Which of the following is/are true about axon and dendrite?
a) axons are thick fibers than dendrites
b) axons are covered by Schwann cells and dendrites are non myelinated
c) axons have more cytoplasm than dendrites
d) all of these
Explanation dendrites receive impulses while axons transmit them
Chemically myelin sheath is made up of
a) lipids
b) carbohydrates
c) proteins
d) both b and c
Explanation The primary lipid of myelin is a glycolipid called galactocerebroside. The intertwining hydrocarbon chains of sphingomyelin strengthen the myelin sheath. Cholesterol is an essential lipid component of myelin, without which myelin fails to form.
Surface
area of neuron is increased by…
a) dendrites
b) axon
c) soma
d) schwann’s cell
Which of the following is/are called myelinated fiber?
a) axon
b) dendrite
c) soma
d) both a and b
Explanation a non myelinated part of axon between two Schwann cells is called node of Ranvier
All of the following are the constituents of soma except……….
a) nucleus
b) mitochondria
c) RER
d) nucleolus
Velocity of the impulse in axon fiber depends upon …….
a) length
b) diameter
c) myelin sheath
d) all of these
Explanation: the larger and thicker and myelinated axon transmits information faster
