digestion, absorption, circulation
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
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