Circulatory System 1.Heart 2. Blood vessels 3. Blood

Circulatory System

1. Heart2. Blood vessels3. Blood

• Heart pumps blood through blood vessels to lungs

• In lungs, red blood cells loaded with oxygen

• Arteries carry oxygen rich blood to body

• Arteries divide into capillaries

• In capillaries, blood cells drop off oxygen and nutrients and collect waste products including carbon dioxide

• Blood travels back to the heart and lungs through veins

• Red blood cells deposit carbon dioxide in the lungs

Blood is a mixture of plasma and three different types of blood cells:

1. Red blood cells (carry oxygen to body)

2. White blood cells (fight disease)

3. Platelets (stop bleeding)

CLOGGED ARTERIES• Fat in blood sticks to side of arteries, limits amount of blood that can pass

through• Can cause high blood pressure, stroke or heart attack

HEART ATTACK

HEART ATTACK

LYMPHATIC SYSTEM• Produces white

blood cells that fight germs and infections

• Traps foreign particles

• White blood cells are transported through body in a pale fluid called lymph

LYMPH NODES• Oval tissue• Filled with white blood

cells• In strategic locations

(neck, abdomen, groin, armpits)

• Filter and destroy foreign matter like bacteria

• When they are fighting they swell up

LYMPHATIC SYSTEM

• White blood cells are created in bone marrow

• Tonsils prevent germs from entering your body through your throat

COMMUNICABLE AND NONCOMMUNICABLE DISEASE

Noncommunicable disease can’t be spread directly from person to person:

• Hereditary diseases• Poor nutrition• Risky behaviors (ie:

smoking)

COMMUNICABLE AND NONCOMMUNICABLE DISEASE

Communicable disease can be spread directly from person to person. Is contagious.

• Epidemic: a disease that is spreading rapidly

• Diseases from humans/animals• Ex: Cold, flu, rabies• Can be spread by coughing,

sneezing, touching, sharing drinking glasses and eating utensils

• Can be due to bacteria or viruses

Bacterial diseases

Bacteria are tiny organisms that cause disease. Examples:

• Tetanus• Tuberculosis• Typhoid fever

Viral diseases

Viral diseases are caused by tiny organisms called viruses.

They invade living cells and inject their DNA into the host cells.

Examples:• Common cold• Chicken pox• Rabies• Mononucleosis• Polio

Bacteria and viruses invade the body, this activates the immune system

• Antibodies are produced to defeat a specific bacteria or virus

• An Antigen is a specific chemical label that the antibody can attach to, it fits like a lock and key

ANTIBIOTICS• Antibiotics are

drugs that kill bacteria

• Penicillin is an antibiotic

• It was discovered by Dr. Alexander Fleming in 1928

• Antibiotics do not kill viruses

VACCINES

• A vaccination protects people against a disease by stimulating the body to produce antibodies

• Not all diseases have vaccines yet, such as AIDS caused by HIV