The myelin sheaths that surround the axons of some of the neurons in the CNS are formed by
A) astrocytes.
B) Schwann cells.
C) oligodendrocytes.
D) microglia.
E) ependymal cells.
C) oligodendrocytes.
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Compared to its partial pressure in the atmosphere, oxygen's partial pressure in the alveoli is
A. higher. B. lower. C. equivalent.
Vitamin B is important for the production of red blood cells because it is utilized
in the synthesis of __________ . Fill in the blank(s) with correct word
After acetylcholine is released from the axon terminal, it
A. diffuses out of the sarcoplasmic reticulum. B. binds to its receptors on the sarcolemma. C. binds to troponin to expose active sites on actin. D. binds to active sites on actin.
Which of the following nerves contain ANS neurons?
A) thoracic nerves B) cervical nerves C) coccygeal nerves D) all lumbar nerves