When light strikes a photoreceptor it
A. deporlarizes and releases more neurotransmitter.
B. depolarizes and releases less neurotransmitter.
C. hyperpolarizes and releases more neurotransmitter.
D. hyperpolarizes and releases less neurotransmitter.
D
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Which is not a portion of the urethra?
A. external urethral orifice B. internal urethral sphincter C. prostatic urethra D. membranous urethra E. spongy urethra
When a neuromodulator slows the reuptake of a neurotransmitter or causes expression of an increased number of receptors on postsynaptic neurons, the effect is called
A. presynaptic potentiation. B. recruitment. C. spatial summation. D. facilitation. E. temporal summation.
The presence of ____________________ in the stomach is the main stimulus to enhance gastric secretion
Fill in the blank(s) with correct word
A sarcomere is the
A. contractile thread that extends the length of the muscle fiber. B. plasma membrane of a muscle fiber. C. protein strand composed of actin or myosin. D. structural and functional unit of the skeletal muscle fiber. E. cytoplasm of a muscle fiber.