Soc 14: The Muscular System

Question 1

Deltoid

Answer 1

Move the arm in all directions at the shoulder.

Question 2

Pectoral major

Answer 2

Adduct the arm at the shoulder

Question 3

Latissimus dorsi

Answer 3

Adduct and extend the arm at the shoulder

Question 4

Biceps

Answer 4

Flex the arm at the elbow

Question 5

Triceps

Answer 5

Extend the arm at the elbow

Question 6

External obliques

Answer 6

Pull the chest downwards; flex and rotate the spinal collumn; one side contracting creates a sidebend.

Question 7

Gluteals

Answer 7

Adduct and extend leg at the hips, pull the leg backwards

Question 8

Hip flexors

Answer 8

Flex the hip, help move the leg and knee up towards the body

Question 9

Quadriceps

Answer 9

Extend the leg at the knee

Question 10

Hamstrings

Answer 10

Flex the leg at the knee

Question 11

Gastrocnemius

Answer 11

Point the toes, flex the knee

Question 12

Tibialis anterior

Answer 12

Pull the toes up towards the shin

Question 13

Muscle fibres

Answer 13

make up voluntary (skeletal) muscle; divided into type 1, type lla and type lix

Question 14

Type 1

Answer 14

slow twitch muscle fibres; suited to low intensity work, e.g.
marathon running, as they can be used for a long period without
fatiguing

Question 15

Type lla

Answer 15

fast twitch musde fibres used in anaerobic work; can be improved through endurance training to increase their resistance to fatigue.

Question 16

Type llx

Answer 16

fast twitch muscle fires used in anaerobic work and can generate much greater force than other fibre types, but fatigue quickly.

Question 17

Hyoglobin

Answer 17

a red pigment that transports oxygen to the muscles

Question 18

Antagonistic pairs

Answer 18

muscles that work together to create movement