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Canada (161,561)
Psychology (9,695)
PSYA01H3 (1,206)
Steve Joordens (1,058)

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Steve Joordens

Chapter 4 Donald Webbs major contribution were his understanding of the relation between the individual nerve cell, larger network, and higher processes Module: a cluster of nerve cells that communicate with each other Nerves are bundles of fibres with which the central nervous system communicates with the rest of the body (CNS communicates with the rest of the body through the nerves) Brian stem must have pons, which are involved in controlling some stages of sleep. It CANNOT however, have a thalamus Cerebellum controls and coordinates walking and running Cerebrospinal fluid protects the brain and spinal cord from the bones that surround them The surface of the cerebral hemispheres is covered by the cerebral cortex (Cerebral cortex is on he surface of the cerebral hemispheres) Cerebral cortex does NOT function in the formation of emotions Myelin covering of the neurons is what gives the white colour (Myelin = white colour or neurons) One function of the soma is to receive messages from the neurons Axon carries message towards terminal buttons (message is carried to the terminal buttons from the axon) Synapses can occur both on the smooth surface and the spine of dendrites Neurotransmitters are NOT released from terminal buttons of dendrites (released from neurons) MS (multiple sclerosis) involves the deterioration of the myelin sheaths Axon is resting, the outside is resting at +70 millivolts with respect to it Actively pumping ions out, must be a transporter Inside of axon is more negatively charged than the outside because the AXON produces more negative ions and fewer positively charged ions + + Na comes in, and K goes out of axons Motor neurons synapse with muscle cells and regulate their contractions Rate of firing of the neuron controlling the muscle determines the strength of the muscular contraction Inhibitory synapses prevent the firing of a postsynaptic neuron, whereas excitatory synapses ensure the firing of a postsynaptic neuron. The type of neuron relaying messages to the spinal cord is called a sensory neuron Neurotransmitter receptor is the protein molecule located in the membrane of the postsynaptic neuron that enables it to be excited or inhibited Most of the ion channels in the excitatory synapse allow for sodium to enter the neuron Most of the ion channels in the inhibitory synapse allow for potassium to leave the neuron Most synapses, effect of neurotransmitters are terminated by reuptake, which is where the neurotransmitters are retrieved by the terminal buttons Drug increases the rate of reuptake, the effect of the neurotransmitter is diminished. Retarding the rate of reuptake, the effect of the neurotransmitter is prolonged Block the postsynaptic receptor, diminish the effect of the neurotransmitter www.notesolution.com
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