Chapter 7 - Structure and functions of the respiratory system

Which is not a function of the respiratory system?

• Bring air from the atmosphere to the lungs

• Transfer oxygen into the blood

• Transport oxygen to the muscles

• Remove carbon dioxide from the blood

The diaphragm contracts and moves downwards during

• inspiration

• expiration

• ventilation

• diffusion

The site of gaseous exchange in the respiratory system is the

• trachea

• bronchus

• alveoli

• diaphragm

Ventilation is calculated by multiplying

• Heart rate and respiratory rate

• Respiratory rate and vital capacity

• Tidal volume and vital capacity

• Respiratory rate and tidal volume

Diffusion is when gas molecules move from

• An area of high concentration to low concentration

• An area of low concentration to high concentration

• An area of equal concentration

• One capillary to another

The amount of air that can be inspired and expired with each breath is called

• total lung capacity

• vital capacity

• tidal capacity

• tidal volume

During exercise, which muscles work harder to enable increased expansion and contraction of the chest cavity?

• Sternum and ribcage

• Heart and lungs

• Intercostals and diaphragm

• Abdominals and deltoids

The gas that diffuses across the capillary/muscle interface to be expelled from the body after energy production is

• oxygen

• carbon dioxide

• lactic acid

• Myoglobin

Respiratory rate increases during exercise due to the increased demand for

• food fuels

• haemoglobin

• oxygen

• all the above

The main function of the nasal cavity is to

• Warm and moisten the air

• cool and moisten the air

• protect the air

• exchange air and carbon dioxide