Sensory Receptors
Define the meaning of 'sensory receptors'
A nerve ending that sends signals to the central nervous system when it is stimulated.
Define 'mechanoreceptors'
respond to physical forces in touch, hearing, and pressure.
Define 'photoreceptors'
Photoreceptors are neurons in the retina of the eye that change visible light from the electromagnetic spectrum into signals.
Define Nociceptors
Sensory nerves that respond to the pain when tissue is damaged in the skin, muscles, joints, bone and internal organs through mechanical, thermal, or chemical stimuli.
Define 'chemoreceptors'
Respond to chemicals in taste and smell and in internal changes.
About how many types of sensory receptors are there?
About 18~20
What are the most sensitive mechanoreceptors?
The most sensitive mechanoreceptors are in the top layers of the skin, especially non-hairy skin. (tongue, eyelids, lips, etc.)
Define 'cones'
Photoreceptors that allow us to see in colors
"hurt" in latin
Define 'Olfactory receptors'
Respond to chemical odors (distance chemoreceptors)
What are the major colors your eyes can see(cones)?
The major colors are red, blue, and green.
How many nociceptors are there in your body?
There are over 3 million pain receptors in your body.
Define 'gustatory receptors'
Respond to chemical flavors (direct chemoreceptors)
Define 'rods'
Photoreceptors that are activated by light but do not register any color. (night vision, low light vision)
Why is pain good for you? How does the nociceptors release the pain?
Pain is good for you because it is a warning so that you don't damage any part of your body whether it's internal or external. The nociceptors send brain signals.
Define 'papillae'
Little bumps on your tongue that contain taste buds.
Define 'color blindness'
A decreased or limited ability to see colors.
How many taste buds are in your tongue? How much or less does your taste buds increase or decrease as you age?
There are 5,000-10,000 taste buds on your tongue. As you age, you lose more taste buds. So often younger people have more taste buds.