The ________ is the opaque, tough part of the eye that protects more delicate structures inside.
A. lens
B. choroid
C. cornea
D. sclera
Answer: D
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This type of tissue specializes in movement of the body.
A. Epithelial B. Connective C. Muscle D. Nervous
A second nerve impulse cannot be generated until ________
A) all sodium gates are closed B) the membrane potential has been reestablished C) the Na ions have been pumped back into the cell D) proteins have been resynthesized
A(n) ____________, or cross, section is a horizontal cut that divides the body into upper and lower parts.?
Fill in the blank(s) with correct word
What is true of the semilunar valves?
A) They are both on the right side of the heart. B) They lie between the atria and the ventricular chambers on each side of the heart. C) They lie between ventricles and the large arteries that leave the ventricles on each side of the heart. D) They are both on the left side of the heart.