Digestion, Absorption, Circulation

Consuming Food and Drink

• Ingestion – the process of eating or drinking

• Digestion – breaking down food into small pieces in order to absorb nutrients

Digestive System

Digestive System

Food ingested at the mouth

Digestive System

Food broken down in the stomach

Digestive System

Nutrients absorbed into bloodstream through capillaries in small intestine

Ingested/Digested ContaminantsDisease causing micro-organisms from contaminated food• Escherichia Coli (E. Coli)

– Inflamed stomach and intestine– Severe fatal infection

• Listeria monocytogenes– Listeriosis, an infection of central nervous system which can be fatal – Maple Leaf Foods recall (2008) 23 deaths in Canada

Workplace chemicals • Cleaners, pesticides

– Heavy metal poisoning

E Coli

Protection from Contaminants

• Vomiting– Forced removal of contents of stomach and small

intestine– Not all contaminants removed

• Liver– Filters blood to remove contaminants– Can only filter a limited amount

Skin and Absorption

Epidermis (surface)Dead cells with growing cells underneath, and hair shafts

Dermis contains capillaries and nerves that let you “feel”, and sweat glands to cool

Subcutaneous layer consists of fat cells to insulate body from cold

Absorbed ContaminantsOils, tars, alcohols and pesticides• absorbed through capillaries in dermis

Ultraviolet rays or radiation can lead to melanoma

Cleaners and workplace chemicals can lead to eczema, skin cancer

Skin rash from exposure to contaminant

Melanoma, skin cancer

Circulatory System:

Spreading Contaminants

• Blood is circulated around the entire body by the heart

• Contaminants absorbed through lungs, digestion, or skin are also circulated around the entire body

• Contaminants entering the body at one place can effect a completely different organ

Malaria• Disease transmitted

by mosquito bite

• Micro-organism spreads throughout the body to the liver, and then infects red blood cells

Control Practices by air