Although B-cells (as plasma cells) are specialized to secrete antibodies, they require the assistance of a number of other types of cells, including
a. macrophages.
b. dendritic cells.
c. T-helper cells.
d. all of these.
e. none of these.
D
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We can distinguish between sensations that originate in different areas of the body because
A) different sensory receptor types produce different action potential types. B) incoming sensory information is first assessed by the thalamus. C) sensory neurons from each body region synapse in specific brain regions. D) sensory neurons carry only one type of information. E) None of the answers are correct.
The kidneys:
a. receive 10% of the blood pumped from the heart b. help maintain proper blood pH c. receive 5% of the blood pumped from the heart d. both A and B above
Which of the following is the correct sequence in a typical reflex arc?
A) effector, sensory neuron, integration center, motor neuron, receptor B) receptor, sensory neuron, integration center, motor neuron, effector C) effector, motor neuron, integration center, sensory neuron, receptor D) receptor, motor neuron, integration center, sensory neuron, effector E) receptor, sensory neuron, motor neuron, integration center, effector
By what transport mechanism does glucose enter most cells?
A. diffusion through the lipid bilayer B. primary active transport C. secondary active transport D. diffusion through a protein channel E. facilitated diffusion