A neuron fires when Na+ ions
A. move down their concentration gradient by the process of facilitated diffusion.
B. are actively pumped down their concentration gradient.
C. move against their concentration gradient spontaneously.
D. are actively pumped against their concentration gradient.
E. are released from an internal store.
A. move down their concentration gradient by the process of facilitated diffusion.
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Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Which choice accurately conveys the complexity of neural connections in the human brain?
A) About 100 billion neurons each contact 1,000 to 10,000 other neurons. B) A million or so neurons each contact up to 100 other neurons. C) 10 million or so neurons each contact up to 10,000 other neurons. D) A billion or so neurons each contact up to a million other neurons.
Some conditions like progeria do not run in families despite being autosomal dominant. How is this possible? What will be an ideal response?
The subunit of a kidney that purifies blood and
restores solute and water balance is the a. glomerulus. b. loop of Henle. c. nephron. d. ureter. e. peritubular capillary.