1. which muscle type is said to be thick filament regulated? a) skeletal b) card

Question

1. which muscle type is said to be thick filament regulated?
a) skeletal b) cardiac c) smooth d) both a and b

2. which muscle type is said to be thin filament regulated?
a) skeletal b) smooth c) neither a or b   d) both a and b

3. at rest, the sarcollema is most permeable to
a) sodium ions b) potassium ions.            c) calcium ions d) all of these

4. during depolarization in skeletal muscle, the sarcollema is most permeable to
a) sodium ions b) potassium ions
c) calcium ions d) chloride ions

5. during repolarization in skeletal muscles like, the sarcollema is most permeable to
a) sodium ions b)potassium ions
c) calcium ions d) chloride ions

Explanation / Answer

3) at rest, the sarcollema is most permeable to Potasium Ions.The K+channels are kept open during rest.

4)During depolarization in skeletal muscle, the sarcollema is most permeable to sodium ions. As sodium ions diffuse rapidly , resting potential is decreased leading to depolarization.

5) During repolarization, the sarcolemma is most permeable to K+ ions. The Na+ channels close and allow K+ diffusion.

After repolarization, the ionic concentration is restored by Na+/K+ pump.

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