Across
- 6. A blood vessel that carries blood away from the heart.
- 8. Chemicals secreted by lymphocytes, which attach to antigens and help to destroy them.
- 9. Like carbohydrates, they can be used in a cell to release energy.
- 11. It alters the rate of a chemical reaction, without it being changed itself.
- 13. It takes food down the stomach behind the trachea.
- 14. The process of getting rid of undigested cellulose in faeces.
Down
- 1. The diffusion of water molecules from a region of high water potential to a lower one through a partially permeable membrane.
- 2. A junction between two nerve cells consisting of a minute gap across.
- 3. It has lignified walls to support and transport water in plants.
- 4. This is the group that humans belong to.
- 5. They are the powerhouses of all cells except prokaryotes.
- 7. A person is said to have this when the control of blood glucose concentration does not work.
- 10. Another name for leaf stalk.
- 12. Type of respiration making our cells release energy from glucose by combining it with oxygen.