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Unit 1 KA8 - Energy Systems in Muscle Cells

What happens to the muscle cells during vigorous exercise?

They dont get sufficient oxygen to support the electro transport chain

What is pyruvate converted into?

Lactate

What does the conversion of pyruvate into lactate involve?

The transfer of H ions from the NADH produced during glycolysis to pyruvate to produce lactate

This regenerates the NAD needed to maintain... through glycolysis

ATP production

During long periods of vigorous activity...

Lactate accumulates and muscle fatigue occurs

This build up of lactate produces an

Oxygen debt

The oxygen debt is repaid when...

Exercise is complete

What does this allow respiration to do?

Provide the energy to convert lacyate nack to pyruvate and glucose in the liver

Slow twitch muscle fibres contract...

Relatively slowly but can sustain contractions for longer

Slow twitch muscle fibres are useful for endurance activities such as

Long distance running, cycling and cross country skiing.

Slow twitch muscle fibres rely on...

Aerobic respiration to generate ATP

What do slow twitch muscle fibres have many of?

Mitochondria

Slow twitch muscle fibres have a large concentration of the oxygen storage protein... and a large blood supply

Myoglobin

What is the main storage fuel of slow twitch muscle fibres?

Fats

Fast twitch muscle fibres contract

Relatively quicky over short periods

Fast twitch muscle fibres are useful for activities such as

Sprinting or Weightlifting

Fast twitch muscle finres can generate ATP through...

Glycolysis only

What do fast twitch muscle fibres have few of?

Mitochondria

Fast twitch have a lower...than slow twitch muscle fibres

Blood supply

The main store of fuel for the fast twitch fibre is

Glycogen

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