Muslces

Question 1

What are muscles

Answer 1

Soft tissue, which can contract to maintain a position in the body or produce movement

Question 2

Muscle structure

Answer 2

Made up of muscle fibres (cells)

These fibres are made up of myofibril

Myofibril thin actin filaments and thick protein myosin filaments

Sacromere are repeated unites of thin actin filaments and thick protein myosin filaments. This is the basic unit for muscle contraction

Question 3

Muscle Contraction

Answer 3

When muscle contracts, thin actin filaments moves between thick protein myosin filaments, shortening length of sarcomere and overall muscle

Question 4

Two type of muscle fibres

Answer 4

Fast twitch and slow twitch

Question 5

Fast twitch muscles

Answer 5

• Rapid intense contractions in short bursts
• Few mitochondria-energy for contraction from anaerobic respiration (needs no oxygen)
• Few capillaries
• Tires easily
• Little stored oxygen and glucose

Question 6

Slow twitch muscles

Answer 6

• Slow, sustained contraction for long period of exercise
• Many mitochondria-supplies energy from aerobic respiration (requires oxygen)
• Lots of capillaries
• Does not tire easily
• Large oxygen and glucose stores