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Cell Biology > Muscle Tissue > Flashcards

Muscle Tissue Flashcards

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1
Q

How many nuclei do skeletal muscles have?

A

More than 100
Multinucelated

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2
Q

What kind of appearance do skeletal muscles have?

A

Striated appearance
Striations formed on sarcomere

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3
Q

What is the unit of contraction of skeletal muscles?

A

The sarcomere

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4
Q

What are the characteristics of skeletal muscle contractions?

A

Strong and organized
Short duration (fraction of a second)
Voluntary

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5
Q

How many nucleus are on smooth muscle?

A

One on each cell
Uninucleated

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6
Q

What kind of appearance do smooth muscles have?

A

Smaller
Delicately tapered
No striations

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7
Q

What is the unit of contraction for smooth muscles?

A

The cell itself

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8
Q

What are the characteristics of smooth muscle contraction?

A

Slow
Weak
Disorganized
Long duration (5 seconds)
Involuntary

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9
Q

What are dense bodies?

A

Dark protein plate anchored to inside surface of plasma membrane

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10
Q

What kind of filaments are found in smooth muscles?

A

Intermediate filaments
Actin and myosin interconnect between dense bodies

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11
Q

What kind of filaments are found in smooth muscles?

A

Intermediate filaments
Actin and myosin interconnect between dense bodies

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12
Q

How many nuclei do cardiac muscles have?

A

One on each cell
Uninucleated

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13
Q

What kind of appearance do cardiac muscles have?

A

Striations formed by sarcomere
Short
Highly branched fibers

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14
Q

What is the unit of contraction for cardiac muscles?

A

Sarcomere

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15
Q

What are the characteristics of cardiac muscle contraction?

A

Strong
Organized
5-second duration
Involuntary

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16
Q

What are intercalated disks?

A

Dark, squiggly lines on cardiac muscles
The plasma membrane of adjacent cells interlocks
So… separate cardiac muscle cells are connected by intercalated disks

17
Q

What is the overall skeletal muscle structure… direction??

A

Muscle cell
Skeletal muscle cell/muscle fiber
Parallel bundles of myofibrils
Individual myofibrils
Sarcomere

18
Q
A

Cell Biology (11 decks)

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