2. Sensory - SENSORY RECEPTORS There are several different...

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SENSORY RECEPTORS There are several different ways of classifying sensory receptors. These are indicated in the table. All receptors have submodalities, e.g. the rods and cones in the eye. Humans do not have receptors for all agents. For example, we cannot detect magnetic fields or electric fields. These kinds or receptors are found in birds and fish. In addition, the range of sensations in humans may differ from that in other species. Dogs can hear higher frequencies; bees can detect UV radiation. The adequate stimulus is the main stimulus to which the receptor responds. We can see flashes of light if we press on the eyeball, but the eye is not considered a mechanoreceptor. On the other hand, some cutaneous receptors respond to both temperature and pressure changes, and both are considered adequate stimuli. Pain receptors respond to a large class of stimuli if they are sufficiently intense. Most mechanoreceptive information is carried to the spinal cord over axons in the peripheral nerves. The cell bodies of these axons are in the dorsal root ganglia.
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Most mechanoreceptors or stretch receptors respond to stimulation by causing a local depolarization, sometimes called a receptor potential or generator potential. The mechanism is not well understood – it may be just a general permeability increase with a reversal potential near 0 mV. The receptor potential is graded, i.e. increasing the stimulus intensity causes a graded
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This note was uploaded on 04/18/2008 for the course PHYS 1010 taught by Professor Thompson during the Fall '07 term at New York Medical College.

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2. Sensory - SENSORY RECEPTORS There are several different...

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