The Circulatory System

The Circulatory System

Organs of the Circulatory System

The Circulatory System carries blood and dissolved substances to and from different places in the body.

Organs of the Circulatory System

Heart

Blood Vessels (Arteries, Veins, Capillaries)

https://kidshealth.org/en/teens/heart.html

Multiple Choice

How many chambers does your heart have?

• 1

• 2

• 3

• 4

Blood travels throughout the body using a network of blood vessels. There are 3 specific types of blood vessels: arteries, veins, and capillaries.

Arteries

Blood vessels that carry oxygenated blood from the heart to other parts of the body.

The largest artery in the human body is the aorta.

Arteries contain elastic fibers that allow it to stretch under increased pressure.

Arteries contain muscles that contract to push blood along.

Open Ended

Why do you think arteries need to be able to stretch under pressure?

Multiple Choice

Which chamber of the heart is connected to the aorta?

• Right atrium

• Left artium

• Right ventricle

• Left ventricle

Veins

Veins carry oxygen-depleted blood to the heart for rejuvenation.

Veins have valves that force blood to travel in only 1 direction.

Veins run parallel to arteries in the body.

When muscles contract to move the body, they also help the blood flow through veins (as they surround the vein).

https://www.britannica.com/science/blood-vessel

Multiple Choice

What blood vessels connects the blood flowing from the heart to the blood flowing to the heart?

• Artery

• Vein

• Capillary

Capillaries

Capillaries are the smallest and most numerous of the blood vessels.

Oxygen, nutrients, and waste are transferred through the capillaries into/from the tissues. This exchange can ONLY occur through a capillary.