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The blood absorbs oxygen from the air and gives up the waste product (carbon dioxide) into the
alveoli, from where it is exhaled as the lungs contract. This process is termed the gaseous exchange.
The oxygen-enriched blood is returned to the heart from where it is pumped around the body.
The Digestive System
The digestive tract is made up of the mouth, esophagus, stomach, large and small intestine,
colon and rectum.
Food and water pass into the stomach for digestion. They then pass to the small intestine
where nutrients and energy from the food are absorbed into the blood stream and distributed
around the body. Almost all absorption into the body takes place in the small intestine.
Undigested matter and water pass to the large intestine where most of the water is
absorbed into the bloodstream. Waste material finally passes to the rectum and is expelled
from the body.
The Digestive System.
The Cardiovascular System
The heart pumps blood, which consists of plasma, red, and white blood cells, around the body.
The plasma assists in the clotting and scar forming (fibrosis) processes. The red blood cells
POSHE V2| Unit IG2 – Element 7 – Chemical and Biological 8
Agents
