Which of the following is true about skeletal muscle?
A. Sensory neurons stimulate muscles to contract.
B. There are very few blood vessels in skeletal muscle.
C. Every muscle fiber receives a branch of an axon from the nerve.
D. There are very few nerve fibers in a muscle.
E. All of these are true.
C
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Match the following:
A) Norepinephrine B) Endorphins C) Substance P D) Histamine E) Glycine 1) Increases acid secretion in the stomach; blocked by cimetidine. 2) "Feel-good" neurotransmitter. 3) Mediates pain. 4) Principal inhibitory neurotransmitter of the spinal cord. 5) Natural opiates that inhibit pain; effect mimicked by morphine.
What part of the brain sets the basic respiratory rhythm?
A. Hypothalamus B. Limbic system C. Cerebral cortex D. Pons E. Medulla oblongata
Match the cell of adaptive immunity with its function.A. Quick and responsive to antigen, remembers previous exposureB. After activation, differentiates to become plasma cell or memory B cellC. Produces antibodiesD. Destroys cells by lysis or by production of cytokinesE. Activates B and effector T cellsPlasma cell
Fill in the blank(s) with the appropriate word(s).
What is the role of an inhibitory interneuron in a stretch reflex?
A. It sends inhibitory commands to the opposite limb, so it will not respond. B. Inhibitory interneurons are not involved in stretch reflexes. C. It ensures that the reflex does not damage the effectors. D. It is used to inhibit the antagonistic muscles from contracting at the same time as the effectors of the reflex. E. It is used to ensure that the effectors do not contract excessively.