Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

Health- `a state of complete physical, mental
and social wellbeing and not merely the
absence of disease and infirmity'
· Disease- `anything that impairs the normal
functions of the body.'…read more

Slide 3

Preview of page 3

Here's a taster:

Parasites and pathogens
· Infectious diseases are ones we can catch from
someone else. These are caused by pathogens.
· Pathogens are a kind of parasites.
· This is an organism that lives in a very close
relationship to another organism, its host, and does
it harm.
· Pathogens fit into four different groups.
1. Viruses
2. Bacteria
3. Fungi
4. Protozoa…read more

Slide 4

Preview of page 4

Here's a taster:

Tuberculosis
· Mycobacterium tuberculosis.
· Enter the body by you breathing in droplets of
moisture that have been exhaled by an infectious
person.
· Not very infectious, you need to be around an
infected person for a long time. Therefore most
people catch it when sleeping in crowded
conditions.
· Chances also increased by
1. HIV
2. Malnutrition (lack of proteins and minerals)
3. Having a weakened immune system.
· The most commonly affected organ is the lungs.…read more

Slide 5

Preview of page 5

Here's a taster:

If the bacteria reaches the alveoli of the lungs,
macrophages engulf them.
· However even though they are engulfed, they
are not destroyed and remain undamaged in the
white blood cells.
· They divide releasing new bacteria.
· These are engulfed by other white blood cells.
· Slowly more and more cells are infected with
the bacterium.…read more

Slide 6

Preview of page 6

Here's a taster:

In about 90% of people with TB, their immune
system is able to contain the growth of the
bacteria and the person develops no
symptoms.
· However they can cause tissue damage to the
lungs and other parts of the body. Symptoms..
· Loses weight
· Suffers night sweats
· coughs, eventually bringing up blood stained
mucus and pus.…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »