Physiology of Muscle Contraction

What is the name given to a single muscle cell?

• Sarcolemma
• Sarcomere
• Myocyte
• Contractile element

What is the name of the thin contractile filament found in a sarcomere?

• actin
• myosin
• titan
• troponin

What is the name of the thick contractile filament found in a sarcomere

• actin
• myosin
• troponin
• titin

When a muscle is relaxed and in a lengthened position, what is the relationship between actin filaments?

• They are on top of one another
• They are beside each other
• They are close to each other
• They are far apart from each other

When a muscle is in a contracted position, what is the relationship between actin filaments?

• They are on top of one another
• They are beside each other
• They are close to each other
• They are far apart from each other

What is the name given to the contraction and relaxation of a sarcomere?

• Muscle contraction
• Passive lengthening
• Sliding filament theory
• Isometric contractions

How does the sarcomere shorten (contract)

• The myosin filaments contract
• The actin filaments contract
• The the actin is pulled by the myosin.
• The myosin is pulled by the actin.

What is the sarcolemma?

• The outside covering of a muscle cell
• Tubes within the cell that conduct an impulse
• A storage area for calcium
• A storage area for sodium

What is the purpose of a T tubule?

• It transports sodium
• It transports calcium
• I takes the impulse (action potential) to the inside of the muscle cell.
• It relaxes the muscle cell

What do mitochondria do in a muscle cell?

• Store glucose
• Create ATP
• Use ATP
• Release calcium

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