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CSC1005 - Integrated Human Physiology > Smooth Muscle VS Skeletal Muscle > Flashcards

Smooth Muscle VS Skeletal Muscle Flashcards

1
Q

What is contained in smooth muscles?

A
  • Thick myosin filaments
  • Thin actin filaments
  • Tropomyosin
  • No troponin
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2
Q

What are actin filaments anchored to in smooth muscle?

A

Plasma membrane
OR
Dense bodies

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3
Q

Are actin and myosin organised or not organised into myofibrils in smooth muscles?

A

Not organised

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4
Q

Are actin and myosin organised or not organised into myofibrils in skeletal muscles?

A

Organised

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5
Q

Why are smooth muscles not organised?

A

No sarcomeres - non striated pattern

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6
Q

What initiates the contraction in smooth and skeletal muscles?

A

Ca 2+

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7
Q

Where are Ca 2+ released from in the smooth muscle?

A

The sarcoplasmic reticulum and extracellular

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8
Q

How do extracellular Ca2+ enter?

A

Via L-type channels

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9
Q

How do sarcoplasmic reticulum release Ca2+?

A

Small invaginations called Caveolae

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10
Q

What are the similarities between smooth and skeletal muscles?

A
  • Both contractile
  • Actin and myosin
  • Ca2+ trigger
  • ATP required
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11
Q

Which muscle is redder skeletal or smooth?

A

Skeletal

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12
Q

Why is skeletal much redder than smooth muscle?

A

High levels of stored myoglobin

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13
Q

What colour is smooth muscle?

A

Pale-white

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14
Q

Which muscle is more efficient in contraction relating to energy?

A

Smooth

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15
Q

Do contractions happen faster in skeletal or smooth muscles?

A

Skeletal

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16
Q

Which muscle is striated?

A

Skeletal

17
Q

Which muscle goes in all different directions?

A

Smooth muscles

18
Q

Which muscle goes in one direction?

A

Skeletal

19
Q

What does Ca2+ activate in skeletal muscle?

A

Troponin

20
Q

What does Ca2+ activate in smooth muscle?

A

Calmodulin

21
Q

Where does Ca2+ come from in skeletal muscle?

A

Sacroplamic reticulum

22
Q

Where does Ca2+ come from in smooth muscle?

A

Mainly from extracellular fluid

23
Q

What does troponin activate?

A

tropomyosin

24
Q

What does calmodulin activate?

A

MLCK

CSC1005 - Integrated Human Physiology (18 decks)

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