Which of these is a major difference between smooth muscle and skeletal muscle?
A. Myosin is the main regulatory protein in smooth muscle.
B. Myosin is the main regulatory protein in skeletal muscle.
C. Skeletal muscle usually exhibits spontaneous activity, while smooth muscle cannot contract spontaneously.
D. Only skeletal muscle requires increased calcium ion concentration in the cytosol for contraction.
E. Only skeletal muscle has both actin and myosin.
A
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Which chemical class of hormone is more likely to need a binding protein for transport in the blood?
A. water-soluble B. amino acid derivative C. protein D. lipid-soluble
Hank was involved in a car accident during which a flat bone in the anterior region of his thorax was fractured. Which bone is most likely the one that was fractured?
A. Thoracic vertebra B. Sternum C. Clavicle D. Scapula
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a. True b. False Indicate whether the statement is true or false