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I been reading what a plant knows and this is such a great resource for deeper understanding. Idk why but that nociceptor bit that it can be activated by the 3 receptors blows my mind at how much sense that makes
Thank you, Doctor !! But I have a question. Isn't the word "open up the channels" not accurate? Because I know that in the eye, it's not opening, but closing to have an action potential.
Hi Dr. Mike, I'm currently writing a presentation on sensory receptors and was hoping you would be able to help by identifying the ions that are able to pass through a thermally gated channel?
This isnt actually considered pain. Bright light causes bleaching of the rods in your eyes. The only "flashbang" effect you perceive is coming from the rhodopsin in those rods. Light stimulation bleaches them, causing them to sort of "turn off." This is why the bright stimulus seems to hurt but it really isnt causing pain; its adapting your eyes to the intensity of the light. This is also why your pupils contract so fast. They dilated to allow more light to enter the cornea and pass through the gap (pupil) between the iris before being refracted around the entire retina rather than just the fovea. This is because your Rods are much better in the dark and are what allow you to make out shapes and structures as well as some distances. Coming into the light from a dark room causes immediate contraction of the circular muscles, pushing the sides of the iris closer together to prevent too many light rays from entering the eye (reflecting and refracting of light rays around the retina will disrupt true visual pathways since the light wouldn't be focused on the fovea, containing the vast majority of your cones.) This causes no release of action potentials. All the light does is cause graded potentials (IPSPs in the rods b/c of light) since both rods and cones are stimulated by light. Yes, light does, in fact, wear and tear on the rods and cones, but they are able to be healed by the retinal pigment epithelial cells through phagocytosis and this "damage" is unable to be felt. Any pain you actually feel in the eye (such as when you get dirt or an eyelash in it) are actually felt by those other somatosensory receptors. Your eyes have tons of them because they are very sensitive organs. That being said, photoreceptors only relay visual perception to the brain. Anything else that occurs in the eyes that cause a disruption are sensed by other sensory receptors which, in turn, relay that "change" to the brain.
Can someone explain sound to me.. under what type of sensory receptor does it fall into? It detects vibrations... but does that fall under mechanoreceptor or audio receptor? If I’m asking yet right question
In this video it appears to be that some nociceptors are signaling for you to lean to the right and not to the left. Maybe Dr. Matt could do a motion palpation to explore what and why.
Technically, nociceptors pick up varying levels of pain. Meaning, it's not the nociceptors at work but the mechanoreceptors. Those recognize physical distortion such as touch, pressure and vibration, which are located in tissues, ligaments, muslce and skin. Mechanoreceptors are also classified as proprioceptors. I learned that just from paying attention to the video and not the way he's leaning :D
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