The functional units of a muscle cell are composed of what?
A. Sarcolemma
B. Sarcoplasmic reticulum
C. Myofibril
D. Sarcomere
Answer: C
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HIV is spread through sexual intercourse, hypodermic needles and sneezing or coughing.
a. true b. false
Which of these is not a property of the renal counter-current multiplier?
a) It is opposed by the vasa recta. b) It depends on active ion transport to function. c) It creates a hyperosmotic interstitial fluid in the kidney medulla. d) It exploits the structure of the nephron loop.
The left atrium
A. receives oxygen-poor blood from the body tissues. B. receives oxygen-rich blood from the lungs. C. pumps oxygen-rich blood toward the body tissues. D. pumps oxygen-poor blood to the lungs.
The papillae located mainly on the tip and sides of the tongue that contain only a few taste buds each are the ________ papillae.
A. papiform B. foliate C. filiform D. vallate E. fungiform