Circulatory System

Chapter 3, Lesson 1- by Shay Traywick

What is the circulatory system?

• The circulatory system moves materials around the body

• Think of it like your body’s “transportation system”

• The circulatory system moves food and oxygen to the cells and takes away the cells’ waste

What are the parts ?

• Heart

• Blood

• Blood vessels

What is blood made up of?

• Blood contains: – Plasma– Platelets– Red blood cells– White blood cells

Plasma (in the blood!)

• The biggest part of your blood is a straw-colored liquid called Plasma:– Carries food from

digestive system to your cells

– Carries away cells’ waste

– Takes water to the cells

– Moves some chemicals from one part of the body to another

Red Blood Cells (also in blood!)

• The next largest parts of your blood are Red Blood Cells:– Red blood cells carry

oxygen to cells

White Blood Cells & Platelets (last 2 parts of the blood!)

• White blood cells work hard to protect your body from germs, etc.– When the body needs to

fight infection, it makes more white blood cells

• Platelets cause blood clots to form, minimizing loss of blood from cuts

3 Kinds of Blood Vessels(think of blood vessels as highways your blood uses to move through the body!)

• Arteries

• Capillary

• Veins– Valves

LOOK AT PICTURES ON pg. 66 & 67

Arteries (a kind of blood vessel)

• Arteries are blood vessels that carry

blood AWAY from your heart

Veins & Valves(still part of blood vessels)

• Veins are blood vessels that take blood from cells

BACK to the heart

• Valves are flaps that act like doors that keep blood flowing in 1 direction.

Capillaries(still part of blood vessels!)

• Capillaries are the smallest blood vessels, very thin walls

• Capillaries joint together to from your tiniest veins

The heart has parts???

• Your heart has 4 chambers

• The upper part of each side is the: atrium

• The lower part is called: ventricle

Tell me more about the HEART

• Right side- collects blood that has circulated through the body and pumps it to the lungs

• Left side- collects oxygen-rich blood from the lungs & pumps it to the arteries

Let’s Review what we learned…

• What is the circulatory system?

• What makes up the circulatory system?-3 things

• What makes up blood?-4 things

• What kind of blood vessels did we discuss?- 3 kinds

• Tell me how the heart is divided?

• What is the circulatory system like that we can compare it to???

Study Study Study!!

• Check out the great pictures in your text…

• Do you have any questions????