When a small, polar solute binds to a membrane protein that then changes shape and transports the solute across the membrane, the process is known as
A. simple diffusion.
B. channel-mediated diffusion.
C. carrier-mediated diffusion.
D. endocytosis.
E. active transport.
Answer: C
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Lymphatic vessels begin in peripheral tissues and ultimately drain into
A) veins. B) peripheral capillary beds. C) arteries. D) the kidneys. E) arterioles.
In temporal summation, a single presynaptic neuron stimulates the creation of action potentials in a postsynaptic neuron when it
a) stops firing long enough to allow the postsynaptic neuron to recover. b) fires at a fast enough rate that the sum of EPSPs in the postsynaptic neuron moves above threshold. c) fires at a steady rate that allows the postsynaptic neuron to return to resting potential. d) recruits other presynaptic neurons to begin to fire. e) runs out of neurotransmitter.
Which of the following terms refers to fine hairs grown on the fetus?
A) intermediate B) vernix C) terminal D) lanugo E) vellus
Hormones secreted by the gonads have a negative feedback effect on gonadotropins of the anterior pituitary.
Answer the following statement true (T) or false (F)