Homeostasis (part 2) - Review

1. Homeostasis (part 2) - Review

3. Completion

4. Complete each sentence or statement.

6. 1. The ____________________ is made of the nerves in the brain and spinal chord and coordinates information from sensory neurons.

8. 2. The areas between the myelin sheath on the axon that allow ions to pass are called the _________________________.

10. 3. When a nerve cell is excited, sodium ions rush into the cell, changing its charge. This is referred to as ____________________.

12. 4. _________________________ is the intensity a stimulus must be to produce a response.

14. 5. Excessive noise can damage the ear. The muscles in the bones of the ____________________ act to protect the more delicate parts of the ear.

16. 6. Balance is maintained by the bending of ___________________ that initiate a nerve impulse.

18. 7. The blood brain barrier, composed of three membranes, determines which chemicals will reach the brain. It is known as the ____________________.

20. 8. The lens of a person's eye becomes thinner as the person watches a train leave. This is an example of _________________________.

22. Matching

24. Match each item with the correct statement below.

25. a. axon d. schwann cells

26. b. dendrites e. synapses

27. c. myelin sheath

30. ____ 9. special glial cells

32. ____ 10. receive information from sensory receptors or nerve cells

34. ____ 11. extension of the cytoplasm of a nerve cell

36. ____ 12. acts as an insulator for the neuron

38. ____ 13. small spaces between neurons

40. Short Answer

42. 14. During a physical examination, a doctor will usually hit a patient's knee on one side with a small hammer. Instantly the leg jerks upward. Explain what the doctor is testing?

44. 15. Why is a sharp blow to the lower back part of the skull extremely dangerous?

46. 16. Refer to the graph below:

48. Referring the above graph, complete the following table below.

49. Section of Graph Activity Description

50. a