13.9 Voluntry And Involuntry Muscles Flashcards

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1
Q

What is syncitium?

A

A multinucleated cell

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2
Q

What is the plasma membrane surrounding a skeletal muscle cell called?

A

Sarcolemma

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3
Q

What are the three types of muscle?

A

Skeletal
Cardiac
Involuntary

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4
Q

Which types of muscle are striated?

A

Skeletal
Cardiac (specialised striated)

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5
Q

Which types of muscle are involuntary?

A

Cardiac
Involuntary

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6
Q

Describe the arrangement of skeletal muscles, and what this does.

A

Regular so the muscle contracts in one direction.
Kind of in lines.

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7
Q

Describe the arrangement of cardiac muscles, and what this does.

A

Cells branch and interconnect, resulting in simultaneous contraction.

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8
Q

Describe the arrangement of involuntary muscles, and what this does.

A

No regular arrangement, so cells can contract in different directions.

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9
Q

Describe the contraction speeds of the three muscle types.

A

Skeletal- short
Cardiac- intermediate
Involuntary- (relatively) long time

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10
Q

Which muscle type is multinucleated?

A

Skeletal

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11
Q

What does uninucleated mean?

A

Only one nucleus in each cell.

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12
Q

Why are skeletal muscle fibres longer than normal cells?

A

Individual embryonic muscle cells fused together, to form them, these share cytoplasm.

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13
Q

What is the cytoplasm in skeletal muscle cells called?

A

Sarcoplasm

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14
Q

What does the sarcoplasmic reticulum contain, in skeletal muscle fibres?

A

Calcium ions- these are required in muscle contraction.

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15
Q

What are skeletal muscles made up of?

A

Bundles of muscle fibres, which are made of myofibrils.

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16
Q

What two types of protein filament do myofibrils contain?

A

Actin
Myosin

17
Q

Briefly describe the structure of actin.

A

Two strands twisted
Thinner

18
Q

Briefly describe the structure of myosin.

A

Long rod-shaped fibres with bulbous heads.
Thicker.

19
Q

What is the H-band in a myofibril?

A

Where there is just myosin.
It is still quite dark but not as dark as the A band.

20
Q

What is the A band in a myofibril?

A

Where myosin and actin overlap.
Very dark.

21
Q

What is the Z line in a myofibril?

A

The thin dark line in the middle of the light zone.

22
Q

What is the I band in a myofibril?

A

Where it is just actin.
Lighter

23
Q

What is the sarcomere in a myofibril?

A

The area between two Z lines

24
Q

Compare and contract slow twitch and fast twitch muscles.

A

Slow: less powerful contractions
Fast: more powerful contractions

Slow: long periods
Fast: short periods

Slow: don’t tire easily
Fast: tire easily

Slow: energy from aerobic respiration
Fast: energy from anaerobic respiration

Slow: red (rich in myoglobin and blood vessels)
Fast: pale (low in myoglobin and blood vessels)

Slow: contain lots of mitochondria
Fast: store lots of creative phosphate