BIOL 5 - MUSCLES

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Muscle fibre cell surface membrane
Sarcolemma
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Myofibrils
Protein strands which cause contraction
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I Band
Just actin
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A Band
Actin and myosin
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H Zone
Just myosin
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Actin
Thin filament, has binding sites for myosin which are covered by TROPOMYOSIN when the muscle is relaxed
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Myosin
Thick filament, head of myosin extends out and contains ATP and ATPase on the actin binding site
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Calcium ions released from the _____
Sarcoplasmic reticulum
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Role of calcium ions
Bind to tropomyosin and move it from the binding site, activate the ATPase
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ATPase role
Hydrolyses the ATP on the binding site so a cross bridge can form between actin and myosin - also provide the energy for power stroke
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I band during contraction
Narrows
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A band during contraction
Stays the same
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Outer edges of the dark bands during contraction
Widens
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H zone during contraction
Narrows
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Neurotransmitter released at motor end plate
Always acetylcholine
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EPPs
End plate potentials
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Action potential travels down the ____ which connect to the ________
T-tubules which connect to the sarcoplasmic reticulum
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Acetylcholine is broken down by ________ and is _______
Acetylcholinesterase and actively transported back to the pre synaptic membrane
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Slow muscle fibres
Contract slowly, many mitochondria, aerobic respiration, high resistance to fatigue, myoglobin, low stores of glycogen
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Fast muscle fibres
Contract quickly, few mitochondria, anaerobic respiration, low resistance to fatigue, many glycogen stores, no myoglobin
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3 METHODS OF ENERGY SUPPLY DURING CONTRACTION
1)Aerobic respiration 2)Anaerobic 3)Phosphocreatine system
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Equation for ATP/CP System
Phosphocreatine + ADP = ATP + Creatine
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Other cards in this set

Card 2

Front

Myofibrils

Back

Protein strands which cause contraction

Card 3

Front

I Band

Back

Preview of the front of card 3

Card 4

Front

A Band

Back

Preview of the front of card 4

Card 5

Front

H Zone

Back

Preview of the front of card 5
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