v)The long tubular cavity of the spinal cord is called__________.
a)Endocrinegland b)Medullaoblongata
c)Synapse d)Centralcanal
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Medulla oblongata [option b]
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Answer:
(d)
Explanation:
central canal is correct.
synapse is connection of two nerve cell
medulla is 3rd part of brain
endocrine gland secrete hormones
so the last option is correct
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