Properties of receptors, Biology

Properties of Receptors

The receptors collect information concerning the change in the environment such as temperature, illumination etc. In lower animals, sensory perception is mediated by undifferentiated nerve endings. These are their sense organs. Though, the receptors or sense organs become more specialized and elaborate. Such type of elaborate sense organs are present even in Cnidaria, and they become much more complicated in higher animals. You have already seen that sensory receptors exchange one form of energy into another, electrical. So all receptors are transducers. Even one molecule of odour substance is frequently able of evoking a small electrical disturbance in a chemoreceptor. This local current is generally the result of amplification too, and is propagated along the axon of the sensory receptor. So the receptor is extremely sensitive to change in the environment. You have to also note that each sensory receptor responds to just only one kind of stimulus. For example, chemo-receptors will respond to only chemical stimuli, but not to mechanical or light stimuli. Another significant fact you have to bear in mind is that the frequency of nerve impulse increases with strength of the stimulus. In other words, information that is concerning intensity of the stimulus is transmitted by frequency code. Thus the code of information travels as impulse in axons of all receptors, be it mechanoreceptor, photoreceptor or chemoreceptor. But because each kind of receptor is sensitive to one type of stimulus only and because these axons carry impulses to specific regions of the central nervous system, brain correctly interprets the information reaching it. Depending on the type of stimulus, receptors may be divided into mechanoreceptors, chemo receptors and photoreceptors.

Posted Date: 2/4/2013 6:58:40 AM | Location : United States







Related Discussions:- Properties of receptors, Assignment Help, Ask Question on Properties of receptors, Get Answer, Expert's Help, Properties of receptors Discussions

Write discussion on Properties of receptors
Your posts are moderated
Related Questions
Q. Can Serotonin used in consciousness? Serotonin complements the action of noradrenalin and acetylcholine in promoting wakefulness and cortical responsiveness. Experiments pro

in natural vegetative propagation which structure gives rise to new individuals?

Describe Assist Control Ventilation (ACV) The machine delivers a set tidal volume at the set rate; besides, each time the patient breathes on his own, a machine breath is init

Antibodies of dissimilar specificities, which react to the same antigen, are known as polyclonal antibodies.

State in detail about rocks A mass of mineral matter is called  rock. It may be composed of one or more minerals.  Some rocks are hard and compact e.g. granite and basalt, whil

Isolation and identification of the etiological agent: Isolation of the etiological agent is attempted in chicken embryos, cell cultures, laboratory animals, culture medi

Explain the Types of surgery ? Primary repair of ventricular septal defect has to be done whenever possible. III complex malformations associated with large VSD, pulmonary arte

Describe about the therapies of illicit drugs do to the brain Despite recent availability of new therapies for addiction, only a small proportion of people who need treatment

Why is the cerebellum more developed in mammals that jump or fly? The cerebellum is the major brain structure that coordinates the movement and the equilibrium of the body. For

Sphaerosome Also known as Plant lysosome , because they contain hydrolytic enzymes. Hanstei n first observed them and called microsomes . Discovered by Dangeared