The major human nitrogenous waste is
a. allantoin.
b. uric acid.
c. ammonia.
d. urea.
D
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Which of the following statements about movement via actin polymerization is true?
A) Movement can be generated using actin polymerization by itself (no motor proteins). B) Movement occurs only when motor proteins move across actin polymers. C) Actin polymerization prevents growth of filapodia. D) During cell movement there is always a net growth of actin polymer length.
The most important facial muscle used in blinking is the ________.
Fill in the blank(s) with the appropriate word(s).
Which muscle helps create a facial expression of horror and disgust?
A) zygomaticus minor B) zygomaticus major C) platysma D) risorius
Cartilage heals poorly and in many instances does not heal or recover at all after a severe injury. Why not?
What will be an ideal response?