20. The presence of cholinesterase in the human nervous system allowsa. One way impulse transmissionb. More rapid impulse conductionc. Arecovery period by destroying acetylcholined. Acetylcholine to continue stimulating dendrites21. The threshold of a neuron refers toa. The polarity of 0.07 mVb. The minimum stimulus required to achieve depolarizationc. The stimulus needed to achieve equal concentrations of sodium ions and potassiumions within the neurond. The stimulus needed to achieve sodium ion equilibrium between the cytoplasm andextracellular fluid (ECF)

Cholinesterase in neuronal cells is an enzyme that plays an important role in the propagation of…

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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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5. Which of the following is the neurotransmitter at the autonomic ganglia? a. acetylcholine b. norepinephrine c. epinephrine d. nicotine 1 6. Increased blood flow to skeletal muscle is best achieved by activation of which receptor? a. 0₁ b. B₁ 1 C. 0₂ d. B₂
12. Magnesium only blocks the pore of the NMDA receptor when the neuron is very depolarized. a. True b. False
6. The short period of time when the nerve is not responsive to stimuli it’s termed the: A. Adaptation period B. Accommodation period C. Refractory period D. Resting period
20. Which of the following neurotransmitter(s) have been functionally linked to Alzheimer’s disease? a. nitric oxide b. endocannabinoids c. acetylcholine d. a and b e. b and c
which of the following cell types contain ATP- dependent K+ channels and voltage-gated Ca++ channels a. alpha cells of the pancreas b. fat cells c. liver cells d. beta cells of the pancreas e. muscle cells
15. In a myelinated axon on the nerve impulse travels from A. Schwann cells to nodes B. Node to node C. Myelin to Myelin D. Axon to axon
7. Cell A is a glutamatergic neuron with a single synapse onto Cell B. Which of the following events would NOT result in an increased postsynaptic response in Cell B caused by an action potential in Cell A? a. Increase in the amount of glutamate released from Cell A b. Increase in the number of AMPA receptors on the surface of Cell B c. Increase in the number of GABA receptors on the surface of Cell B d. Addition of more synapses between Cell A and Cell B e. These would all increase the postsynaptic response
9. In an inhibitory synapse, neurotransmitter binding to a receptor cause opening of __________ resulting in a hyperpolarizing event and reduces likelihood of AP generation. a. sodium ion channels b. potassium ion channels c. chloride ion channels d. a and b e. b and c
8. All of the following conditions would have same effect on muscles (flaccid paralysis) as muscular dysgeny with a single exception. What is the exception? A. Exposure to botulinum toxin, which blocks release of ACh at the NMJ. B. Poisoning with atropine, an antagonist of muscarinic receptors C. Poisoning with curare, an antagonist of nicotinic receptors D. Myasthenia gravis, an autoimmune disease in which the nicotinic attacked by the immune system and cannot receptors are function normally.
25. The stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. Which type of gating mechanism do these cells use? a. voltage-gated b. extracellular ligand-gated c. intracellular ligand-gated d. mechanically gated e. G-protein gated
8. When a nerve impulse reaches the nerve endings the permeability of the A. Presynaptic membrane to potassium increases B. Presynaptic membrane to sodium decreases C. Presynaptic membrane to calcium increases D. Presynaptic Membranes of calcium decreases
9. All of the followings are incorrect about the Graded Potential, except ------------------------- A. It spreads Electrotonically B. It is amplified by distance C. It is inversely proportional to the duration and magnitude of stimulus D. It is regenerative E. it is generated at the axon hillock

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20. The presence of cholinesterase in the human nervous system allows a. One way impulse transmission b. More rapid impulse conduction c. A'recovery period by destroying acetylcholine d. Acetylcholine to continue stimulating dendrites