IGCSE P.E. Ch. 2.2: Mechanics of Breathing

When you are doing strenuous exercise, your body needs

• less oxygen

• more oxygen

• more carbon dioxide

• more lactic acid

Suggest what happens to a performers' breathing rate during exercise.

• Breathing rate increases

• Breathing rate decreases

• Breathing rate remains the same

Describe the Diaphragm.

• a muscular sheet at the base of the chest cavity

• the muscles between the ribs that raise and lower the ribs

• the muscles in the abdominals that support breathing

• the muscles in the lungs that allow for exhalation

Describe the intercostal muscles.

• a muscular sheet at the base of the chest cavity

• the muscles between the ribs that raise and lower the ribs

• the muscles in the abdominals that support breathing

• the muscles in the lungs that allow for exhalation

Suggest one thing that happens to the ribcage during Inhalation (breathing in).

• Moves outwards and upwards as the intercostal muscles contract and lengthen

• Moves inwards and downwards as intercostal muscles relax

• Contracts to become flatter

• Relaxes and domes upwards

Suggest one thing that happens to the ribcage during exhalation (breathing out).

• Moves outwards and upwards as the intercostal muscles contract and lengthen

• Moves inwards and downwards as intercostal muscles relax

• Contracts to become flatter

• Relaxes and domes upwards

Suggest one thing that happens to the ribcage during exhalation (breathing out).

• Moves outwards and upwards as the intercostal muscles contract and lengthen

• Moves inwards and downwards as intercostal muscles relax

• Contracts to become flatter

• Relaxes and domes upwards

Suggest one thing that happens to the diaphragm during exhalation (breathing out).

• Moves outwards and upwards as the intercostal muscles contract and lengthen

• Moves inwards and downwards as intercostal muscles relax

• Contracts to become flatter

• Relaxes and domes upwards

During Inhalation (breathing in) the diaphragm

• Moves outwards and upwards as the intercostal muscles contract and lengthen

• Moves inwards and downwards as intercostal muscles relax

• Contracts to become flatter

• Relaxes and domes upwards

Suggest two things that happen to the lungs during inhalation (breathing in).

• Volume of the lungs decreases

• Volume of the lungs increases

• Pressure in lungs decreases

• Pressure in the lungs increases

• Pressure in the lungs remains the same