Define Golgi tendon organs and muscle spindles relative to the stretch reflex.
What will be an ideal response?
Golgi tendon organs work with muscle spindles to act as proprioceptors in skeletal muscles and their associated tendons. When muscles are stretched due to contraction of antagonist muscles, the sensory neurons send impulses to the spinal cord, where they synapse with motor neurons of the stretched muscle. Impulses are then sent to the stretched muscle, which then resists further stretching. This prevents muscle tissue damage.
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Terry suffers from dissociation of memories from their emotional content as the result of an automobile accident. What system of the brain is probably damaged?
A) the prefrontal lobe B) the general interpretive area C) the limbic system D) the preoptic area E) the reticular activating system
Identify the sensory inputs that would stimulate the reticular activating system
a darkened room a set of silencing headphones breakfast odors smelling salts a ringing fire alarm
During contraction of skeletal muscle fibers, the
a. contractile proteins shorten b. thin filaments slide inward toward the A band's center as a result of cycles of cross-bridge binding and bending c. thick and thin filaments become tightly coiled, thus shortening the sarcomere d. I bands slide in between the A bands e. lateral sacs of the sarcoplasmic reticulum shorten, pulling the Z lines closer together
Select the correct statement about the heart valves.
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur. The tricuspid valve divides the left atrium from the left ventricle. The mitral valve separates the right atrium from the right ventricle. Aortic and pulmonary valves control the flow of blood into the heart.