DMD - L1

Question 1

Topics?

Answer 1

Muscle structure
Muscle function
Metabolism
Types of muscle fibre

Question 2

Describe the structure of muscle

Answer 2

-

Question 3

Describe the structure of sarcomeres

Answer 3

HIMAZ

Question 4

Explain the sliding filament theory

Answer 4

-

Question 5

Explain the cross-bridge cycle

Answer 5

-

Question 6

What is dystrophin?

Answer 6

-

Question 7

Where can ATP be obtained from?

Answer 7

within the fibre
creatine phosphate
glucose in the cell (as glycogen)
glucose & fatty acids from blood

Question 8

Describe aerobic and anaerobic respiration

Answer 8

-

Question 9

Describe the energy source graph

Answer 9

-

Question 10

Type I muscle fibres?

Answer 10

red fibres, slow oxidative, slow twitch, fatigue resistant
contain:
large amount of myoglobin, many mitochondria
many blood capillaries
generate A TP aerobically (oxidative)
split ATP at a slow rate
slow contraction velocity, resistant to fatigue
found in large numbers in postural muscles
needed for aerobic activities like long distance running

Question 11

Type IIA muscle fibres?

Answer 11

red fibres, fast oxidative, fast twitch, fatigue resistant
contain:
large amount of myoglobin, many mitochondria, many capillaries
high capacity for generating ATP by oxidation. Split ATP at a very rapid rate, hence, high contraction velocity o resistant to fatigue but not as much as slow oxidative fibres
needed for middle distance running and swimming

Question 12

Type IIB muscle fibres?

Answer 12

white fibres, fast glycolytic, fast twitch
• contain:
o low myoglobin content, few mitochondria, few capillaries
o large amount of glycogen, split ATP very quickly, anaerobic glycolysis o fatigue easily
o needed for explosive sports like sprinting