B1.1
- Created by: Meganallam
- Created on: 14-05-17 20:27
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- B1.1
- Diet and Exercise
- water = carries nutrients, removal of waste and regulates body temp.
- metabolic rate = the rate at which all the chemical reactions in the cells of the body are carried out
- metabolic rate is affected by: amount of activity, proportion of muscle to fat, inherited factors
- How our bodies defend themselves against infectious diseases
- A pathogen is a microorganism that causes infections diseases
- bacteria and viruses may reproduce rapidly inside the body and may produce toxins that make us feel ill
- viruses damage the cell in which they reproduce
- white blood cells produce antibodies that target a specific bacteria or virus. Each type of pathogen needs a unique antibody.
- antitoxins counteract the toxins released by the patjogen
- Semmelweis recognised the importance of hand washing in the prevention of spreading infectious disease
- Painkillers help to reduce the symptoms of infectious disease but do not kill the pathogens.
- Antibiotics help to cure bacterial diseases by killing infectious bacteria inside the body.
- they cannot be used against viral pathogens which live and reproduce inside cells
- we can reduce antibiotic resistance by avoiding unnecessary overuse
- mutations of pathogens may produce new strains.
- vaccinations may no longer be effective. the new strain will then spread rapidly
- a vaccination is introducing small quantities of dead or inactive pathogens into the body.
- vaccines stimulate the white blood cells to produce antibodies to destroy the pathogens.
- Diet and Exercise
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