Each thin filament consists of
A) A pair of protein strands wound together.
B) Chains of myosin molecules.
C) 6 molecules coiled into a helical structure.
D) A rod-shaped structure with "heads" projecting from each end.
E) A double strand of myosin molecules.
A) A pair of protein strands wound together.
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Which of the following types of muscle tissue is capable of undergoing the stress-relaxation response when they are stretched?
a) cardiac muscle fibers b) fast glycolytic fibers c) fast oxidative-glycolytic fibers d) slow oxidative fibers e) single-unit smooth muscle fibers
The "pacemaker" of the heart is the
A. right bundle branch. B. AV node. C. SA node. D. left bundle branch. E. PM node.
The mitral valve is normally closed ________
A) when the ventricle is in diastole B) when the ventricle is in systole C) when the atrium is contracting D) by the movement of blood from the atrium to the ventricle E) when the ventricle is relaxed
The oral phase of swallowing is under ________ control and the pharyngo-esophageal phase is ________
A) voluntary; also voluntary B) involuntary; also involuntary C) central nervous system; controlled by autonomic reflexes D) central nervous system; also controlled by the central nervous system E) autonomic nervous system; controlled by autonomic reflexes