YOUR CIRCULATORY SYSTEM

How does it work?

Why does a doctor check your pulse and blood pressure?

What is your blood type and why is it important?

The Transport System

• CIRCULATORY SYSTEM– Your body’s transport system.– Keeps the body working well.

• By delivering essential materials to body cells and removing waste materials from the cells.

» THIS BODY SYSTEM IS ALSO KNOWN AS THE CARDIOVASCULAR SYSTEM.

How the Circulatory System works

• Blood carries substances through Circulatory System

• Organs serve as transfer stations– Blood picks up

nutrients and delivers them to cells

• Wastes and removes them from body

Parts of the Circulatory System

• Heart

• Blood Vessels

• Blood

HEART

• Is a pump, that moves blood in 2 major pathways

1. Pulmonary Circulation

2. Systematic Circulation

HEART

• The heart is divided into 4 chambers– Each upper chamber is

called ATRIUM– Each lower chamber is

called VENTRICLE

* VALVES open and close to control the flow of blood

Pulmonary Arteries

• Carry blood containing carbon dioxide from your heart to your lungs.

Pulmonary Veins

• Carry blood containing oxygen from your lungs to your heart.

Blood

• A mixture of solids in a large amount of liquid called plasma

• PLASMA– Is about 92% water

– The solids are• Red blood cells

• White blood cells

• Platelets

Parts of Blood

• Red blood cells – carry oxygen to the cells and carbon dioxide away from the cells.

• White blood cells – help fight disease and infection by attacking germs that enter the body

• Platelets – help blood clot, which seals cuts and prevents excess blood loss from a wound

More about Blood

• Blood is essential to life

• Your blood is not the same as everyone else’s

• Blood transfusions– Blood must match– Mixing blood could have serious side effects

• High fevers, difficulty breathing, and even death

Blood Types

A B

AB O

Positive or Negative Blood

• Rh +

– Blood does contain Rh factor

• Rh –

– Blood does not contain Rh factor

Blood Banks

• People of age can donate blood

• Only people in good health can donate

• A new needle is used every time blood is drawn

• All donated blood is tested for disease

Blood Vessels

• Over 80,000 miles of blood vessels move your blood throughout your body

• Three types of blood vessels

1. Arteries

2. Veins

3. Capillaries

Arteries

Carry blood away from the heart

Veins

Blood vessels that carry blood from the body back to the heart

Capillaries

Tiny tubes that carry blood from the arteries to the body’s cells and from

cells to the veins

Blood Pressure

• As blood moves through your body, it exerts pressure against the walls of blood vessels

• Sphygmomanometer – instrument that measures blood pressure

Cardiovascular Disorders

• Stroke• Heart attack• Arteriosclerosis• Hypertension

– High blood pressure

• Anemia• Sickle-cell anemia• Mononucleosis• Leukemia• Hemophilla

Cardiovascular Disorders

• Open to page 303

• Write the descriptions to each disorder in your notes