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Human Anatomy BIO244 > Muscle > Flashcards

Muscle Flashcards

1
Q

What are the properties of skeletal muscle?

A

Contractility
Excitability
Extensibility
Elasticity

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2
Q

What are the three types of muscle?

A

Cardiac
Skeletal
Smooth

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3
Q

What is the sarcolemma?

A

Covering of the muscle

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4
Q

What is the sarcoplasm?

A

Cytoplasm of the muscle cells

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5
Q

What are myofibrils?

A

Contractile threads of the muscle cells

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6
Q

What is a sarcomere?

A

Structural unit of a myofibril consisting of a dark band and adjective light band (shortens)

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7
Q

What are the two myofilaments?

A

actin

myosin

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8
Q

What is the I band made up of?

A

thin actin (I is a THIN letter)

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9
Q

What is the H band made up of?

A

thick myosin (H is a THICK letter)

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10
Q

What is the M line?

A

Linked myosin filaments

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11
Q

What is the A band?

A

Where myosin and actin overlap

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12
Q

What myofilament has heads?

A

myosin

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13
Q

What does tropomyosin do?

A

reveals attachments sites when calcium binds to troponin

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14
Q

What does troponin do?

A

Calcium binds to it which causes it to move the tropomyosin it is attached to

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15
Q

How does myosin attach to actin?

A

Myosin heads are able to attach when calcium activates the troponin-tropomyosin complex that reveals attachment sites on the actin

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16
Q

How does myosin detach from actin?

A

new ATP binds to myosin heads

17
Q

Where do motor neurons come from?

A

ventral roots

18
Q

What the is the attachment site of a neuron to a muscle?

A

Motor end plate

19
Q

During aerobic exercise, where do muscles source their energy for muscle contraction?

A

muscle glycogen

20
Q

The main factor contributing to muscle fatigue is?

A

lactic acid accumulation

21
Q

The connective tissue that covers the entire muscle is the?

A

epimysium

22
Q

To excite a muscle, the neurotransmitter crosses the synaptic cleft and binds to receptors of the?

A

sarcolemma

Human Anatomy BIO244 (32 decks)

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