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MCAT Biology > Musculoskeletal > Flashcards

Musculoskeletal Flashcards

1
Q

Sarcomere

A

The contractile unit of the fibers in skeletal muscle and contains thin actin and thick myosin filaments

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2
Q

Initiation of Contraction

A

depolarization of a neuron leads to an action potential

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3
Q

Sarcomere Shortening

A

SR releases calcium ions
Ca2+ binds to troponin on the actin filament
Tropomyosin shifts, exposing myosin-binding sites
Myosin binds, ATPase activity allows myosin to pull thin filaments towards the centre of the H zone and then ATP causes dissociation

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4
Q

Relaxation

A

Ca2+ is pumped back into the SR

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5
Q

Osteoblast

A

builds bone

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6
Q

Osteaclast

A

breaks down bone

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7
Q

Reformation

A

inorganic ions are reabsorbed from the blood for use in bone

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8
Q

Degradation (resorption)

A

inorganic ions are released into the blood

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MCAT Biology (14 decks)

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