1. Blood cell formation is called ________.
2. What bones protect the spinal cord?
d. coxal bones
3. Cube-shaped bones that contain mostly spongy bone are called ________ bones.
4. Small canals that connect osteocytes in their lacunae to the central canal are known as
b. perforating (Volkmann’s) canals
c. central (Haversian) canals
d. perforating (Sharpey’s) fibers
5. The process of bone formation is known as ________.
6. Bone-destroying cells known as osteoclasts are activated by the hormone ________.
b. parathyroid hormone (PTH)
d. growth hormone
7. Striated involuntary muscle tissue is classified as ________ muscle.
d. either smooth or skeletal
8. The epimysium covering on the outside of the muscle can blend into cordlike ________ or
a. tendons; aponeuroses
b. ligaments; tendons
c. fascia; ligaments
d. aponeuroses; ligaments
9. The ________ is an organelle that wraps and surrounds the myofibril and stores calcium.
a. cross bridge
d. sarcoplasmic reticulum
10. Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as ________.
11. One neuron and all the skeletal muscles it stimulates is known as a ________.
a. sarcoplasmic reticulum
b. motor unit
c. synaptic cleft
d. neuromuscular junction
12. The heads of the myosin myofilaments are called ________ when they link the thick and thin
filaments together during skeletal muscle contraction.
a. neuromuscular junctions
c. cross bridges
d. motor units
13. The gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction is called the ________.
a. synaptic cleft
b. motor unit
c. cross bridge
d. H zone
14. The nervous system is structurally subdivided into two systems: ________ nervous system and ________ nervous system.
a. central; peripheral
b. somatic; autonomic
c. parasympathetic; sympathetic
d. autonomic; sympathetic
15. ________ cells form the myelin sheaths around nerve fibers in the PNS.
16. Support cells in the central nervous system are collectively called ________.
a. myelin sheaths
17. The part of the neuron that typically conducts nerve impulses away from the cell body is the ________.
b. cell body
c. synaptic cleft
18. The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________.
a. synaptic clefts
b. axon terminals
c. nodes of Ranvier
d. myelin sheathsUnit 2 Examination 86 GED 102 The Human Body
19. Sensory receptors located in muscles and tendons are termed ________.
a. Meissner’s corpuscles
c. lamellar corpuscles
d. association neurons
20. The membrane that covers the outer surface of the eye and lines the eyelids is the ________.
21. The ________ gland is located above the lateral end of each eye and releases tears.
22. The fibrous covering of the eye consists of the white outer layer, known as the ________, and a transparent portion known as the ________.
a. sclera; cornea
b. conjunctiva; sclera
c. iris; pupil
d. pupil; cornea
23. The innermost sensory layer of the eye that contains bipolar cells and ganglion cells is the ________.
24. The region of the optic nerve lacking photoreceptor cells is known as the ________.
b. optic disc (blind spot)
25. The biconvex structure that focuses light on the retina is the ________.