The retina contains layers of neurons specialized to respond to light (see Figure 5.9, “The Retina with Its Specialized Cells”). As light falls on the retina, it first activates receptor cells known as
rods and cones
.
When receptor cells for the senses are activated the process called?
| Question Answer | When receptor cells for the senses are activated, the process called _______ has begun. Sensation | You have a piece of candy that you are holding in your mouth. After a while, the candy doesn’t taste as strong as it did when you first tasted it. What has happened? Sensory adaptation |
|---|
What do we call the activation of receptors in the various sense organs?
Sensation
. The activation of receptors in the various sense organs.
What are sensory receptors in the eye?
Photoreceptors are neurons in the retina of the eye that change visible light from the
electromagnetic spectrum into signals that are perceived as images or sight
. Rods and cones are two types of photoreceptors located at the back of the eye. Cones allow us to see color. There are red, blue, and green cones.
What sensory receptors are triggered by chemical substances?
A chemoreceptor, also known as chemosensor
, is a specialized sensory receptor cell which transduces a chemical substance (endogenous or induced) to generate a biological signal.
What are the five sensory receptors?
- Chemoreceptors detect the presence of chemicals.
- Thermoreceptors detect changes in temperature.
- Mechanoreceptors detect mechanical forces.
- Photoreceptors detect light during vision.
- More specific examples of sensory receptors are baroreceptors, propioceptors, hygroreceptors, and osmoreceptors.
What are the 4 receptors of the skin?
Cutaneous receptors
Four receptor structures of the glabrous skin provide this information:
Merkel discs, Meissner corpuscles, Pacinian corpuscles, and Ruffini endings
.
Which skin receptors respond only to pressure?
What skin receptors respond only to pressure?
Meissner’s corpuscles
respond to pressure and lower frequency vibrations, and Pacinian corpuscles detect transient pressure and higher frequency vibrations. Merkel’s disks respond to light pressure, while Ruffini corpuscles detect stretch (Abraira & Ginty, 2013).
How a stimulus becomes a sensation?
Sensory receptors become activated by stimuli in the environment
by receiving signals
. The transmission of any message in the neurons of our body requires it to be in the form of an action potential; the sensation must undergo conversion into electrical signals.
What are the 5 sensory modalities?
The basic sensory modalities include:
light, sound, taste, temperature, pressure, and smell
.
What are the two types of eye defects?
These are (i)
myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia
. Myopia is also known as near-sightedness.
Where are the sensory receptors in the eye?
The sensory receptors of the eyes are the rods and cones, which are located
in the retina
.
What two layers does the retina consist of?
The cellular layers of the retina are as follows: 1) The pigmented epithelium, which is adjacent to the choroid, absorbs light to reduce back reflection of light onto the retina, 2)
the photoreceptor layer contains photosensitive outer segments of rods and cones
, 3) the outer nuclear layer contains cell bodies of the …
Are sensory receptors located in blood vessels?
These are sensory receptors that are located in blood vessels and visceral organs and their signals are not usually consciously perceived. This type of sensory receptor responds to stimuli resulting from physical or chemical damage to tissue.
What are receptors give examples?
| Sense organ Stimulus | Tongue Chemicals (in food and drink, for example) | Nose Chemicals (in the air, for example) | Eye Light | Ear Sound |
|---|
What are phasic receptors?
Phasic receptors are
rapidly adapting and signal temporal changes in the stimulus
. Phasic receptors are usually not very good at signaling stimulus intensity. They are good at detecting rapid changes such as stimulus onset, movement, and termination of a stimulus event.
