In both ON and OFF visual pathways, light stimulates the release of glutamate onto bipolar cells.
Answer the following statement true (T) or false (F)
False
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Positive feedback mechanisms usually produce
A. long-term changes. B. unstable conditions. C. stable conditions around a set point. D. changes returning values toward a set point.
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
Which of the following systems is NOT used to excrete wastes from the body?
respiratory system integumentary system lymphatic system digestive system
Skeletal muscle fibers
a. are some of the longest cells in the body b. are attached end-to-end within a muscle c. contain Z lines within their A bands d. contain only one nucleus e. exhibit characteristics b and c