Answer the following questions true (T) or false (F)
1. The predominant ingredient of the inorganic matrix of bone is calcium salts, with the majority existing as large molecules of hydroxyapatite crystals.
2. Spongy bone resists forces from many directions and forms a protective framework for the red bone marrow.
3. The process of ossification begins at a primary ossification center in both intramembranous and endochondral ossification.
1. TRUE
2. TRUE
3. TRUE
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Skeletal muscle fibers are formed from embryonic cells called
A) sarcomeres. B) myofibrils. C) myoblasts. D) fascicles. E) myomeres.
The bundle of nerve roots that occupy the vertebral canal from L2 to S5 is called the __________.
A. medullary cone B. cauda equina C. lumbar enlargement D. cervical enlargement E. spinal cord
The larynx ________
A) contains the apparatus for speech B) is covered during swallowing by the cricoid cartilage C) is formed by a group of elastic cartilages D) is located posterior to the esophagus (food chute)
Which statement is the most likely if drug X has a stimulatory effect at a synapse?
A) Drug X opens chloride channels on the postsynaptic membrane. B) Drug X opens potassium channels on the postsynaptic membrane C) Drug X opens sodium channels on the postsynaptic membrane. D) Drug X causes hyperpoloarization of the postsynaptic membrane.