Human Nervous Systems and Sense Organs

Question 1

What are Nervous Tissues

Answer 1

Nerves are composed of nerve fibres held together by connective tissue.
The nerve fibres in turn are made up of specialised nerve cells called neurons

Question 2

What are Sensory Neurons

Answer 2

Sensory Neurons are neurons which carry impulses from the receptors (nerve endings or sense organs) to the Central Nervous System (Brain and Spinal Cord)

Question 3

What are Motor Neurons

Answer 3

Motor Neurons are neurons which carry impulses from the Central Nervous System to the effectors (Muscles or Glands)

Question 4

What are Connector Neurons

Answer 4

Connector Neurons/ Interneurons are neurons which carry impulses inside the Central Nervous System from a Sensory Neuron to a Motor Neuron

Question 5

What is the Cell Body

Answer 5

The Cell Body has one or more branching cytoplasmic threads called Dendrites which carry impulses towards the cell body:
A Prominent Nucleus
Cytoplasm with Nissl Granules which produce substances for the transmission of nerve impulses
Mitochondria, Ribosomes and Endoplasmic Reticulum

Question 6

What is the Axon

Answer 6

The Axon conducts impulses away from the Cell Body
It has branched endings called terminal branches
It is usually covered by two membranes viz. a Myelin Sheath and Neurilemma