BIOL 0130 Lecture Notes - Lecture 15: Thermoreceptor, Far-Sightedness, Cerebral Cortex

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Nervous System (Senses):
Sensory receptors are specialized cells that detect certain types of stimuli.
Types of Sensory Receptors:
Chemoreceptors:
Respond to chemical substances in the immediate vicinity.
Sense of taste & smell.
Monitor blood oxygen levels.
Photoreceptors:
Respond to light energy.
Sense of vision.
Rod cells are black and white vision.
Cone cells are colour vision.
Mechanoreceptors:
Stimulated by mechanical forces, which most often result in pressure of some sort.
Responding to fluid borne pressure waves when we detect changes in gravity and
motion, helping us keep our balance.
Sense of touch and hearing.
Thermoreceptors:
Located in the hypothalamus and skin.
Stimulated by changes in temperature.
Sense of touch.
Nocireceptors:
Pain receptors, which are sensitive to chemicals released by damaged cells.
Sense of touch.
Detection vs. Sensation vs. Perception:
Detection: occurs when environmental changes, such as pressure to the fingertips or light to the
eye, stimulate sensory receptors.
Sensation: occurs when nerve impulses arrive at the cerebral cortex of the brain.
Perception: occurs when the brain interprets the meaning of stimuli.
Farsightedness VS Nearsightedness:
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