Sense Organs

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Sense organs receive external or internal changes and are called receptors. They detect stimuli, send information to the brain, and help the body produce a response. Without them, the body cannot sens…

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A stimulus is a change in the environment or within the body which produces response. Examples include light entering the eye, sound reaching the ear, or a change inside the body that needs attention.

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An effector is a body part whose activity leads to a response. It may be muscles or glands. For example, muscles help in movement, and glands help in secretion.

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A receptor detects a stimulus and sends information to the brain through nerve fibres. The brain analyses the information and sends instructions to an effector. The effector then produces the response…

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Exteroceptors are receptors present outside the body and detect changes from the external environment. Interoceptors are receptors present within the body and detect internal changes such as pH, oxyge…

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Mechanoreceptors detect sound, touch, and other vibrations and pressure. Ears and skin are examples of mechanoreceptors.

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Thermoreceptors sense any change in temperature of the environment. Nerve endings in the skin act as thermoreceptors and help the body feel hot and cold.

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Chemoreceptors sense chemical stimuli. Receptors in the nose and on the tongue are chemoreceptors and help in smell and taste.