Which is NOT true of myelin? A) It covers all parts of the neuron, including the
ID: 79913 • Letter: W
Question
Which is NOT true of myelin? A) It covers all parts of the neuron, including the axon, cell body, and dendrites. B) It influences the velocity of conduction of an electrical signal down an axon. C) It is formed by glial cells. D) It is a fatty membranous sheath. Which is TRUE about receptor potentials? A) They always trigger action potentials. B) They propagate without decrement. C) They are action potentials. D) They generally occur at the axon hillock of afferent neurons. E) They vary in magnitude with stimulus strength. Which is TRUE regarding diffusion? A) It depends upon the random motion of molecules. B) It requires integral membrane proteins to occur. C) It is the principal mechanism by which molecules are moved over large distances in the body. D) It requires energy in the form of ATP. E) It results in net movement of molecules from regions of low concentration to regions of high concentration. What are the most common receptors for hydrophilic intercellular messenger molecules? A) peripheral membrane proteins B) intracellular proteins C) nucleic acids D) integral membrane proteins E) specialized phospholipids within the membrane Which structure is NOT part of the "anatomical dead space"? A) bronchiole B) respiratory bronchiole C) bronchiole D) terminal bronchiole E) trachea Which of the following is not true of a polar chemical bond? A) It has no net electrical charge. B) It is ionized. C) It has opposite electrical charge at each end. D) It is covalent.Explanation / Answer
12 A. It covers all the parts of neuron including axon cell body and dendrites.
myelin covers the axonal part of neuron.
13. A. They always trigger action potential.
Receptor potential is generally a depolarizing event resulting from inward current flow. The influx of current will often bring the membrane potential of the sensory receptor towards the threshold for triggering an action potential.
14. A. It depends upon the random motion of molecules.
15. A. Peripheral membrane proteins.
16. B. Respiratory bronchiole.
anatomical dead space starts from mouth and ends at terminal bronchiole.
17. B. It is ionized.
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