Circulatory System

What is the main organ of the circulatory system?

• heart

• bone

• small intestine

• lungs

Arteries carry oxygen rich blood away from the heart.

• False

• True

Veins carry oxygen poor blood back to the heart.

• True

• False

The job of the heart is to . . .

• pump blood around the body.

• give energy to the body.

• break down food.

• send food to the small intestines.

(a)   are the smallest blood vessels.

• Capillaries

• Veins

• Arteries

The main function of the circulatory system is

• Excrete waste

• to transport messages from the body to the brain

• To give the body structure and support

• transport blood, nutrients, and gases throughout the body

The FREQUENCY of heart contractions is...

• voluntary muscle contraction

• heart rate

• blood pressure

• respiratory rate

What is the Circulatory System also known as?

• The heart

• Nervous System

• Cardiovascular System

• Aorta

Identify the part of the heart indicated in the diagram.

• Left ventricle

• Right ventricle

• Right atrium

• Left atrium

Identify the part of the heart shown in the diagram.

• Right atrium

• Right ventricle

• Left atrium

• Left ventricle