability to transform chemical energy into mechanical energy
Which of the following are functions of aqueous NaHCO3 secreted by the pancreas into the duodenum?
a. neutralization of acidic gastric contents emptied into the duodenum. b. prevention of irritation of the duodenal mucosa. c. active digestion of fat molecules into fatty acids. d. both (a) and (b) above. e. all of these answers.
Na+ and K+ both use ________ to passively diffuse across the plasma membrane
A) facilitated diffusion B) exocytosis C) voltage-gated channels D) leak channels E) carrier-mediated transport
Hormone receptor molecules may be ____ in order to change the target cell's sensitivity to a given hormone
A. increased in number B. decreased in number C. chemically altered D. moved E. increased in number, decreased in number and chemically altered