Circulatory and Respiratory Systems

The blood vessels that carry oxygen-poor blood back to the heart are the 

• arteries
• veins
• capillaries
• ventricles

The cells that contain hemoglobin which helps carry oxygen are called

• red blood cells
• white blood cells
• platelets
• plasma

Red blood cells are produced in the

• heart
• liver
• spleen
• bone marrow

The circulatory system consists of the heart and 

• lungs
• brain
• blood vessels
• intestines

Platelets help the body to

• make blood clot
• fight infection
• carry oxygen
• carry waste

The blood vessels that carry blood away from the heart are called

• arteries
• capillaries
• veins
• platelets

The small blood vessels in the middle of the picture that connects the arteries and veins are called

• arteries
• capillaries
• veins
• artriums

Nutrients and oxygen are able to leave through the thin walls of these small blood vessels through the process of diffusion. What are the blood vessels called?

• capillaries
• veins
• arteries
• ventricles

The part of the blood responsible for transporting waste and making blood flow is the 

• platelets
• white blood cells
• red blood cells
• plasma

The white blood cells help the body

• transport oxygen
• transport hormones
• cool down
• fight disease