Bellwork

1. Where does blood become oxygenated?

2. Which side of the heart contains the oxygenated blood?

TOD Answers 9.1• The right side of the heart pumps blood to the

lungs. Here it absorbs oxygen and is now called oxygenated blood.

• The gas carbon dioxide is removed from the blood into the lungs. The blood returns to the left side of the heart and from here it is pumped to the body tissues where it gives up it’s oxygen and it’s now called deoxygenated blood. It passes back to the right side of the heart through veins.

1. What does double circulation mean.2. Explain the following statements….

a. Blood on the right side of the heart is at _____ pressure.

b. Blood on the left side of the heart is at ____ pressure.

c. Oxygenated blood from the lungs is at ____ pressure.

d. Veins contain ____ _____ valves.

And the answer is…

1. Blood passes through the heart twice during one circuit around the body.

2. •a. low•b. high•c. low•d. semi-lunar

The Main Players in Circulation

• The heart is the pump which circulates the blood through the body.

• Lungs oxygenate blood and remove carbon dioxide from the blood.

• Arteries carry blood away from the heart• Veins carry blood to the heart• Capillaries connect arteries and veins and

deliver oxygen to cells.

Basic Heart Design 4 chambers and many vessels

Right Side (Blue)

Left Side (Red)

The Septum stops the deoxygenated blood from the right side from mixing with the oxygenated blood from the left side.

Septum is a thick wall of tissue that separates the two halves.

I here the beat of your heart…

• The atria contract at the same time left and right atrium dump the blood into the ventricles.

• The ventricles contract at the same time, each pushing the blood out of the heart.

• Right to the _____• Left to the ______ _______

Double Circulatory System

Right Side

Left Side

Deoxygenated blood is carried to the lungs

Deoxygenated blood is returned to the right side of the heart

Oxygen diffuses from the blood to the cells of the body

Lungs Oxygen diffuses into the blood

Oxygenated blood flows back into the heart.

Left side pumps blood out with lots of pressure to move blood to all parts of the body.

1.Pulmonary Vein

2.Aorta

3.Pulmonary artery

4.Vena Cava

5.Right Atrium

6.Right Ventricle

7.Left Atrium

8.Left Ventricle

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2.3.

4.

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7.5.

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