All motor neurons release acetylcholine as a neurotransmitter except a. Postganglionic sympathetic neurons b. Somatic motor neurons c. Postganglionic parasympathetic neurons d. Specific cardiac and smooth muscle fibers
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- Somatic motor neurons have axons the conduct signals from the CNS to _ ; and are usually under _ control. a. Skeletal muscle; involuntary b. Hollow organs; voluntary c. Hollow organs; involuntary d. Skeletal muscle; voluntaryThe central nervous system is connected with the peripheral nervous system by all the following types of nerve fibers, except :-a- postganglionic autonomic fibersb- preganglionic autonomic fibersc- somatic motor fibersd- autonomic sensory fibersSelective destruction of a motoneurons in the spinal cord will have which of the following effects on the affected muscles?A) Flaccid paralysisB) HypertrophyC) Lead-pipe rigidityD) RigidityE) Spastic paralysis
- Fill in the blankes The somatic motor neurons innervating the __________________ of the lower limbs are located in the _________________ of the spinal cord. A. smooth muscles; lumbar region B. skeletal muscles; cervical region C. skeletal muscles; lumbar region D. skin; cervical region5) Lower motor neurons are _____________ neurons. A. multipolar B. bipolar C. unipolar D. anaxonic B. bipolar C. unipolar D. anaxonicCell bodies of UMN that synapse on LMN lie in all of these areas EXCEPT a) Medulla b) Thalamus c) Pre-motor cortex d) Pons e) Primary motor cortex
- which of the following does not describe the somatic nervous system? A. motor neurons that innervate glands, cardiac and skeletal muscle B. a system of motor neurons that innervate all muscle cells c. voluntary nervous system d. general sensory for skin and joints.γ-motor neuron discharge to a muscle is inhibited by impulses reaching the γ-motor neurons from all the following source, except :-a- Golgi tendon organs of the same muscleb- spindles of antagonistic musclesc- medullary reticular formationd- pontine reticular formationThe ____ cannot be controlled by conscious thought. a. motor neurons b. somatic nervous system c. autonomic nervous system d. skeletal muscles
- A person is warming their feet by a fire. Which of the following statements is TRUE? O A. The medial section of the post-central gyrus will be active. B. The lateral section of the pre-central gyrus will be active. OC. There will be an increase in frequency of action potentials along the medial lemniscal system. D. There will be decreased frequency of action potentials along the spinothalamic tract.Post-synaptic acetylcholine receptors are blocked by A.Calcium ions B.Atropine C.Nerve gases D.CurareIn the autonomic nervous system, the lower motor neurons directly innervate effector organs. there is always a synapse between the CNS and the effector organ. \ motor neurons do not synapse but are connected by gap junctions. the cell bodies of all motor neurons are found in ganglia outside the CNS. neurons have dendrites but no axons.