How The Human Body Reacts to Environmental Factors

1. How The Human Body Reacts to Environmental Factors

2. Respiratory System • Reacts to airborne contaminants • Major: • Particulate matter • Carbon monoxide (CO) • Sulphur dioxide (SO2) • Hydrocarbons • smog

3. Respiratory System • Other air-borne contaminants: • VOC’s • Workplace chemicals • Pesticides • Pathogens • Ionizing radiation • Causes atoms to expel electrons and become ions • Fly frequently, work in nuclear energy or with x-rays, lasers • http://www.youtube.com/watch?v=i9dW0k4afCI&NR=1&feature=fvwp Healthbeat - Children & Air Pollution

5. Digestive System • Reacts to contaminants in foods and liquids • Heat and stress may also affect it

6. Digestive System • Many digestive system diseases cause by pathogens • Example: 2008 Listeriosis outbreak across Canada • Unclean meat processing plant equipment

8. Integumentary System • Workplace and household solvents can be absorbed and irritate skin • Example: bleach = burns skin • can be absorbed into blood stream and carried to rest of body

9. Integumentary System • Environmental factors • Hot and cold • UV Rays or ionizing radiation can cause Melanoma (skin cancer) • Poison Ivy = skin rash

11. Circulatory and Lymphatic System • Lymphatic system (immune system): glands, nodes • Leucocytes (white blood cell) protect against pathogens (not all) • Single cell animals (protozoan's, parasites') often survive • Malaria (protozoan) – infected mosquitoe bites • Ionizing radiation and chemicals

12. Circulatory and Lymphatic System • Lymphatic system filters out bacteria and wastes – through lymph nodes and spleen • Lymphocytes (specialized WBC) also do this ~ ionizing radiation and chemicals can damage lymphocytes

14. Nervous System • Brain, spinal cord, nerves • Brain and spinal cord = central nervous system (CNS) • Nerves and pathways = peripheral nervous system (PNS)

15. Nervous System • Peripheral nervous system (PNS) sends impulses to CNS indicating feeling • pleasure, touch, pain, hunger, thirst, sound, smell, sight, and other stimuli • CNS responds by sending command back to muscles, glands, organs in how to respond • Ie. Touch something hot = tells arm to pull away • http://www.youtube.com/watch?v=62dVw7QQVJ8&NR=1Lead Poisoning in Kids

17. Nervous System

18. Urinary and Reproductive Systems • Urinary: rid body of wastes • Kidneys filter blood to remove wastes – excrete urine – bladder – emptied • Both vulnerable to environmental contaminants • Bladder infections/kidney infections

20. Urinary System