ch 10 pt 9 anatomy Flashcards by Maya Huggler

Q

Relaxation of smooth muscle is caused by

A

Removal of Ca2+ from sarcoplasm

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Q

What is latchbridge mechanism?

A

Myosin and actin hold onto each other

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Q

ANS secretes transmitter

A

Contracts in response to ACh and relaxes in response to norepinephrine

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Q

What is myogenic response?

A

Contraction in reaction to stretch

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Q

What is multiunit smooth muscle?

A

Contract individually

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Q

What is stress-relaxation response?

A

Is relaxation after prolonged stretch

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Q

1st step of smooth muscle contraction

A

Opening of voltage-gated Ca2+ channels

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Q

2nd step of smooth muscle contraction

A

Binding of Ca2+ to calmodulin

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Q

3rd step of smooth muscle contraction

A

Activation of myosin light-chain kinase

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Q

4th step of smooth muscle contraction

A

Activation of myosin head

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Q

5th step of smooth muscle contraction

A

Crossbridge formation, power stroke, reattachment

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