Disease“He himself bore our sins in his body on the tree, so

that we might die to sins and live for righteousness; by his wounds you have been healed” 1 Peter 2:24

At the end of this lecture you will be able to…

• Identify some diseases• Identify and describe the FACE of

disease• Classify disease into 2 categories• Begin to identify some responses of the

body to infection

Checkpoint 1: Disease

What makes a disease a disease?What are some diseases?

What is disease?• Disease is a condition that

– Function impaired – A series of recognizable symptoms– Cause known– Evaluation for identification

Types of disease• Non-infectious diseases

– Genetic or hereditary e.g. hemophilia– Congenital e.g. fetal alcohol syndrome– Environmental e.g. anemia– Not transmitted by a microorganism– Not contagious

Hemophilia• People are missing the

protein that makes their blood clot

• Bruises become hematomas

• Cuts can be life threatening

Anemia• Lack of iron in the

diet causes reduction in red blood cells

• Tiredness, shortness of breath, heart failure

Checkpoint 2

What are two types of non-infectious diseases? What causes them?

Describe the impact of non infectious disease on our society?

Types of disease con’t …..• Infectious diseases

– Bacterial e.g. cholera– Viral e.g. chicken pox– Fungal e.g. tinnea– Parasitic e.g. malaria– Transmitted by a microorganism– Contagious

Chicken Pox• Spots that become

blisters• Blisters contain fluid• Blisters become

itchy scabs

Cholera• Intestinal infection• Diarrhea and severe

dehydration• Transmitted through

contaminated water or food

Checkpoint 3: Disease

What is an example of an infectious disease? What are some of the symptoms of this disease?

Describe an infectious disease that you have suffered from?

Pathogens• Not all microorganisms

cause disease– Yeast: yoghurt– Micro flora: healthy skin

• Pathogens are microorganisms which cause disease

How are pathogens transmitted?

• In the air• In water• In food• In body fluids e.g. saliva• By touching• By another organism e.g. mosquito• These transmitters are called vectors

How do pathogens make us sick?

• Bacteria produce poisons that kill our cells

• Viruses use our cells to reproduce and then the cell dies

• Fungi grow and produce toxins• Parasites live and grow in our body

destroying tissue

Checkpoint 4: Pathogens

Name a pathogen that you are familiar with. What are its effects?

Describe your journey as a pathogen.

Virus Reproduction

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Parasite Activity• Mosquito Attack• Blood cell penetration• Parasite Release

Body Response• First line of defense

– Physical barriers eg skin• Second line of defense

– Cell attack• Third line of defense

– immunity

Stop the Spread of Disease!• Preventing Infection• Stopping the spread