Soc 14

Question 1

Deltoids

Answer 1

In the upper part of the body covering the shoulders, raises the arms in all directions in the shoulder

Question 2

Pectoralis major

Answer 2

In the upper part of the chest at the front, adduct the arm at the shoulder

Question 3

Latissimus dorsi

Answer 3

At the back of the body either side of the chest,Pull your arms down at the shoulders behind your back

Question 4

Biceps

Question 5

Voluntary muscles

Answer 5

Voluntary muscles are under your control, you can choose when to contract or relax them. All these muscles are attached to the skeleton via, when you Muscles contract
movement takes place.

Question 6

Involuntary muscles

Answer 6

Involuntary muscles are not under our control. They contract and relax automatically controlled by the involuntary nervous system. They can be found in the digestive organs, circulatory and urinary systems.
The are usually made up of spindle shaped fibres. The involuntary muscles of the blood vessels are especially important for sport. By the muscles contracting and relaxing it helps distribute blood to areas it is most needed.

Question 7

Cardiac muscle

Answer 7

Only found in the wall of the heart it is a very specialised type of involuntary muscle. Cardia muscle is made up of interlaced fibres. These fibres can spread electronical signals from the brain right through the heart so that all the cells can contract together. This regulates your heart rate and means that when you exercise your heart keeps pumping in the right way.

Question 8

Slow twitch fibres (type 1)

Answer 8

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

Question 9

Fast twitch fibre (type 2)

Answer 9

• Type Ila - used in anaerobic work which can be improved through endurance training. Increase their resistance to fatigue.
• Type Ilx - used in anaerobic work than can generate more power that other muscle fibres but fatigue quickly.
• Suit speed events, such as sprinting or jumping (type Ila and type lix) are lighter in colour because they don’t use oxygen for energy.