How do living things respond?

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Across
  1. 1. Organ that excretes waste products and excess fluid as urine.
  2. 5. Junction between two nerve cells, consisting of a minute gap across which nerve impulses pass, via a chemical called a neurotransmitter.
  3. 7. Cells in a sense organ that detect changes in the environment.
  4. 10. Organ that is a gland in the digestive and endocrine system of vertebrates. As an endocrine gland, it produces several important hormones, including insulin and glucagon.
  5. 11. Large butterfly-shaped endocrine gland on the front of the neck producing various hormones.
  6. 16. Organ of the body that responds to external stimuli by sending nerve impulses to the sensory nervous system.
  7. 19. Organ involved in the production and removal of blood cells in most vertebrates and forming part of the immune system.
  8. 21. Body system made up of a series of glands that secrete chemicals called hormones into the blood in response to changes in the body.
  9. 24. Organ that responds to a stimulus.
  10. 25. Nervous pathway involving a small number of neurones. A reflex occurs when nervous impulses travel from the receptor to the spinal cord then to the effector organ.
  11. 26. Pea-sized endocrine gland at the base of the brain whose hormonal secretions control the other endocrine glands.
  12. 30. Main nerve cord carrying nervous impulses to and from the brain. It is protected by the vertebrae of the backbone.
  13. 31. System that works to eliminate waste from the body.
  14. 32. Body system that includes the heart, blood vessels, blood, lymph and the lymphatic vessels and glands. It works as a transport and delivery system and is responsible for the delivery of oxygen and nutrients to all cells, as well as the removal of carbon dioxide and waste products.
  15. 34. Nerve cell in the sense organs that detects change in the environment and sends a message to the central nervous system.
  16. 35. Part of the nervous system made up of the brain and spinal cord; necessary for thought processes.
  17. 36. Location of objects by reflected sound. A process seen in organisms such as dolphins and bats.
  18. 37. Chemical that controls the activities of organs. Hormones can be described as chemical messengers.
  19. 39. Type of organ that makes a substance for release (e.g. hormones). Substances are often released into the bloodstream or they may be released into cavities inside the body or its outer surface.
  20. 40. Nerve cell.
  21. 41. Control centre of the body and part of the central nervous system.
  22. 42. Group of similar cells working together on a particular job
  23. 43. The reaction of a living organism to a specific stimulus.
Down
  1. 2. A disease where the body cannot maintain healthy levels of glucose (sugar) in the blood.
  2. 3. A number of small swellings in the lymphatic system where the fluid lymph is filtered and the white blood cells (lymphocytes) are formed
  3. 4. A hormone that is released by the pancreas to raise the concentration of glucose (sugar) in the bloodstream.
  4. 6. Various tissues joined together make up an organ. Each organ has a specific job within the body.
  5. 8. Organs that produce hormones. Endocrine glands release hormones into the bloodstream for transport to target organs.
  6. 9. A living thing. Includes plants, animals, fungi and microscopic life forms.
  7. 12. Two small glands, one located near the upper part of each kidney, that function in the endocrine system. The glands secrete the hormone adrenaline as well as other important hormones.
  8. 13. Body system that breaks down and absorbs food.
  9. 14. The smallest unit of living things.
  10. 15. Nerve cell that causes a muscle or gland to respond to a stimulus.
  11. 17. Bundle of neurons.
  12. 18. An organism’s reaction to threat, in which certain hormones are produced, priming them for fighting or fleeing
  13. 20. Small endocrine gland in the brain. It produces a hormone (melatonin) that affects such things as wake/sleep patterns.
  14. 22. Group of organs responsible for carrying oxygen from the air to the bloodstream and for expelling carbon dioxide.
  15. 23. Change in the environment that can be detected and responded to.
  16. 27. Part of the nervous system. An elaborate network of nerves throughout the body that receives information from inside and outside the body and relays it to the central nervous system.
  17. 28. Group of organs working together to keep an organism alive and healthy.
  18. 29. gland Small endocrine glands in the neck that produce parathyroid hormone.
  19. 33. Sensory receptor that senses pain.
  20. 38. Female reproductive organ in which ova or eggs are produced and where hormones are secreted (e.g. oestrogen and progesterone).