Circulatory System

Which is responsible for providing oxygen to cells?

• respiratory system
• circulatory system
• muscular system
• nervous system

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These cells, in the blood, carry oxygen and give the blood its color.

• white blood cells
• plasma
• platelets
• red blood cells

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This type of vessel carries blood TO the heart:

• vein
• nerve
• muscle
• artery

When oxygen-rich blood is carried AWAY from the heart, it travels through an...

• artery
• neuron
• vein
• straw

The smallest type of blood vessel is the:

• nerve
• vein
• capillary
• artery

Veins have special ________________ to stop blood from flowing backward.

• gravity
• valves
• arteries
• ventricles

The cells in the blood that help fight germs and illnesses are the...

• red blood cells
• platelets
• white blood cells
• axons

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The circulatory system works with the ___________ system to provide our body with oxygen.

• respiratory
• digestive
• muscular
• skeletal

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The circulatory system works with the __________ system to obtain energy from nutrients that we eat. 

• respiratory 
• digestive
• skeletal
• nervous

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What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

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