Biology
Mention where in human body are the following located and state their main functions:
(a) Corpus callosum
(b) Central canal
Answer
(a) Corpus Callosum — Corpus callosum ("hard body") is a sheet of fibres connecting the two cerebral hemispheres. It is located in the forebrain. It connects two cerebral hemispheres and transfers information from one hemisphere to other.
(b) Central Canal — It is located in centre of the spinal cord. It is in continuation with the cavities of the brain. It is filled with cerebrospinal fluid and acts as shock proof cushion. In addition, it also helps in exchange of materials with neurons.
Related Questions
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
(a) Stimulus : Receptor :: Impulse : ……………
(b) Cerebrum : Diencephalon :: Cerebellum : ……………
(c) Receptor : Sensory nerve :: Motor nerve : ……………
(d) Axons : Nerve :: Cytons : ……………
(e) Cerebrum : Corpus callosum :: Cerebellum : …………… .
Given below are sets of four terms each. Choose the odd one and write the category of the remaining terms :
(a) Duramater, Gray matter, Piamater, Arachnoid
(b) Cerebrum, Cerebellum, Spinal cord, Medulla oblongata.
(c) Pons, Cyton, Axon, Dendrons
(d) Hypothalamus, Cerebellum, Pons, Medulla oblongata
(e) Sneezing, Blinking, Blushing, Knitting without looking
State whether the following statements are true (T) or false (F).
(a) The main component of the white matter of the brain is perikaryon.
(b) The arachnoid layer fits closely inside the pia mater.
(c) A double chain of ganglia, one on each side of the nerve cord belongs to the spinal cord.
(d) Dura mater is the outermost layer of the meninges.
State whether the following are simple reflexes, conditioned reflexes or neither of the two.
(i) Sneezing……………………
(ii) Blushing……………………
(iii) Contraction of eye pupil………………..
(iv) Lifting up a book……………………
(v) Knitting without looking…………………
(vi) Sudden application of brakes of the cycle on sighting an obstacle in front……………….