Which of the following statements about the Na+ and K+ gradients in neurons is NOT true?
a. In a resting neuron the electrical gradient for sodium is inward.
b. In a resting neuron the electrical gradient for potassium is inward.
c. In a resting neuron the concentration gradient for sodium is outward.
d. In a resting neuron the concentration gradient for potassium is outward.
e. In a resting neuron, the electrical and concentration gradients for sodium andpotassium result in a membrane potential.
C
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Which of the following statements about the refractory period of a membrane is TRUE?
A. The refractory period places an upper limit on the frequency with which a nerve cell can conduct action potentials. B. The refractory period prevents the action potential from spreading back over the part of the membrane that just underwent an action potential. C. The absolute refractory period refers to the period of time during which another action potential cannot be initiated in that part of the membrane that is undergoing an action potential, no matter how great the strength of the stimulus. D. The relative refractory period refers to the period of time during which another action potential can be initiated in that part of the membrane that has just undergone an action potential if a stronger than normal stimulus is applied. E. All of the answer choices are correct.
Which of the following individuals would lose heat faster in a cold room?
A) an adult man B) a newborn infant C) an adolescent male D) an adult woman E) a child
Prior to her surgery, Frannie had ______________________________________ X-rays taken to determine the type of fracture she had
Fill in the blank(s) with correct word
Anti-Mullerian hormone is produced by the
A. ovaries. B. testes. C. kidneys. D. hypothalamus. E. probladder.