Which is a TRUE statement about smooth muscle?
A. Smooth muscle is striated.
B. Smooth muscle does not have thick and thin filaments.
C. Smooth muscle does not use troponin-tropomyosin to regulate cross-bridge activity.
D. Changes in cytosolic calcium do not regulate cross-bridge activity in smooth muscle.
E. The myosin in smooth muscle requires phosphorylation before it can bind to ATP.
C
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Vincristine is a vinca alkaloid used as a cancer treatment. This drug disrupts the formation of the mitotic spindle fibers. Why do you think vincristine is an effective chemotherapy drug? Explain the effects of this drug on cell division
What will be an ideal response?
Sperm cannot fertilize an egg until what has occurred?
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The __________ of the kidney is segregated into triangular regions with a striped appearance.
a) cortex b) nephron c) medulla d) renal pelvis