You and your lab partner have prepared a frog nerve for gathering data on action potentials. You connect an electronic stimulator to the nerve and ask your partner to gradually increase the voltage until you see an action potential. Your partner says that the voltage knob is stuck, that is, it will not increase the voltage. Is there another way to trigger action potentials using this stimulator?
If so, what do you tell your partner to do?
What will be an ideal response?
Your lab partner can increase the stimulus frequency instead. A higher frequency of stimuli can result in temporal summation of graded potentials such that the lower voltages sum to threshold.
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Which of the following conditions would result in a systemic arterial PO2 lower than is typical of a healthy person at sea level?
A. Breathing regular air in a hyperbaric chamber (higher that normal atmospheric pressure) B. Having iron-deficiency anemia C. Traveling to high altitude D. Maintaining alveolar ventilation constant while decreasing metabolic rate E. Breathing 100% oxygen
The internal connective tissue network of the heart is called the ________ of the heart.
Fill in the blank(s) with the appropriate word(s).
Antineoplastics are safe to handle using usual methods
a. true b. false
As a way to conserve glucose for the cells of the nervous system during glucose sparing, the body preferentially catabolizes:
A) glycogen. B) amino acids. C) glycerol. D) fatty acids.