Respiratory and Circulatory System

The ________is a dome-shaped muscle that helps you to breathe.

• vein

• diaphragm

• lungs

• capillary

An ______is a blood vessel that carries blood away from the heart to capillaries.

• lungs

• vein

• artery

• heart

Organs that work together to take air into the body and push it back out make up the _____________________.

• vein

• heart

• circulatory system

• respiratory system

A ______carries blood with little oxygen back to the heart.

• heart

• vein

• lungs

• artery

A _______is a tiny blood vessel that connects arteries and veins.

• capillary

• diaphragm

• heart

• lungs

The ________________transports oxygen, nutrients, water, and wastes.

• digestive system

• respiratory system

• circulatory system

• muscular system

The ______is a muscular pump that pushes the blood through the blood vessels.

• artery

• heart

• lungs

• vein

In the chest, the trachea divides into two tubes that enter the _____, the main organs of the respiratory system.

• capillary

• lungs

• heart

• vein

The two upper chambers of the heart, called the left and right ______receive blood from the veins.

• atrium

• heart

• lungs

• vein

True or False. The air you breathe in moves into the diaphragm and enters the lungs.

• True

• False