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UNE PHSL 1010 Exam 1 Study Guide With Questions And 100% Correct Answers Latest Update
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UNE PHSL 1010 Exam 1 Study Guide With Questions And 100% Correct Answers Latest Update...
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UNE PHSL 1010 Exam 1 Study Guide With Questions And100% Correct Answers Latest Update
How are action potentials propagated along an axon? - ANSWER The action potential
generated at the axon hillock propagates as a wave along the axon. The currents
flowing inwards at a point on the axon during an action potential spread out along the
axon, and depolarize the adjacent sections of its membrane.
The myelin sheath, if present on the axon, would speed the propagation by allowing
saltatory conduction, or jumping of the action potential between nodes of Ranvier.
how are potentials measured in excitable tissues? ANSWER They are due to changes in
the conduction of ions across the cell membrane. The electrical events in neurons are
rapid, being measured in milliseconds (ms); and the potential changes are small, being
measured in millivolts (mV).
sensory neurons (afferent) - ANSWER neurons that carry incoming information from the
sensory receptors to the brain and spinal cord
motor neurons [efferent]- ANSWER neurons that carry outgoing information from the
brain and spinal cord to the muscles and glands
Organization of the Nervous System- ANSWER central nervous system and peripheral
nervous system
Central Nervous System [CNS]- ANSWER brain and spinal cord
Peripheral Nervous System [PNS]- ANSWER the sensory and motor neurons that
connect the central nervous system [CNS] to the rest of the body.
, Somatic Motor Neurons PNS - ANSWER responsible for carrying neural messages from
spinal cord to skeletal muscles
integral proteins - ANSWER Penetrate the hydrophobic interior of the lipid bilayer.
Commerce via facilitated or active.
peripheral protein - ANSWER A protein loosely bound to the surface of a membrane or
to part of an integral protein and not embedded in the lipid bilayer.
Carbohydrate group - ANSWER Linked with protein or lipids and function as adhesion.
Cholesterol - ANSWER Steroid common in cell membranes, also in many hormones.
Functions as support make the membrane more rigid and less soluble.
Structural protein - ANSWER 1. Help create cell junctions that hold tissues together
2. Connect membrane to cytoskeleton to maintain the shape of the cell
3. Attach cells to the EC matrix by linking cytoskeleton fibers to EC collagen and other
protein fibers.
Plasma Membrane Enzyme (Protein) - ANSWER Catalyze chemical reactions that occur
inside or on the outside surface of the cell.
Transfer signals from the EC environment to cytoplasm.
Membrane Receptor Proteins - ANSWER Membrane protein with attached
carbohydrates that aids the cell in distinguishing "self". Involved in blood types, organ
transplants, and germ recognition.
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