1.
The system responsible for transporting oxygen, nutrients, and other substances throughout the body.
2.
The organ that pumps blood through the circulatory system.
3.
Blood vessels that carry oxygenated blood away from the heart.
4.
Blood vessels that carry deoxygenated blood back to the heart.
5.
Small blood vessels where the exchange of oxygen and carbon dioxide takes place.
6.
The system that helps in the exchange of gases between the body and the environment.
7.
The opening in the body through which air enters.
8.
The external part of the nasal cavity that also serves as an entrance for air.
9.
The passage that connects the throat to the lungs.
10.
The muscle that aids in breathing by moving to allow airflow in and out of the lungs.
11.
The male reproductive cell.
12.
The female reproductive cell.
13.
Another term for eggs produced in the female reproductive system.
14.
The temperature at which a substance changes from solid to liquid.
15.
A substance that transfers heat effectively.
16.
A substance that allows electricity to flow through it.
17.
A change where the substance can return to its original form.
18.
The temperature at which a substance changes from liquid to gas.
19.
The process by which oxygen is taken in and carbon dioxide is released from the body.
20.
The period of physical and emotional changes that occur in adolescents as they mature.
21.
The process where a sperm cell and an egg cell combine to form a new organism.
22.
The process of changing a solid into a liquid by heating.
23.
The process of changing a liquid into a gas by heating.
24.
Materials that allow heat or electricity to pass through them easily.
