Lower Science Bio BK9

2. daily food intake that contains all the different types of nutrient, and the right amount of energy
3. gradual increase of a substance in an organism; it happens when the substance cannot be broken down inside the body cells
5. a muscle that is attached to the shoulder blade and the radius bone; when it contracts, it makes the arm bend at the elbow
6. one of the small tubes leading into the lungs from a bronchus
8. air sacs in the lungs
12. of light, cannot pass through an object or be reflected from it.
13. something that can be broken down naturally by bacteria and fungi
16. a pair of muscles that work as a team; the contraction of one of the muscles causes bones at a joint to move in one direction, and the contraction of the other muscle causes movement in the opposite direction
18. useful materials made from natural renewable sources and not from oil
19. increase of the concentration of a substance as you go up a food chain

1. a type of joint where one bone has a ball-shaped end that fits into a socket on the other bone; it allows a circular movement
4. chemical reactions inside cells, where oxygen is used to break down glucose and release energy.
7. the liquid part of blood
8. one of the tiny air-filled spaces inside lungs; also called an alveolus
9. features of organisms that help them to live and reproduce in their habitat
10. using muscles to make movements that cause air to move in and out of the lungs
11. one of the two tubes that branch from the trachea, and which carry air into the lungs
14. a comparison that helps to explain something
15. chemicals produced by white blood cells, which kill pathogens
17. not having enough haemoglobin in the blood, so not enough oxygen is delivered to respiring cells