Body systems and ecosystems

2. A large blood vessel that takes oxygen rich blood away from the heart.
3. A tiny blood vessel that allows oxygen and nutrients to be absorbed from the blood into cells.
4. The system of the body involved in breathing.
6. The part of the brain that controls our body temperature.
11. A biotic factor that can cause an organism to get sick or die.
14. A biotic factor where 2 organisms go against one another for the same food or place to live.
15. An abiotic factor that includes things like temperature, rainfall and sunlight.
16. The system of the body that produces hormones.
18. A response that occurs in our muscles when our body temperature is too cold and needs to warm up.
19. The system of the body that includes the brain, spinal cord and nerves.
21. An organ in the digestive system that churns and mixes the food.

1. An organism that hunts, kills and eats its prey.
3. The system of the body that contains the heart and blood vessels.
5. A response that occurs in our blood vessels when our body temperature is too cold and needs to warm up.
7. Non-living factors that affect the survival of an organism.
8. Living factors that affect the survival of an organism.
9. A response that occurs in our skin when our body temperature is too warm and needs to cool down.
10. The system of the body that protects against bacteria and viruses.
12. The system of the body that breaks down food and allows nutrients to be absorbed into the blood.
13. Two organs in the digestive system that absorb nutrients and water into the blood.
15. An abiotic factor that all living things require to survive.
17. A response that occurs in our blood vessels when our body temperature is too warm and needs to cool down.
20. A large blood vessel that takes blood that is low in oxygen towards the heart.
22. An organ in the circulatory system that pumps blood around the body.