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Flashcards in Sensory Physiology Deck (8)
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0
Q

Mechanoreceptors

A

Respond to mechanical stimuli (pressure/stretch)
Responsible for many types of sensory info: touch, blood pressure, and muscle tension.
These stimuli alter the permeability of ion channels on the receptor membrane, changing the membrane potential.

1
Q

Adequate stimulus

A

The type of stimulus to which a particular receptor responds in normal functioning

2
Q

Thermoreceptors

A

Detect sensations of cold or warmth

3
Q

Photoreceptors

A

Respond to particular ranges of light wavelengths

4
Q

Chemoreceptors

A

Respond to the binding of particular chemicals to the receptor membrane.
Provide the senses of smell/taste and detects blood pH and oxygen concentration.

5
Q

Nociceptors

A

Sense pain due to actual or potential tissue damage.
Can be activated by a variety of stimuli such as heat, mechanical stimuli such as excess stretch, or chemical substances in the EC fluid of damaged tissues.

6
Q

Receptor potential and it’s role in signal transduction

A

Receptor potential = a graded potential
Produced via the opening of ion channels (in a specialized region of the receptor membrane located at the tip of a single axon or on associated specialized sensory cells) which allows a change in ion flux.
Increase in the graded potential magnitude

7
Q

Phantom limb

A

Lost limb is experienced as though it were still in place.
The missing limb is percieved to be the site of tingling, touch, pressure, warmth, itch, wetness, pain, and fatigue.
Sensory neural networks in the CNS that are normally triggered by receptor activation are instead activated independently of peripheral input. The activated networks continue to generate the usual sensations, which the brain perceives as arising from the m