The stronger the triggering event:
a. the larger the graded potential
b. the smaller the graded potential
c. the larger the action potential
d. the lower the frequency of action potentials
e. all of these answers.
A
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If humans administered a physiological dose of ufo-epi responded to the chemical, which of the following would indicate ufo-epi is an epinephrine agonist?
An alien retrieved alive from a crashed UFO has had a thorough medical examination. A hormone with a distinct but similar structure to epinephrine has been isolated, and named ufo-epi. A) increase in fatty acids in the blood B) decreased heart rate C) constriction of respiratory tubes D) localized sweating E) hyperglycemia (high blood glucose)
Cerebrospinal fluid (CSF) is formed primarily by the ____
a. inner meninges b. nerve root ganglions c. arachnoid matter d. glial cells e. choroid plexuses
The major factor that promotes increased secretion of cortisol from the adrenal cortex is
a. low Na+ concentration in the extracellular fluid. b. stress. c. angiotensin II. d. increased blood amino acid concentration. e. increased blood glucose concentration.
Which of these would occur if the concentration of ATP were depleted in a typical nerve cell?
A. Resting membrane potential would become more negative. B. Resting membrane potential would become less negative. C. The concentration gradient for Na+ would remain the same. D. The resting membrane potential would eventually become positive inside with respect to outside. E. There would be no change in the resting membrane potential.