What is the role of troponin and tropomyosin? What is recruitment in terms of mu

Question

What is the role of troponin and tropomyosin?

What is recruitment in terms of muscle contraction?

In what order are muscle fibers recruited during muscle contraction?

What affects the velocity and duration of a muscle contraction?

What is the function of the sarcoplasmic reticulum (SR)?

What is the latent period?

What are the 3 pathways that muscle cells can use to create ATP?

What is produced in a muscle cell when there is no oxygen available?

What is ATP?

What are the fibrous layers surrounding muscle tissue both externally and internally?

Why does rigor mortis occur?

What is a sarcomere?

What is the refractory period?

Explanation / Answer

Troponin and tropomyosin regulate contraction of muscles via Calcium binding. In relaxed muscle tropomyosin blocks attachment site for myosin cross bridge and thus prevents contraction.

Muscle fibres are recruited from smallest to largest during muscle contraction.

Velocity and duration of muscle contraction is effected by LOAD (high load low contraction) and muscle fibre type.

Sarcoplasmic reticulum is a specialised type of smooth ER that regulates Can ion concentration in cytoplasm of striated muscle cells.

The time between stimulus to nerve and contraction of muscle is called latent period.

Muscle cells use creatinine phosphate, anaerobic cellular respiration and aerobic cellular respiration to create ATP.

When there is no oxygen muscle cells produce Lactic acid.

ATP is a energy source obtained from coupled reaction of creatinine phosphate and ADP.

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