Circulatory and Respiratory System

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

• veins

• arteries

• capillaries

The cells that contain hemoglobin which helps carry oxygen are called

• white blood cells

• red blood cells

• platelets

Red blood cells are produced in the

• liver

• bone marrow

• heart

The circulatory system consists of the heart and

• blood vessels

• lungs

• brain

Platelets help the body to

• fight infection

• carry waste

• make blood clot

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

• veins

• arteries

• capillaries

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

• arteries

• veins

• capillaries

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?

• veins

• capillaries

• arteries

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

• plasma

• platelets

• white blood cells

The white blood cells help the body

• transport oxygen

• transport waste

• fights disease