Circulatory system

Question 1

What are the arteries?

Answer 1

flexible vessels with thick muscular walls that carry blood away from the heart

Question 2

What are the capillaries?

Answer 2

smallest blood vessel, only one cell layer thick. Substances diffuse them through to the body tissues. They connect the arteries to veins.

Question 3

What are veins?

Answer 3

made up of thin walls, one-way valves to prevent backflow. They carry blood to the heart.

Question 4

What is the heart?

Answer 4

muscular pump that pumps blood to the lungs to pick up oxygenated blood and then pump it to the rest of the body.

Question 5

What is plasma?

Answer 5

the liquid in the blood that blood cells contain. It moves the nutrients and waste throughout the body.

Question 6

What do red blood cells do?

Answer 6

they carry oxygen from the lungs to the rest of the body and return carbon dioxide waste to the lungs.

Question 7

What are white blood cells?

Answer 7

part of the body’s immune system they help the body fight infection and other diseases.

Question 8

What does the circulatory system do?

Answer 8

transport gases, nutrients and waste