1. Causes Of Disease Flashcards

You may prefer our related Brainscape-certified flashcards:
0
Q

For a microorganism to be considered a pathogen it must…

A

Gain entry to the host
Colonise host tissues (infection)
Resist the defences of the host
Cause damage to the host tissues

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Microorganism

A

A single called organism which is too small to be seen without a microscope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When a pathogen is transferred from one individual to another

A

Transmission

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Common points of entry for pathogens are…

A

The gas exchange system (surfaces) e.g influenza, tuberculosis and bronchitis.
The digestive system. (Food and water, into the stomach and intestines via the mouth) e.g Cholera, typhoid and dysentery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

To prevent entry of pathogens the body has a number of natural defences…

A

A mucous layer that covers exchange surfaces and forms a thick sticky barrier which is difficult to penetrate.

The production of enzymes which break down the pathogens.

The production of stomach acid, which kills microorganisms.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Pathogens affect the body in two main ways:

A

By damaging host tissues (the sheer number of pathogens causes damage e.g by preventing tissues from functioning properly) (inhibiting DNA synthesis and breaking down host cell membranes).

By producing toxins e.g the cholera bacterium produces a toxin that leads to excessive water loss from the intestine lining.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What factors can cause disease?

A

Pathogens, lifestyle and genetic factors.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a pathogen?

A

A microorganism that causes disease.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Why are the digestive systems often the sites of entry for pathogens?

A

Diffusion takes place in these systems so they have a large surface area, are thin, moist and well supplied with blood vessels. This makes it easy for pathogens to attach to and penetrate them.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why are oral antibiotics not used to treat diarrhoea.

A

Because they do not stay in the digestive system long enough to be absorbed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

A correlation but not a causal relationship.

A

The data seems to suggest that this is the case but there is no actual evidence to prove it. (To prove you would need experimental evidence to show that the variable led directly to the issue).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is risk?

A

A measure of the probability that damage to health will occur as a result of a given hazard.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Factors which increase/decrease risk…

A

Stress levels, alcohol intake, occupation, gender, pollution, age, genetics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Lifestyle factors which contribute to cancer:

A
Smoking
Diet
Obesity
Physical activity
Sunlight
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Lifestyle factors contributing to CHD:

A
Smoking
High blood pressure
Blood cholesterol levels
Obesity
Diet
Physical activity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly