SUMMARY
Stuent have been introduced to coordination in animals; nervous coordination in animal, for example nervous systems, neuron, reflex arc, sensory organ, etc. The coordination of body activities inside the body of an organism is brought about by two systems- the nervous systems. The nervous system is composed of the central nervous system (brain and spinal cord) and the peripheral nervous system (cranial and spinal nerves and the autonomic nervous system). The autonomic nervous system consists of a pair of chain of ganglia by the side of spinal cord. It is largely concerned with the normal functioning of the visceral organs. Cerebrum is the largest part of the brain and is the seat of intelligence. Cerebellum is the centre of balance. Medulla oblongata controls breathing and heart beat. Spinal cord is the centre for simple reflexes. The sensitive layer of the eye is the retina which is composed of rods (sensitive to dim light) and cones (sensitive to bright light and for colour vision). The internal ear performs two tasks perception of sound by the cochlea and that of disturbance in body balance by the semicircular canals, utriculus and sacculus. The nose perceives chemical stimuli by the chemicals carried by the air and the tongue by direct contact with them. Skin possesses receptors for touch, pain, heat, cold, etc.
- Lecturer : Nnamdi Chukwu Amadi