Where is digestion completed?
a. stomach.
b. small intestine lumen.
c. on the brush borders of the small intestine epithelial cells.
d. colon.
e. rectum.
C
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When stress is applied to a bone,
A) the minerals in the bone produce a weak electrical field that attracts osteoblasts. B) osteoclast activity increases and osteoblast activity decreases. C) the bone becomes thin and brittle and ultimately fractures. D) the bone compensates by becoming thinner in the region of stress. E) blood supply through the nutrient artery diminishes and thus remodeling proceeds at a much slower rate.
Most commonly, a synapse is made between a
A. presynaptic neuron's dendrite and a postsynaptic membrane's cell body. B. presynaptic neuron's axon and a postsynaptic neuron's dendrite. C. presynaptic neuron's axon hillock and a postsynaptic neuron's cell body. D. presynaptic neuron's soma and a postsynaptic neuron's synaptic knob.
Action potentials from sympathetic neurons ________ glomerular filtration rate by causing ________.
A. increase; dilation of afferent glomerular arterioles B. increase; dilation of efferent glomerular arterioles C. decrease; constriction of afferent glomerular arterioles D. decrease; constriction of efferent glomerular arterioles
What is the function of the iris?
A. Changes the shape of the lens B. Refracts light rays C. Regulates the size of the pupil D. Absorbs stray light rays