The apical surfaces of intestinal cells have microvilli that are sometimes referred to as the ________.
What will be an ideal response?
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Describe the structural characteristics of the small intestine that enhance its function as the major absorber of nutrients
What will be an ideal response?
The tremendous surface tension of pure water is normally counteracted by pulmonary surfactant
a. True b. False Indicate whether the statement is true or false
Neurotransmitter is being released at a synapse. Which of the following occurs last?
A. Calcium ions enter the presynaptic terminal. B. Synaptic vesicles release neurotransmitter by exocytosis. C. An action potential is produced in the postsynaptic membrane. D. Neurotransmitter flows rapidly across the synaptic cleft. E. Neurotransmitter binds with the receptor on the postsynaptic membrane.
The muscularis layer in the wall of the digestive tract is
A. skeletal muscle throughout the tract, especially in the large intestine. B. the layer of the digestive tract wall that contains capillaries. C. in direct contact with the food that is consumed. D. composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers. E. connective tissue and the peritoneum.