Skeletal Muscle

Question 1

What joins a muscle and skeleton and what is it made of?

Answer 1

Tendon made of collagen fibres

Question 2

Describe the 2 types of contraction

Answer 2

Isotonic: concentric-muscle shortens
Eccentric-muscle lengthens

Isometric; muscle exerts force without changing length, postural muscles

Question 3

What joins muscle fibres and tendons

Answer 3

Myotendinous junction

Question 4

What are the layers that wrap a muscle fibre

Answer 4

Epimysium - perimysium - endomysium

Question 5

What is the cell that is a stem cell for muscle tissues?

Answer 5

Satellite cells

Question 6

List the muscle fibre types

Answer 6

1 slow oxidative
2a fast oxidative
2b fast glycolysis

Question 7

What gene has a mutation that causes muscular dystrophy and what are the effects?

Answer 7

Dystrophin gene on X chromosome, has structural role in stabilising sarcolemma during contraction

Question 8

What is the name of precursor regulator cells that become muscle cells?

Answer 8

MRFs myogenic regulatory factors