3)slow twitch muscle fibers: a)have characteristically high myoglobin levels, b)

Question

3)slow twitch muscle fibers: a)have characteristically high myoglobin levels, b) are fatigue resistant c) have few mitrochondria d) a & b, e) a & c

4)Lo represents: a) optimal saromere overlap, b) longest sarcomere length, c) shortest sarcomere length, d) suboptimal sarcomere overlap, d) none of the above

5)the latch property of smooth muscle refers to the ability of smooth muscle to maintain: a) the rate of atp production after stimulation, b) maintaining force production while decreasing the rate of energy utilization, c) force in the absence of myosin light chain phosphorylation, d) entirely relaxed state independent of free Ca++ levels, e) a decreased membrane potential

6)which of the following will increase stroke volume: a) reduced activity of cardiac sympathetic nerves, b) increased arterial pressure, c) reduced end diastolic volume, d) low extracellular ca2+, e) increased ventricular filling pressure

Explanation / Answer

3.slow twig muscle fibre these all characters I.e d) a,b& c

4.Lo represents d)none of the above .

Ie Lo represent the active length tension curve for both fibre length and sarcomere length.

5.the latch property of smooth muscle refers to ability of the smooth muscle to maintain c)force in the absence of myosin light chain phoshorylation.

6.c)reduced diastolic volume increase the stroke volume.

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