The Breathing system

The trachea is kept open by rings of

What is the flap of tissue which prevents food entering the trachea called?

The hairs lining the air pipes which move the mucus into the oesophagus are called ...........?

The large surface area needed for gaseous exchange is provided by the ............?

The red pigment ................... carries about 97% of the oxygen in our red blood cells

Breathing rate is controlled by the concentration of ................... dissolved in blood?

• Oxygen

• Carbon dioxide

• Nitrogen

• Water vapour

Which contains the greater percentage of water vapour – inhaled air or exhaled air?

• inhaled

• exhaled

Where in the body is the concentration of carbon dioxide monitored?

Each lung is enclosed by a pair of ..................... membranes, which are separated by a cavity.

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi
• lungs
• oxygen
• alveoli

Tags

NGSS.HS-LS2-3