Circulatory System

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

The job of the heart is to _____________.

• pump blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.

The heart is about the size and shape of your _____________.

• head

• fist

• hand

• foot

The human heart is an organ that pumps blood throughout the body supplying oxygen, nutrients, blood, and hormones to and from the tissues removing _________ ___________ and other wastes.

• hydrogen dioxide
• carbon moxoide
• water molecules
• carbon dioxide

The heart is made up of _________ chambers.

• one

• two

• three

• four

True or False: Blood traveling in your veins is blue.

• True

• False

The upper chambers of the heart are known as _____________,

• valves

• ventricles

• atria

• septum

The lower chambers of the heart are known as _____________

• valves

• ventricles

• atria

• septum

_____________ carry oxygen-rich blood away from the heart to all of the body's tissues.

• Arteries

• Capillaries

• Veins

• Alveoli

A flap of tissue that prevents blood from flowing backward.

• Atrium

• Ventricle

• Valve

• Epiglottis