RECEPTORS IN MAN:
Receptors are the sensory organs which receive a stimulus. Following
are the main receptor organs in man:
- Organ of sight.
- Organ of hearing.
- Organ of smell.
- Organ of taste.
- Organ of touch.
Sight:
The eyes are the most marvelous of the sense organs as they
make us aware of various objects around us, nearby and far away. When we see a
tree we don’t have to touch it or climb its branches in order to know what it
is like. With normal vision we can reach out as far as our eyes can see and are
thus becoming aware of events and circumstances around us. These eyes are the
great bliss of Almighty Allah.
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| Sight receptor in human body |
Ears:
The ears are the most amazing and spectacular organs in our
body. These are one of the best endowed by Allah. The ears lend a hand us to hear
everything we want. There are frequency ranges, but human ear can only hear in the
frequency range between 20Hz to 20,000Hz. This is called audible frequency.
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| hearing receptor in human body |
Smell:
The organ of smell lies in the nasal cavity above mouth. It is
also called the olfactory organ and its sensitive cells are supplied by the
branches or the olfactory nerve from the brain. The incoming air currents carry
the smell particles of substances into the nasal cavity which arouse the
sensitive cells in the organ of smell. The olfactory nerve carries the
sensation to the brain, which determines the nature of a substance emitting the
smell.
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| smell receptor in human body |
Touch:
There are encapsulated nerve endings in the skin, which
respond to slight pressure on the skin. The skin responds to heat and cold
also. Experiments have shown that the spot in the that respond to cold don’t
respond to heat and vice versa. It is also known that any stimulus that affects
the free and exposed nerve endings produce the sensation of pain. Some sensory
receptors are placed deeper in the tissues and are not stimulated unless the
tissues above are firmly compressed.
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| touch receptor in human body |
Taste:
It is generally believed that the entire tongue is the organ
of taste, but it is not so. The tiny organs of taste are located on the surface
of the tongue. These are called the taste
buds. They are spherical in shape and microscopic in size. A taste bud
consists of a group of cells that are supplied with nerve endings from the
nerve that penetrates the inner part of the mouth cavity. There are four kinds
of taste buds, each kind specified to seek a particular taste, i.e. sweet,
salty, sour and bitter. Those for salty taste are situated along with those for
bitter taste on the side of the tongue and for sweet taste at the tip of the tongue.
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| taste receptor in human body |
Author of This Article,
Very great dear. . . . . .
ReplyDeleteWhat is the function of Eustachian tube in Ear?
ReplyDeleteThe eustachian tube (pharyngotympanic tube) connects the middle ear cavity with the nasopharynx. It aerates the middle ear system and clears mucus from the middle ear into the nasopharynx. Opening and closing functions of the eustachian tube are physiologically and pathologically important.
DeleteCan you tell why we have burning sensation with chilies?
ReplyDeleteChile like Red or Green or anyone?
DeleteCapsaicin, a component in Chilies is responded by receptors in a tongue which trigger burning sensation. For relief in burning sensation don't use water, always use some fats like bread, milk etc.
DeleteYa, we people always rush for water whenever we experience burning sensation of chilies. We should use fats as told by admin because fats can easily dissolve Capsaicin while water can't...
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