By Po-Han Chen. The Nervous System. What good does it make?.
Creatures on the world can feel the surrounding in order to adapt the environment for survival. Animals relies on Endocrine system and Nervous system to adjust itself. Nervous system controls muscle contraction and coordinate the organs within a short time in order to protect itself.
3% of overall mass, but it is the most complicated system in body
Your Nervous system is mainly made up of
The nervous system is made up of Neurones.
Each neurone consists of a cell body and extending nerve fibre
INPUT Fromsensory organs to the brain and spinal cord.
I.e., from Nose, eyes to brain
OUTPUTFrom the brain and spinal cord To the muscles and glands.
Interneurons carry information between other neurons only found in the brain and spinal cord.
The cell body
Dose Protein manufacturing
No role in neural signaling
Contains the Cell’s Nucleus
Receive inputs from neighboring neurons
If enough inputs the cell’s AXON may generate an output
One axon per cell, 2 distinct parts
The tube branches at the end and attaches to other cells.
Brain is the organ that controls everything in your body, including your thought and reaction.
The nervous system is divided into two sections:
Central Nervous System
Outer Nervous System
The Central Nervous System is made up of Brain and Spinal cord
Electrical Signals are carried from the Brain to the receptors through Spinal cord
The Outer Nervous System is made of the nerves and the sense organs
Sense Organs includes
Skin - Touch
Nose - Smell
Tongue - Taste
Electrical signals are carried through nerve impulse which is widely spread in the body
An action potential is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a stereotyped trajectory
Outer surface-> Positively charged
Inner surface -> Negatively charged
When Stimulated, sodium channel opens and then ions diffuses in. This increases the positive charge inside the cell. Charge is now Reversed. With a potential difference of +40mV, This is Action Potential and membrane is depolarised.
Sensory – INPUT Fromsensory organs to the brain and spinal cord.
Relay – Interneurons carry information between other neurons only found in the brain and spinal cord.
Motor – OUTPUTFrom the brain and spinal cord To the muscles and glands.
Bigger axon diameters
Increase in temperature