PHYS20008 Lecture Notes - Lecture 8: Capsaicin, Sense, Ultraviolet
10 May 2018
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Lecture 8
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- Proprioception: establish a sense where we are in space, know where all our limbs
are and what we are doing, awareness of where we are in space
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- Left: free nerve endings detect change, similar to neurons that detect blood pressure
(wrap around outside of blood vessels ⇒ when vessels expand due to increase in
blood pressure ⇒ sense the stretch on the surface of vessel with free nerve endings
⇒ report back blood pressure has increased), simple, basic, effective
- Middle: layer of connective tissue around the end (specially designed to detect
things), such as chemoreceptors that detect things like oxygen and carbon dioxide
levels
- Right: most advanced, specialised cell at top (evolved to specifically detect things),
specific cells that detect photons of light or detect vibrations coming through ear, that
cell communicates with next neuron in chain
- Take the bit of information → translate to something body can understand (doesn’t
understand vibration, neurons use electrical and chemical signals to communicate),
somehow have to take signals from environment (photons of light, vibration, stretch,
chemical levels) ⇒ translate that to something neurons can understand and report
back to CNS
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Document Summary
Proprioception: establish a sense where we are in space, know where all our limbs are and what we are doing, awareness of where we are in space. Report back blood pressure has increased), simple, basic, effective. Middle: layer of connective tissue around the end (specially designed to detect things), such as chemoreceptors that detect things like oxygen and carbon dioxide levels. Right: most advanced, specialised cell at top (evolved to specifically detect things), specific cells that detect photons of light or detect vibrations coming through ear, that cell communicates with next neuron in chain. Five senses: smell use left neurons; all other senses hearing, sight etc use specialised cells that report to a neuron (e. g. photoreceptors and hair cells), detect physical energy and synapse on sensory organs. Mechanoreceptors: detect mechanical changes, mostly to do with stretch, e. g. changes in blood pressure, vibration, acceleration (when comes to equilibrium) Thermoreceptors: four types: hot, cold, painful hot (46 degrees, capsaicin receptors.
