Circulatory System

The main function of the circulatory system is 

• To give the body structure and support
• Excrete waste
• transport blood, nutrients, and gases throughout the body
• to transport messages from the body to the brain

Platelets 

• allow for gases to exchange
• give blood its color
• fight infection and disease
• help clot blood

White blood cells

• allow for gases to exchange
• give blood its color
• fight infection and disease
• help clot blood

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

Oxygen deprived blood enters the heart through the 

• right ventricle 
• left ventricle
• right atrium
• left atrium

On and off switches to let blood in and out of the heart are known as

• ventricles
• valves
• buttons
• pulses

Arteries carry nutrient and oxygen rich blood _____________ from the heart.

• back to
• away
• parallel

Veins carry blood _________  the heart.

• back to 
• away
• parallel

Blood vessels are 

• veins
• capillaries
• arteries
• all of them