Control and Coordination

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05 Human Nervous System

CONTROL AND COORDINATION IN HUMANS

 

There are two systems of coordination of activities in humans. These are:

  • Nervous system, and
  • Endorcine system (or Hormonal system)

 

 

Human nervous system:

The nervous system helps all other system of our body to work together.

 

 

The unit of nervous system: neuron

Nervous system is made of special cells called neurons. Neuron is the largest cell in the body (which looks like an electric wire).There are three types of neurons:

 

  • Sensory Neurons: They transmit impulses from the sensory cells or receptor towards the central nervous system which constitutes spinal cord and brain.
  • Motor neurons: They transmit impulses from the central nervous system i.e. spinal cord and brain towards the muscle cells or effectors.
  • Relay neurons: They occur in the central nervous system (brain and spinal cord) where they serve as links between other neurons.

 

 

A neuron (or nerve cell) has three components:

  • Cell body,
  • Dendrites, and
  • Axon,

 

Synaps: It is a microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next. Synapses ensure that nerve impulses travel in only one direction.

 

The organs of human nervous system

The main organs of the nervous system are:

  • Brain,
  • Spinal cord and
  • Nerve

 

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