BRS CELL PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
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BRS PHYSIOLOGY
BRS CELL PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
1. Which of the following characteristics is shared by simple and facilitated diffusion of glucose?
(A) Occurs down an electrochemical gradient
2. During the upstroke of the nerve action potential
th...
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BRS CELL PHYSIOLOGY EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
LATEST UPDATE
1. Which of the following characteristics is shared by simple and facilitated
diffusion of glucose?
(A) Occurs down an electrochemical gradient
2. During the upstroke of the nerve action potential
there is net inward current and the cell interior becomes less negative
3. Solutions A and B are separated by a semipermeable membrane that is perme-
able to K+, but not to Cl-. Solution A is 100 mM KCl, and solution B is 1 mM KCl.
Which of the following statements about solution A and solution B is true?
K+ will diffuse from solution A to solution B until a membrane potential develops with
solution A negative with respect to solution B 4.
4. The correct temporal sequence for events at the neuromuscular junction is
uptake of Ca2+ into the presynaptic ter- minal; release of acetylcholine (ACh);
depolarization of the muscle end
5. Which characteristic or component is shared by skeletal muscle and smooth
muscle?
Elevation of intracellular [Ca2+] for excitation-contraction coupling
, 6. Repeated stimulation of a skeletal muscle fiber causes a sustained contraction
(tetanus). Accumulation of which solute in intracellular fluid is responsible for the
tetanus?
Ca2+
7. Solutions A and B are separated by a mem- brane that is permeable to Ca2+
and imper- meable to Cl-. Solution A contains 10 mM CaCl2, and solution B
contains 1 mM CaCl2. Assuming that 2.3 RT/F = 60 mV, Ca2+ will be at
electrochemical equilibrium when
solution A is -30 mV
8. A 42-year-old man with myasthenia gravis notes increased muscle strength
when he is treated with an acetylcholinesterase (AChE) inhibitor. The basis for
his improvement is is increased
levels of ACh at the muscle end plates
9. In a hospital error, a 60-year-old woman is infused with large volumes of a
solution that causes lysis of her red blood cells (RBCs). The solution was most
likely
300 mM urea (or hypotonic urea)
10. During a nerve action potential, a stim- ulus is delivered as indicated by the
arrow shown in the following figure. In response to the stimulus, a second action
potential
will not occur
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