BIO 2000 - Concepts in Human Physiology - Final Exam Questions and Answers

During the initiation of an action potential.. Sodium ion channels open and sodium ions enter the axon Organelles of the cytoplasm: Ribosomal endoplasmic reticulum, mitochondrion, lysosome, Golgi apparatus % of protein in organic matter of the body approx over 50% Factors regulated by body systems blood oxygen levels, blood temperature, body water content, blood electrolyte levels RNA's the cell produces Messenger RNA (mRNA), Transfer RNA (tRNA), Ribosomal RNA (rRNA) Organelle that contains genetic info nucleus Saltatory conduction involves the action potential jumping from one node of Ranvier to the next, is faster than conduction along an unmyelinated axon functions of a neuron basic unit of the nervous system, is a nerve cell, generates electrical signals, communicates with other cells via chemical signals examples of polysaccharides starch, glycogen and cellulose Triglyceride 3 chains of fatty acid attached to glycerol Cerebrospinal fluid is found in ventricles of the brain, is found in spaces around the brain where it cushions the brain from damage, is found in the central canal (cavity) of the spinal cord Sensory Neurons neutrons that pick up sensations from receptors and carry them to the brain or spinal cord Hypothalamus thermostat of the body since it regulates temperature , also controls water balance and metabolism