Circulatory System

What Do These Two Systems Have In Common? What Do These Two Systems Have In Common?

(Think-Pair-Share)(Think-Pair-Share)

Subway System Circulatory System

Job of the Circulatory System

Acts as a highway to carry oxygen and nutrients toward your cells while carrying wastes and carbon dioxide away from cells.

Your heart pumps 4300 gallons of blood per day!

THINK! - What parts make up your circulatory system? Heart Blood vessels (arteries, veins,

capillaries) Blood

The Heart Your heart is located behind the sternum and is the size of your fist.

THINK! – What muscle tissue makes up the heart? Cardiac

The heart has 4 chambers:

The two upper chambers are the atria.

Two lower chambers are the ventricles.

The septum is a thick muscle that separates the right and left sides of the heart so oxygen poor and oxygen rich blood do not mix.

Valves are flaps of tissue that prevent the blood from flowing backwards

Your Heart as 2 Pumps - http://www.kscience.co.uk/animations/heart.swf

Parts of the Heart

Left Atrium

Left VentricleRight Atrium

Right VentricleSeptum

Aorta(carries blood to body)

Pulmonary Artery(carries blood fromthe heart to the lungs)Vena Cava

(brings blood from bodyback to the heart)

Valves

Pulmonary Veins

Blood Vessels of the Body

Arteries carry blood “away” from the heart

Veins carry blood “back” to the heart

Capillaries the tiniest vessels where oxygen

and nutrients can diffuse from bloodstream into cells

Only 1 cell thick You can see them nourishing the

white part of your eye

The Heart and Circulation

The job of the heart is to circulate blood throughout the body

The Heart is really 2 pumps working side by side: The right side pumps blood to the lungs to pick up

oxygen.

The left side pumps oxygenated blood to all tissues of the body.

Check out this simple clip first http://www.kscience.co.uk/animations/

blood_system.swf

Activity: Trace the Pathway of Blood During a Heart Beat

1. Oxygen poor blood enters the heart through the vena cava.

2. Blood is then pumped into the right atrium and then right ventricle.

3. Oxygen poor blood is pumped, exits the pulmonary artery and goes to the lungs.

4. Once it has oxygen, blood reenters the heart.

5. Blood is pumped into the left atrium and then left ventricle.

6. Oxygen rich blood is pumped out of the aorta to the body tissues.

Label and Color Code the Pathway of Blood

THINK! – What sound does the heart make?

LUB DUB LUB DUB As blood is pumped from atria to ventricles the “lub” sound is made

As blood is pumped from ventricles to body, the “dub” sound is made.

Heart Disease Atherosclerosis

Build up of fat and cholesterol in arteries

Leads to heart attack Heart Disease: United Streaming

Hypertension High blood pressure Clogged arteries can cause high

blood pressure Normal pressure is 120/80 THINK! – What do these

numbers mean? First number – measures

pressure when ventricles contract

Second number – measures pressure when ventricles relax