Active/Action potential & Saltatory / Jumping Impulse

Coordination in animals
Nervous Coordination
Elements of Nervous system
1. Neurons
The chief structural and functional units of the Nervous system are Neurons.
Neuroglia
Types of Neurons.
1. The Sensory Neurons.
2. Associative Neurons.
3. Motor Neurons.
Structure of Neurons.
Dendron
cell body
2. Receptors
They detect changes in the environment of the animal
Classification of Receptors
a) Chemoreceptor
b) Mechanoreceptor
c) Photoreceptor
d) Thermoreceptor
e) Nociceptor
3. Effectors
These are the structure which respond when they are stimulated by impulse coming via motor neuron
Nerve Impulse
it is a wave of electrochemical changes , which travel along the length of the neuron involving chemical reactions and movements of ions across the cell membrane .
Electric potential
Membrane Potential
Resting Membrane Potential (RMP)
Factors Involved in Resting Membrane Potential
Distribution of Sodium and potassium across membrane
Sodium potassium pump
Negative organic ions
Leakage of K
Maintenance of ions
Initiation of nerve impulse
Active/Action potential
Factors involved in Active/Action Membrane potential
1. Sodium and potassium ion movement
2. charges are reversed
3. Passage of nerve impulse
4. Membrane potential
Coordination and Control
Chapter No.17
Biology
Part 2