The normal pH for blood plasma is
A. 7.00.
B. 7.25 - 7.35.
C. 7.35 - 7.45.
D. 7.45 - 7.55.
E. 6.80 - 7.20.
C
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Which one of these muscles helps to open the mouth (depress the mandible)?
A. Hyoglossus B. Depressor anguli oris C. Sternohyoid D. Digastric E. Zygomaticus major
What is responsible for initiating contraction of smooth muscle?
a. stimulation by motor neurons b. inhibition of acetylcholinesterase c. membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane d. excitation of the gap junctions by transmitter substance e. stimulation by the autonomic nervous system
After carrying a heavy box, you put it down by lowering it with your arms. Your biceps brachii muscles are contracting, but not forcefully enough to shorten and lift the box back up. This type of contraction is specifically called a(n) ________ contraction.
Fill in the blank(s) with the appropriate word(s).
Because of anatomical differences in the olfactory system, the sense of smell may be more important to this animal than it is to humans
A) sheep B) fish C) predatory bird