Control and Co-ordination in Animals: Nervous system and endocrine system.In animals, the nervous system and hormonal system are responsible for control and co¬ordination.Receptors: Receptors are the specialized tips of the nerve fibres that collect the information to be conducted by the nerves.Receptors are in the sense organs of the animals.These are classified as follows :Phono-receptors: These are present in inner ear.Functions: The main functions are hearing and balance of the body.Photo-receptors: These are present in the eye.Function: These are responsible for visual stimulus.Thermo-receptors: These are present in skin.Functions: These receptors are responsible for pain, touch and heat stimuli.These receptors are also known as thermoreceptors.Olfactory-receptors: These are present in nose.Functions: These receptors receive smell.Gustatory-receptors: These are present in the tongue.Functions: These helps in taste detection....Nervous System: The nervous system is composed of specialized tissues, called nervous tissue. The nerve cell or neuron is the functional unit of the nervous system. It is the nervous system which is mainly responsible for control and coordination in complex animals.