Which of the following is a component of the neuromuscular junction? a. axon terminal of a somatic motor neuron b. synaptic cleft c. junctional folds of the sarcoplasmic reticulum d. a and b e. a, b, and c

The power stroke of muscle contraction occurs as the myosin head pivots toward its tail and the thin filament slides along the length of the thick filament. A. true  B. false

Which of the following statements relating to the developmental aspects of muscles is false? a. All muscle tissue types arise from myoblasts b. Skeletal muscles become amitotic while smooth muscles regenerate throughout life c. Sarcopenia begins by age 30 and is irreversible d. Body strength per unit muscle mass is the same in both sexes  e. none of the above   Which of the following structures is located in the head region of the thick filament myosin? a. actin binding site b. ATP binding site c. ATPase enzyme d. all of the above e. none of the above

The cell in the center of the electron micrograph above is important in wound healing and plays a role in the pathological process underlying Dupuytren's contracture. Which of the following cell types is depicted? A. Endothelial cell B. Myoepithelial cell C. Myofibroblast D. Pericyte E. Smooth muscle cell

Which of the following happens last in the sliding filament theory?   A. Tropomyosin Shifts B. Calcium binds to troponin C. Myosin binds to actin D. Myosin heads undergo the powerstroke