MODULE 11: SENSES Flashcards
Process initiated by stimulating sensosry receptors.
Sensation
Concious awareness of stimuli received by sensory neurons
Perception
Means by which the brain receieves information about environment and the body.
Senses
Nerve ending specialized cells capable of respondint to stimuli
Sensory Receptors
Respond to mechanical stimuli
Mechanoreceptors
Responds to chemicals
Chemoreceptors
Respond to light
Photoreceptors
Respond to temperature changes
Thermoreceptors
Respond to stimuli that results in sensation of pain
Nocireceptors
Types of sensory receptors
- Free Nerve Endings
- Temperature Receptors
- Touch Receptors
Simplest and common types of receptor
Free Nerve Endings
Can only respond to temperature between 12°c and 47°c
Temperature receptors
Respond to decreasing temperature
Cold Receptors
Respond to increasing temperature
Warm Receptors
More complex and most are enclosed by capsules
Touch Receptors
Small, superficial nerve endings: detects light touch and superficial pressure
Merkel Disks
Detect light but not discriminative
Hair Follicle Receptors
Deep to epidermis; for fine and discriminative touch
Meissner Corpuscles
Deeper tactile receptors; detect continuous pressure in skin
Ruffini Corpuscles
Deepest receptors associated with tendons and joints
Pacinian Corpuscles
Group of unpleasant perceptual and emotional experience
Pain
Two types of pain
- Localized
- Diffuse
Sharp, picking, resulting to rapidly conducted action potential
Localized
Burning or aching, resulting from action potential that propagated slowly
Diffuse
