Control and Coordination

Control and coordination

• Working together of various integrated body systems in response to changes in the surrounding for the maintenance of bodily functions is known as control and coordination
• Nervous system and endocrine system provide control and coordination in animals.

Nervous system

• Neurons -functional units of the nervous system, conduct messages in the form of electrical and chemical impulses
  • Neuron composed of cell body and dendrite, axon and nerve endings.

• Types of neuron:-
  • Sensory neuron
  • Motor neuron
  • Relaying or intermediate neuron

• Nerve: A nerve is a collection of nerve fibres (or axons) enclosed in a tubular medullary sheath. This sheath acts as an insulation and prevents mixing of impulses in the adjacent fibres.​

• Transmission of nerve impulse:
  Under normal conditions, the outer side of the nerve fibre consists of positive charge as more Na+ ions are present outside axon membrane. The neuron is then said to be in polarised state. On stimulation, the membrane becomes more permeable and Na+ ions move insid…