The Human Circulatory System

Front

The heart is made of what?

Back

Muscle

Front

The heart's job is to _______________.

Back

Pump Blood

Front

Where is blood made in order to replenish the body's blood supply?

Back

inside your bones from bone marrow

Front

When the heart contracts blood is pushed into tubes called what?

Back

Blood vessels

Front

How many types of Blood Vessels are there?

Back

3

Front

The heart has four holes inside it that fill up with blood when it relaxes.

Back

True

Front

When a muscle squeezes and tightens it is called a ____________.

Back

contraction

Front

The holes inside the heart each have names, but all together they are often referred to as _____________.

Back

Chambers

Front

A human adult body has about how much blood?

Back

5 liters

Front

What are the types of Blood Vessels?

Back

Veins, Arteries and Capillaries