| A | B |
|---|
| circulatory system | body system that transports nutrients and wastes between various body tissues; includes heart, blood, and blood vessels |
| respiratory system | body system that brings oxygen into the body and removes carbon dioxide; includes the nose, trachea, and lungs |
| trachea | long structure made of soft tissue that connects the mouth and nose to the lungs (plural: tracheae) |
| lung | organ that absorbs oxygen gas from air that an organism inhales |
| alveoli | tiny, thin-walled structure across which oxygen gas is absorbed and carbon dioxide is released in the lungs (singluar: alveolus) |
| diaphragm | thin muscle below the rib cage that controls the flow of air into and out of the lungs |
| heart | muscle in the chest that moves blood throughout the body |
| artery | large blood vessel that carries blood away from the heart |
| vein | large blood vessel that carries blood from the rest of the body to the heart |
| capillary | tiny blood vessel that transports blood between larger blood vessels and other tissues in the body |
