Blood cell formation is called ________.

1. Blood cell formation is called ________.
2. ossification
3. hematopoiesis
4. homeostasis
5. metabolism
6. What bones protect the spinal cord?
7. ribs
8. sternum
9. vertebrae
10. coxal bones
11. Cube-shaped bones that contain mostly spongy bone are called ________ bones.
12. flat
13. long
14. short
15. irregular
16. Small canals that connect osteocytes in their lacunae to the central canal are known as

________.

1. canaliculi
2. perforating (Volkmann’s) canals
3. central (Haversian) canals
4. perforating (Sharpey’s) fibers
5. The process of bone formation is known as ________.
6. hematopoiesis
7. hemostasis
8. metabolism
9. ossification
10. Bone-destroying cells known as osteoclasts are activated by the hormone ________.
11. calcitonin
12. parathyroid hormone (PTH)
13. insulin
14. growth hormone
15. Striated involuntary muscle tissue is classified as ________ muscle.
16. skeletal
17. cardiac
18. smooth
19. either smooth or skeletal
20. The epimysium covering on the outside of the muscle can blend into cordlike ________ or

sheetlike ________.

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1. tendons; aponeuroses
2. ligaments; tendons
3. fascia; ligaments
4. aponeuroses; ligaments
5. The ________ is an organelle that wraps and surrounds the myofibril and stores calcium.
6. cross bridge
7. sarcomere
8. sarcolemma
9. sarcoplasmic reticulum
10. Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as ________.
11. elasticity
12. irritability
13. contractility
14. extensibility
15. One neuron and all the skeletal muscles it stimulates is known as a ________.
16. sarcoplasmic reticulum
17. motor unit
18. synaptic cleft
19. neuromuscular junction
20. The heads of the myosin myofilaments are called ________ when they link the thick and thin

filaments together during skeletal muscle contraction.

1. neuromuscular junctions
2. synapses
3. cross bridges
4. motor units
5. The gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction is called the ________.
6. synaptic cleft
7. motor unit
8. cross bridge
9. H zone
10. The nervous system is structurally subdivided into two systems: ________ nervous system and ________ nervous system.
11. central; peripheral
12. somatic; autonomic
13. parasympathetic; sympathetic
14. autonomic; sympathetic
15. ________ cells form the myelin sheaths around nerve fibers in the PNS.
16. Satellite
17. Ependymal
18. Schwann
19. Nerve
20. Support cells in the central nervous system are collectively called ________.
21. myelin sheaths
22. neuroglia
23. oligodendrocytes
24. microglia
25. The part of the neuron that typically conducts nerve impulses away from the cell body is the ________.
26. dendrite
27. cell body
28. synaptic cleft
29. axon
30. The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________.
31. synaptic clefts
32. axon terminals
33. nodes of Ranvier
34. myelin sheathsUnit 2 Examination 86 GED 102 The Human Body
35. Sensory receptors located in muscles and tendons are termed ________.
36. Meissner’s corpuscles
37. proprioceptors
38. lamellar corpuscles
39. association neurons
40. The membrane that covers the outer surface of the eye and lines the eyelids is the ________.
41. choroid
42. sclera
43. conjunctiva
44. retina
45. The ________ gland is located above the lateral end of each eye and releases tears.
46. tarsal
47. ceruminous
48. lacrimal
49. ciliary
50. The fibrous covering of the eye consists of the white outer layer, known as the ________, and a transparent portion known as the ________.
51. sclera; cornea
52. conjunctiva; sclera
53. iris; pupil
54. pupil; cornea
55. The innermost sensory layer of the eye that contains bipolar cells and ganglion cells is the ________.
56. choroid
57. retina
58. sclera
59. cornea
60. The region of the optic nerve lacking photoreceptor cells is known as the ________.
61. retina
62. optic disc (blind spot)
63. choroid
64. iris
65. The biconvex structure that focuses light on the retina is the ________.
66. cornea
67. pupil
68. lens
69. iris