OCR GCSE PE The respiratory system

Finish the sentence. When we expire (breathe out)...

• The diaphragm and the intercostals contract and lift the ribcage up and out increasing the size of the thoracic cavity

• The diaphragm and the intercostals relax causing the rib cage to drop, therefore reducing the size of the thoracic cavity.

What structures does gaseous exchange take place between? (select 2 answers)

• Alveoli and the veins

• Alveoli and the capillaries

• Capillaries and the arteries

• Capillaries and muscle tissue

Which is the odd one out? Gaseous exchange is aided by...

• Alveoli is covered in capillaries

• A large blood supply

• walls one cell thick

• Valves

Tidal volume is the volume of air inspired or expired per breath. This increases during exercise. ​

• True

• False

Minute ventilation is the amount of air a person breathes out in a minute

• True

• False

Select each statement that refers to anaerobic exercise.

• Uses oxygen

• High intensity

• Short duration

• Builds up lactic acid

• Long duration

Why does breathing rate increase during exercise? Tick the statements that are relevant.

• To meet the demand for oxygen at the working muscles

• To make us lighter

• To decrease body temperature

• To remove carbon dioxide from the body

Does a tour de France cyclist work generally work aerobically or anaerobically?

• Aerobically

• Anaerobically

'The number of breaths per minute' is the definition for...

• Cardiac output

• Lung capacity

• Breathing rate

• Tidal volume

During inspiration, the pressure inside the thoracic cavity decreases.

• True

• False