Anatomy 101 Final Exam Ch 1-12 100% Correct Answers

Neurons that conduct impulses from the CNS to muscles or glands are Correct Answers motor neurons. Three general functions of the nervous system are Correct Answers integrative, motor, and sensory. A myelinated nerve fiber is ______, whereas an unmyelinated nerve fiber is ______. Correct Answers white, and composing the white matter of the brain and spinal cord; gray, and composing the gray matter of the brain and spinal cord Most of the neurons in the brain and spinal cord are Correct Answers multipolar. Which of the following neuroglia are not part of the CNS? Correct Answers Satellite cells Action potentials are related to impulses conducted along an axon in that Correct Answers propagation of a series of action potentials along a nerve cell fiber constitutes an impulse. A stimulus great enough to change the membrane potential and propagate an action potential is said to have reached _________. Correct Answers threshold The most rapid conduction of an impulse along an axon occurs on a fiber that is Correct Answers thick and myelinated. What is the correct sequence of events along an axon that follows a membrane reaching threshold potential? 1. The membrane depolarizes. 2. Sodium channels open and sodium ions diffuse inward. 3. The membrane repolarizes. 4. Potassium channels open and potassium ions diffuse outward. Correct Answers 2, 1, 4, 3 The neurotransmitter that controls skeletal muscle contraction is Correct Answers acetylcholine. T/F: The brain and spinal cord comprise the central nervous system Correct Answers True T/F: Nodes of Ranvier lie between neurons. Correct Answers False T/F: Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger attached to the surface of the brain, containing many nerves and blood vessels. Correct Answers pia mater impulse. Correct Answers True The meninges consist of Correct Answers the pia mater, arachnoid mater, and dura mater. The ____________ is the thin meninx