PSYB30H3 Chapter Notes - Chapter 5: Vagus Nerve, Extracellular Fluid, Electron Microscope
Document Summary
Bradycardia: conserves the body"s oxygen when you are not breathing. Acetylcholine (ach): chemical messenger transmitter that activates skeletal muscles: may either excite or inhibit internal organs in the autonomic system (inhibit heart rate/ slow it down) Epinephrine (ep)/ adrenaline: the chemical that carries the message to speed up heart rate (produced by the adrenal glands) Norepinephrine: the chemical that accelerates heart rate in mammals. Neurotransmitters: messenger chemicals released by a neuron onto a target to cause an excitatory or inhibitory effect are referred to as neurotransmitters. Hormones: many of the same chemicals circulating in the bloodstream outside the central nervous system (travel to distant targets, slower compare to neurotransmitters) The resolution of an electron microscope is much higher than that of a light microscope because electron waves are smaller than light waves. The dark patches on the dendrite consist mainly of protein receptor molecules that receive chemical messages. Microtubule: transport structure that carries substances to the axon terminal.
