Describe the events that occur during each phase of a twitch in a stimulated muscle fiber
What will be an ideal response?
In an initial latent period (after the stimulus arrives and before tension begins to increase), an action potential generated in the muscle fiber triggers the release of calcium ions from the SR. In the contraction phase, calcium ions bind to troponin (cross-bridges form), and tension begins to increase. In the relaxation phase, tension decreases because cross-bridges have detached and because calcium ion levels have fallen; the active sites are once again covered by the troponin-tropomyosin complex.
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In order to accommodate the large liver,
A. the left kidney is about 2 centimeters inferior to the right kidney. B. the right kidney is about 2 centimeters inferior to the left kidney.
Tumor cells can be spread through the __________________________________________________ or __________________________________________________
Fill in the blank(s) with correct word
Which of the following is NOT an example of the cooperative effects of the sympathetic and parasympathetic divisions of the ANS?
A. Saliva production B. Male sexual function C. Micturition D. Sweating
The ion required for coagulation is ________.
A. K+ B. Ca2+ C. Na+ D. Cl-