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Science for Med Revision > Muscles 2 > Flashcards

Muscles 2 Flashcards

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1
Q

What are the two classifications of muscle fibres?

A
  • Oxidative

- Glycolytic

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2
Q

What are the 2 types of oxidative fibres?

A
  • Slow

- Fast

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3
Q

Mitochondrial levels in oxidative fibres?

A

High

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4
Q

Which of the two fibres are more vascularised

A

Oxidative

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5
Q

What is the diameter of oxidative fibres?

A

Low

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6
Q

What is the function of slow oxidative fibres?

A

Resisting fatigue

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7
Q

Relative ability to resist fatigue of fast ox fibres?

A

Intermediate

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8
Q

Mitochondrial levels in glycolytic fibres?

A

Low

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9
Q

What do glycolytic fibres have a high number of?

A
  • Glycolytic enzymes

- Glycogen

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10
Q

Diameter of glycolytic fibres?

A

High

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11
Q

Relative ability to resist fatigue of glycolytic fibres

A

Bad

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12
Q

Where is smooth muscle found in the body?

A
  • Airways
  • Sphincters
  • GI tract
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13
Q

What is smooth muscle controlled by?

A
  • ANS
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14
Q

Arrangement of actin and myosin in smooth muscle?

A
  • Diagonally
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15
Q

How are actin and myosin anchored to membranes in cardiac muscles?

A

Dense bodies

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16
Q

What does calcium bind to when it is released from the sarcoplasmic reticulum in smooth muscle?

A

Calmodulin

17
Q

What does calmodulin bind to?

A

Myosin light chain kinase

18
Q

What is the function of myosin light chain kinase?

A

Phosphorylates myosin using ATP

19
Q

What enzyme allows relaxation?

A

Myosin light chain phosphatase

20
Q

How does myosin light chain phosphatase work?

A

Dephosphorylates the myosin cross bridges, causing them to unbind

21
Q

What does the action of myosin light chain kinase allow in regards to contraction in smooth muscle?

A

Sustained contraction

22
Q

Why does the action of myosin light chain phosphatase allow a longer contraction?

A

Less ATP is used in the contraction on a whole

Science for Med Revision (29 decks)

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