BIO271H1 Lecture Notes - Lecture 99: Spinal Cord, Endocrine System, Skeletal Muscle

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6 May 2016
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Receptors sense external + internal env afferent (sensory) cns integrates info cns sends out signal in response via motor division of pns. Cns: integrating signals sending signals out to other parts of body: brain, spinal cord. Pns: somatic: control of skeletal muscle - control, autonomic: control over all other tissues involuntary. Effector organs controlled by both antagonistic control o. Endocrine system sends signals and effects all tissues via hormones in the blood, the neurons have more specific control via the nervous system. Membrane potential: voltage difference across the membrane (many cells have this) these cells can rapidly change that membrane potential in response to an. Excitable cells: incoming signal: neurons are excitable cells transmit electrical signals over long distances. Rat purjinke neuron (major output neurons of the cerebellum) Glial cells: support brain cells, role in neurotransmission. Astrocytes: some are responsible for removing nt from synapse to stop a response. Neurons vary in structure and properties, but use the same mechanisms.

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