Biology

2. One of the larger air tubes in the lungs. Each lung has a main bronchus that branches into smaller and smaller airways.
3. The transparent dome at the front of the eyeball that is the eye's main focusing lens.
4. A thin-walled blood vessel that returns blood at low pressure from body organs and tissues to the heart.
6. The sum of all the physical and chemical processes that take place in the body.
8. The dome-shaped muscular sheet that separates the chest from the abdomen.
11. A watery fluid secreted into the mouth by the salivary glands to aid chewing, tasting and digestion.
12. Fatty or oily substance, insoluble in water, with varied roles in the body.
13. The outer layer of the skin; its box-shaped cells become flatter and scalier towards the surface.
14. Control centre of a cell, containing the genetic material DNA.
17. Watery or jelly-like fluid that fills the bulk of a cell; it contains many organelles.
18. Body structure made of similar cells that perform one main function
19. A region of the brain located behind the brainstem. It is concerned with balance, posture, and the control of fine movement.

1. An elastic, muscular-walled tube that transports blood away from the heart to other body parts.
2. A type of microorganism with one cell. Only a few of the many species of them cause disease.
5. The coiled structure in the inner ear that converts sound vibrations into nerve impulses for the transmission to the brain.
7. A morphine-like substance produced naturally by the body in times of pain and stress, and also activated during exercise.
9. A soluble protein that attaches to body incaders, such as bacteria, and helps to destroy them.
10. The membrane separating the outer eat from the middle ear that vibrates in response to sound.
15. A threadlike structure, present in all nucleated body cells, that carries the genetic code for the formation of the body. A normal body has 23 pairs of it.
16. A protein that accelerates chemical reactions within cells.