Gas Movement in Human Body

The following diagram shows the exchange of gases that happens at an alveolus. Label P and Q with the suitable type of gas according to the direction of their movement.

• P is oxygen

• P is Carbon Dioxide

• Q is oxygen

• Q is Carbon Dioxide

The following diagram shows how oxygen is transported in human body. Fill in the blanks with the type of blood that flows in between the alveolus with the heart and the body cells.

• A is Oxygenated blood

• A is Deoxygenated blood

• B is Oxygenated blood

• B is Deoxygenated blood

Oxygen diffuses from the alveolus in the lungs into the blood capillaries as the ______________ of oxygen in the

alveolus is higher.

Oxygen combines with haemoglobin in the red blood cells and forms ___________________.

Oxyhaemoglobin is carried in the blood to the heart to be pumped to body cell. Reaching the body cells, oxyhaemoglobin ______________ to release oxygen.

Oxygen diffuses from the blood into the body cells as the concentration of oxygen in the blood is ____________.

Carbon dioxide diffuses from body cells to the blood as the concentration of carbon dioxide in the body cells is higher. The blood flows back to the heart and then is pumped to the lungs. Reaching the lungs, carbon dioxide diffuses from the blood capillaries into the alveoli to be ___________________ through the exhaled air.

• A is Haemoglobin

• A is Carbon dioxide

• B is Carbon dioxide

• B is Oxygen

_______________ occurs in every living things. The process needs oxygen and gives out carbon dioxide, water and energy.

• Respiration cell

• Digestion

• Transpiration

• Excretion