Cardiovascular System

______________ are the smallest blood vessels.

• Arteries
• Veins
• Capillaries

How many chambers does the human heart have?

• 2
• 4
• 8
• 6

The two chambers on bottom are called _______.

• valves

• atria
• ventricles

• sinuses

The fluid part of you blood (that is made of a mixture of water, salts, nutrients and sugar ) that helps the blood flow smoothly is the__________?

• Red blood cells

• Plasma

• White blood cells

• Platelets

The heart is an involuntary muscle.

• True
• False

What is the function of red blood cells?

• Fight Pathogens

• Allow blood to flow smoothly

• Carry oxygen

• Form clots

What do veins do?

• Carry blood towards the heart

• Store food

• Nothing

Each chamber in the heart is separated by a valve. What is the purpose of a valve?

• To store excess blood

• To produce hormones
• To oxygenate the blood

• To keep the blood flowing in one direction

What is the largest blood vessel in the body?

• Aorta

• Artery

• Veins

• Capillary

What is Number 15?

• Right Ventricle

• Right Atrium

• Left Ventricle

• Left Atrium