BIO 161 Lecture Notes - Lecture 5: Homeostasis, Cerebrospinal Fluid, Otto Loewi
Document Summary
Three interconnected functions of the nervous system: sensation: receives information about changes inside and outside of the body, integration: integrator) interprets the changes (processor or, response: initiates action (output) in the form of muscular contractions or glandular secretions. Stimulus sensor (sends data to control center) control center (directs response to stimulus) effect to normal) (negative homeostasis feedback and return. Two divisions: central nervous system (cns): the brain and spinal cord; control center for the entire system, peripheral nervous system (pns): nerves and ganglia; nervous tissue outside cns. Nerves: bundles of axons (and dendrites) outside cns. Ganglia: clusters or neuronal cell bodies outside cns. Specialized to receive information and send signals. Found in brain, spinal cord, and nerves. Two major cell types: neurons, neuroglia. Integration (interneurons: interneuron (associative neuron, processor or integrator, interprets signals, located entirely in cns, connects afferent to efferent, receives information from sensory neurons and other interneurons, sums up information, signals motor neurons.
