Question

9. Differentiate between:
(a) Myelinated and non-myelinated azons
(b) Dendrites and axons
(c) Rods and cones
(d) Thalamus and Hypothalamus
(e) Cerebrum and Cerebellum​

Answer 1

Answer:

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a) The main difference between these two of neurons is the speed of conduction of impulse... Majority of the neurons in the central and peripheral nervous system are myelinated since they require fast conduction speeds. A neuron with unmyelinated axon has a comparatively lower speed of conduction of the nerve signals

b) Dendrites receive electrochemical impulse from other neurons and carry them inwards and towards cell body., while axon carry the impulse aways from the cell body. Dendrites are short and heavily branched in appearance, while axon are much longer

c) Rods are responsible for vision at low light levels. They do not mediate color vision and have a low spatial acuity. Cones are active at higher level are capable of color vision and are responsible of high spatial acuity.

d) The thalamus regulates sleep, Alertness and wakefulness, whereas the hypothalamus regulates body temperature, hunger fatigue and metabolism.

e) their size is the main difference. cerebrum is the largest part of the brain nd cerebellum makes the remaining part

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Answer 2

Answer:

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