____________________ are water channels in the tubular cells of the nephron
Fill in the blank(s) with correct word
Aquaporins
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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.
The muscle tissue of the digestive system is called ________ muscle.
What will be an ideal response?
The all-or-none principle states that
A) all stimuli will produce identical action potentials. B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials. C) the greater the magnitude of the stimuli, the greater the intensity of the action potential. D) only sensory stimuli can activate action potentials. E) only motor stimuli can activate action potentials.
What would happen if spindle fibers failed to form in a cell during mitosis?
What will be an ideal response?