Human defences

Question 1

Generally what are some ways to prevent diseases

Answer 1

Hygeine-Washing your hands throughly
Destroy vectors-By destroying vectors habitats and using insectides diseases will not be spread
Isolation-Through this the disease cannot be spread
Vaccination-This allows for people to catch the disease and pass it on

Question 2

What are vaccines

Answer 2

Vaccines are** injections of dead or inactive pathogens.** They prepare your body to produce antibodies to protect your body. If the live pathogen appears again then the body will be able to quickly produce white blood cells

Question 3

Pros and cons of vaccines

Answer 3

Pro is that they control lots of diseases like smallpox and measels. Epidemics can be prevented if a large population of the country is vaccinated
Con is vaccines dont always develop an immunity. sometimes they develop a bad reaction.

Question 4

How does the skin and mucus protect the body

Answer 4

The skin acts as a barrier against pathogens and secretes antimicrobial substances.
Mucus traps pathogens in your nose and trachea. It is more effcient than your hairs.

Question 5

What are the two types of white blood cells and what are there functions

Answer 5

Lymphocytes can recognise foreign antigens on pathogens then** they release antibodies that latch onto the antigens.
They produce antitoxins which counterract toxins made by bacteria.
Phagocytes engulf pathogens which is called phagocytosis.**

Question 5

How does cillia and the stomach protect the body

Answer 5

Cillia are hair like cells that waft mucus up the trachea which leads to sneezing out the pathogens.
The stomach produces hydrocholric acid which kills pathogens