Components of the first line of defense include all the following, except
A. nasal hairs.
B. phagocytic white blood cells.
C. flushing action of tears and blinking.
D. flushing action of urine.
E. the tough cell sheet of the upper epidermis of the skin.
Answer: B
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Answer the question using the accompanying figure.Which label identifies the structure through which the vibrations
of the oval window pass?
a. 1 b. 2 c. 3 d. 5 e. 7
Action potentials occur when _____
a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps kick into action d. neurotransmitter is reabsorbed
Exocrine glands:a
have a duct. b. cannot secrete mucus. c. are made of endothelial tissue. d. secrete hormones. e. transport products through interstitial fluid.
Which natural factors affect changes in genetic variation?
What will be an ideal response?