Interactions between actin and myosin filaments of the sarcomere are responsible for
A) Muscle fatigue.
B) The conduction of neural stimulation to the muscle fiber.
C) Muscle contraction.
D) Muscle relaxation.
E) The striped appearance of skeletal muscle.
C) Muscle contraction.
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When a nerve impulse reaches the transmissive segment of a neuron,
A. calcium is pumped into the neuron and neurotransmitter diffuses out through channels. B. calcium is released from the neuron along with neurotransmitter from synaptic vesicles. C. calcium diffuses into the neuron and neurotransmitter is released by exocytosis. D. calcium and neurotransmitter diffuse into the synaptic knob. E. calcium is immediately pumped out of the neuron and vesicles of neurotransmitter undergo phagocytosis.
Which of the following is not a function of lymph nodes?
A) act as lymph filters and activate the immune system B) produce lymphoid cells and granular WBCs C) produce lymph fluid and cerebro-spinal fluid D) serve as antigen surveillance areas
The rate of diffusion increases as the concentration gradient increases.
Answer the following statement true (T) or false (F)
Hypothyroidism could lead to elevated prolactin levels because ________.
A. TRH stimulates prolactin release B. low levels of T3 and T4 decrease prolactin C. TRH would cause negative feedback to prolactin D. prolactin stimulates TRH production