Soc 14: Muscular System

Question 1

Deltoids + Pectorals

Answer 1

Deltoids: abducts upper arm at the shoulder
Pectorals: adduction of upper arm at the shoulder

Question 2

Triceps + Biceps

Answer 2

Triceps: extends lower arm at the elbow
Biceps: flexes arm at the elbow

Question 3

Quadriceps + Hamstrings

Answer 3

Quadriceps: extends the leg at the knee
Hamstrings: flexes the leg at the knee

Question 4

Tibialis anterior + Gastrocnemius

Answer 4

Tibialis anterior: Dorsi-flexion at the foot
Gastrocnemius: Plantar-flexion at the foot

Question 5

Gluteus maximus + Hip flexors

Answer 5

Gluteus maximus: extends the leg at the hip
Hip flexors: flexes the leg at the hip

Question 6

Slow twitch (type 1) muscle fibres

Answer 6

Suit endurance activities - can work for longer periods of time
They’re darker in colour because they contain myoglobin, a red pigment that transports oxygen to the working muscles

Question 7

Fast twitch (type 2) muscle fibres

Answer 7

Type 2a - used in anaerobic work which can be improved through endurance training. Increase their resistance to fatigue.
Type 2x - used in aerobic work which can be improved through endurance training