T1 U9 Skeletal muscle activity Flashcards

1
Q

What are the functional characteristics of skeletal muscle

A

Excitability
Contractility
Extensibility
Elasticity

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2
Q

What is a motor unit

A

One neuron + all skeletal muscle cells

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3
Q

Name the path a stimulus travels

A

Axon -> Axon terminal -> Neuromuscular junction -> Vesicles -> Neurotransmitter -> ACH

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4
Q

Name the order of the 4 phases of Skeletal muscle contraction

A

Cross-bridge attachment
Working / power stroke
Cross-bridge detachment
Cocking myosin head

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5
Q

Explain sliding filament theory

A

Muscle fibres activated and myosin heads attach to binding sites and sliding begins

Each attachment and detachment causes tension generation which helps pull thin filaments toward centre of sarcomere

Cell shortens but not myofilaments

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6
Q

Describe the graded response contraction

A

Whole muscle reacts to stimuli in 2 ways

  • change frq of muscle stimuluation
  • Change number of muscle cells stimulated at one time
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7
Q

3 ways of ATP regeneration

A

1) direct phsoporylation
2) aerobic respiration
3) Anaerobic glycolysis

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8
Q

What causes muscle fatugue

A

Strenuous or prolonged exercise. Occur b/c O2 deficit causing lactic acid build up causing a decrease in ATP

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9
Q

Effects of Aerobic execise

A

Incr. blood supply
Incr. metabolism
heart enlarges
more efficient lungs

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10
Q

Effects of Resistance execise

A

Incr. muscle size + strength

Incr. muscle cell size

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