The effects of a neurotransmitter on the postsynaptic membrane include which of the following?
A) The neurotransmitter floats around in the synaptic cleft.
B) Upon stimulation, the membrane releases more neurotransmitter molecules.
C) Excitatory or inhibitory responses.
D) Neurotransmitter molecules are absorbed by the postsynaptic cell.
E) None of the answers are correct.
C) Excitatory or inhibitory responses.
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Receptors
a. respond to various physical or chemical changes in their environment b. change other forms of energy into receptor potentials c. respond more readily to their adequate stimulus d. are found at the peripheral endings of afferent neurons e. exhibit all of the above
Cross bridges
a. bind to actin during muscle contraction b. are globular heads made of myosin c. do not bend during muscle contraction d. have characteristics a and b e. have characteristics b and c
Aldosterone stimulates ion pumps along the distal convoluted tubule (DCT), the collecting tubule, and the collecting duct, causing __________.
countercurrent multiplication a decrease in the concentration of the filtrate a reduction in the number of sodium ions lost in the urine an increase in the number of sodium ions lost in the urine
The nutrients that yield the most energy per gram when metabolized are ________.
A) proteins. B) fats. C) nucleic acids. D) carbohydrates. E) vitamins.