wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Differentiate between :

(a) Myelinated and non-myelinated axons

(b) Dendrites and axons

(c) Rods and cones

(d) Thalamus and Hypothalamus

(e) Cerebrum and Cerebellum

Open in App
Solution

(a) Myelinated and non-myelinated axonsMyelinated axonsNon myelinated axonsThese appear whitish in colour.Myelin sheath is absent due to which white colour is not seen.Nodes of Ranvier are present at intervals.Nodes of Ranvier are absent.Transmission of nerve impulse is faster.Transmission of nerve impulse is slower.Ion exchange can occur only at the nodes.Ion exchange occurs all over the surface.

(b) Dendrites and axonsDendritesAxonsThese are extension of cyton present at anterior position.These are extension of cyton present at posterior positionThese conduct impulses towards the cell body.These conduct impulses aways from the cell body.Dendrites are always non-myelinated.Axons can be myelinated or non-myelinatd.The terminal of dendrites become receptors.The terminals of axon ends in a group of brancehs called terminal arborisations.

(c) Rods and conesRodsConesRods are sensitive to dim light. Cones are sensitive to bright light only.They have visual purple pigment called rhodopsin.They have visual violet pigment called iodopsin.Colours are not visible with rod cells.Cones help to see colours

(d)Thalamus and HypothalamusIt represent the side of diencephalon.It represents the lower part of diencephalon.It is th emajor coordinating centre for sensory and motor signalling.It is the major centre for regulation of body temperature, thirst, hunger etc.It does not secrete any hormone.It secretes several hormones.

(e)Cerebrum and CerebellumIt is part of fore brain.It is part of hind brain.It consists of two cerebral hemispheres.It consists of two cerebellar hemispheres and a median vermis.It initiates voluntary movementsIt maintains posture and equilibrium.


flag
Suggest Corrections
thumbs-up
50
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon