Oxygen moves from the lungs into the bloodstream through:
nerve fibres
a large artery in the heart
small blood vessels in the lungs
a tube in the lungs called the jugular vein
1. Rich supply of blood vessels2. Thin and delicate 3. Large surface area 4. Kept well outside to absorb oxygen
1. Only very few cells are exposed to the environment. 2. They have high oxygen requirements .3. Their respiration is complex than inactive animals.
Cough and sputum production are the most common symptoms of:
Lung cancer
Emphysema
Chronic bronchitis
Homeostasis
When we breathe in, we inhale many gases, including oxygen. What happens to the gases that the body can't use?
They are exhaled.
They are changed into oxygen by the lungs.
They circulate through the body and are disposed of later.
They are absorbed into the digestive system and used to create energy.
Air can enter the body and travel to the lungs :
through the mouth and the nose.
through the oesophagus and gullet.
through the windpipe and the pores.
through the nose and the nervous system.
What is the respiratory system?
The body's breathing system
The body's system of nerves
The body's food-processing system
The body's blood-transporting system
