The job of the heart is to _____________.

The heart is about the size and shape of your _____________.

The heart is made up of _________ chambers.

True or False: Blood traveling in your veins is blue.

The upper chambers of the heart are known as _____________,

The lower chambers of the heart are known as _____________

_____________ carry oxygen-rich blood away from the heart to all of the body's tissues.

A flap of tissue that prevents blood from flowing backward.

Blood vessels that carry blood back to the heart.

Tiny blood cells where substances are exchanged between blood and body cells.

Type of cell in blood that carries oxygen.

Type of cell in blood that defends the body against infection.

Cell fragment in blood that helps blood clot.

Fluid part of blood that contains many dissolved substances.

Blood flows from the right atrium into the _______________ _______________.

The right ventricle pumps blood into the _____________, where the blood releases waste gases and picks up oxygen.

Newly oxygen-rich blood returns to the heart and enters the ____________ ____________.

Blood flows through the left atrium into the ____________ ____________.

The ____________ ____________ pumps oxygen-rich blood to all parts of the body.