Myelinated axons are fast, non-myelinated are slow; dendrites take signals in, axons send them out; thalamus relays info, hypothalamus controls body needs; cerebrum thinks, cerebellum balances.

Differentiate between: (a) Myelinated and non-myelinated axons

Question:

Differentiate between:

(a) Myelinated and non-myelinated axons

(b) Dendrites and axons

(d) Cerebrum and Cerebellum

Answer:

(a) Myelinated and non-myelinated

Feature	Myelinated	Non-myelinated
Sheath	Schwann cell myelin	No myelin
Conduction	Fast (saltatory)	Slow (continuous)
Impulse jumping	Jumps between nodes of Ranvier	Travels continuously along axon

‍

(b) Dendrites and axons

Feature	Dendrites	Axons
Function	Receive signals	Send signals
Number	Many per neuron	Usually one
Structure	Short, branched	Long, single

‍

Feature	Thalamus	Hypothalamus
Function	Relay sensory info	Regulate hormones, temperature, hunger, thirst
Location	Forebrain	Below thalamus
Role	Sensory “switchboard”	Body’s “master regulator”

‍

(d) Cerebrum and Cerebellum

Feature	Cerebrum	Cerebellum
Function	Thinking, memory, voluntary actions	Balance, coordination, posture
Size	Largest brain part	Smaller, behind brainstem

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Chapter 18 NCERT Class 11 Biology SOLUTIONS

Question:

Answer:

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Chapter 18 NCERT Class 11 Biology SOLUTIONS

Question:

Answer:

More NCERT Questions

Distinguish between: (a) Afferent neurons and efferent neurons

Answer the following: (a) Which part of the human brain is the most developed?

Explain the role of Na⁺ in the generation of action potential

Give a brief account of Mechanism of synaptic transmission

Write short notes on the following: (a) Neural coordination (b) Forebrain (c) Midbrain (d) Hindbrain (e) Synapse

Draw labelled diagrams of the following: (a) Neuron (b) Brain

Briefly describe the structure of the brain?

Compare the following: (a) Central nervous system (CNS) and Peripheral nervous system (PNS) (b) Resting potential and Action potential

Briefly describe the structure of the brain?

How do nervous systems differ in simple and complex animals?

What are the differences between voluntary and involuntary actions in the nervous system?

What is a reflex action, and how does it work?

What is the difference between the CNS and PNS?

How do animals respond to stimuli through the nervous system?

What are the types of neurons in the nervous system?

How do neurons work in the nervous system?

What is the function of the nervous system in animals?

What are the main components of the nervous system?

What is the nervous system in animals?

Related Topics

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