WHAT IS LIFE? GDE.TO BIO.W/PHYS.-ACCESS
5th Edition
ISBN: 9781319360719
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 24, Problem 6MC
Summary Introduction
Introduction:
The myelin sheath insulates the axon, and aids in the conduction of electrical impulses.
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Glutamate's effect when it binds with protein receptors on the post synaptic membrane is to:
a. Initiate movement of potassium ions out of the membrane
b. Initiate movement of sodium ions into the membrane
c. Initiate movement of sodium ions out of the membrane
d. Initiate movement of potassium ions into the membrane
GABA is an example of an inhibitory neurotransmitter. Drugs that increase the level of GABA are used to treat diseases such as epilepsy where the signal transmission needs to be impaired.
The effect of the inhibitory neurotransmitter on the postsynaptic membrane is to:
a. hyperpolarize the postsynaptic membrane
b. decrease the threshold level
c. depolarize the postsynaptic membrane
d. maintain the resting potential
Calcium is vital for bone growth, but it's also an important part of neural transmission.
Calcium is required for the axon terminal to:
a. Reuptake the neurotransmitter via exocytosis
b. The neurotransmitter to be released by endocytosis
c. The neurotransmitter…
What are all the possible ways that a neurotransmitter is removed from the synaptic cleft? Select all that apply.
A. Taken up by postsynaptic transporters
B. Taken up by presynaptic transporters
C. Broken down by enzymes in the cleft
D. Broken down by enzymes in the presynaptic side
E. Broken down by postsynaptic enzymes
All of the following statements correctly describe a polarized membrane EXCEPT which?
a. There is a separation of the charge by a membrane, resulting in its ability to do work.
b. An RMP of –60 mV indicates that there are more positive ions inside the axon than an RMP of –70 mV.
c. A resting membrane potential (RMP) of –90 mV indicates the there are more positive ions inside the axon than an RMP of –70 mV.
d. There is a difference in the charges found on the inside of the membrane to the outside.
Chapter 24 Solutions
WHAT IS LIFE? GDE.TO BIO.W/PHYS.-ACCESS
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- GABA is an example of an inhibitory neurotransmitter. Drugs that increase the level of GABA are used to treat diseases such as epilepsy where the signal transmission needs to be impaired. The effect of the inhibitory neurotransmitter on the postsynaptic membrane is to: Select one: a. decrease the threshold level b. hyperpolarize the postsynaptic membrane c. depolarize the postsynaptic membrane d. maintain the resting potentialarrow_forwardPut the following in the correct order. A. Neurotransmitter release B. Ca²+ entry into the presynaptic terminal C. Axonal action potential D. Fusion of synaptic vesicle with the presynaptic plasma membrane E. Opening of voltage-gated Ca2+ channels F. Depolarization of the presynaptic terminalarrow_forwardOrganophosphate pesticides inhibit the action of acetylcholinesterase. What effect does this have in the cell? Select one: a. It prevents synthesis of ACh in the presynaptic terminal causing less neurotransmitter release b. It prevents breakdown of ACh in the synapse causing increased activity at the postsynaptic cell c. It prevents reuptake of ACh into the presynaptic terminal causing increased activity at the postsynaptic cell d. It prevents binding of ACh on the postsynaptic cell causing less activity e. It prevents reuptake of ACh into the presynaptic terminal causing less neurotransmitter synthesis.arrow_forward
- Relatively high velocity (speed) action potential propagation is a feature of axons that have which of the following: a. additional mitochondria b. reduced absolute refractory period c. fewer potassium channels d. a myelin sheath Which effect listed below would characterize the drug as a serotonin agonist? a. Stimulating monoamine oxidase to reduce available serotonin b. Binding and activating a postsynaptic serotonin receptor c. Increasing the efficiency of a serotonin transporterarrow_forwardLike many neurotransmitters, serotonin (5-HT) can have different postsynaptic effects on different neurons. Which of the following is the best explanation for these differences? a. There are several types of postsynaptic receptors for serotonin b. The brain releases different forms of serotonin at different synapses c. It depends whether it is an original serotonin molecule or one that has been recycled d. The width of the synaptic cleft varies from one synapse to another Which chromosomal pattern is conisdered typical of male humans? a. XYY b. XX c. YY d. XYarrow_forwardDepression is a condition in which sufferers may feel low mood, lack of motivation and sleep. It is caused by a lack of serotonin in the synaptic cleft of neurone pathways. Serotonin is a neurotransmitter. a) Describe how serotonin acts as a neurotransmitter. Using your understanding of synaptic transmission, explain how communication between neurones in serotonin pathways of the brain would be affected in someone with depression. b) Doctors use tubocurarine drug as an anaesthetic as it temporarily paralyses muscles. It blocks receptors at neuromuscular junctions. Why does this lead to paralysis?arrow_forward
- All the following are the right description of communication between neurons EXCEPT Select one: a. Communication between two neurons happens in the synaptic cleft b. Communication between two neurons happens in the form of neural impulse c. Communication between two neurons happens when the neurotransmitter binds to its receptor on a receiving cell d. Communication between two neurons happens through chemical neurotransmitterarrow_forwardWhich of the following statements regarding polarized membranes is incorrect? a. There is a separation of the charge by a membrane, resulting in its ability to do work. b. An RMP of –60 mV indicates that there are more positive ions inside the axon than an RMP of –70 mV. c. A resting membrane potential (RMP) of –90 mV indicates the there are more positive ions inside the axon than an RMP of –70 mV. d. There is a difference in the charges found on the inside of the membrane to the outside.arrow_forwardThe following steps refer to various stages in transmission at a chemical synapse. 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which step occurs first in transmission at a chemical synapse? Ostep 1 occurs first step 2 occurs first step 3 occurs first step 4 occurs first Ostep 5 occurs firstarrow_forward
- Which of the following is true about the conduction of action potentials? a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.arrow_forwardIdentify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B). a. _____ The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions. b. _____ Transmission is unidirectional and delayed. c. _____ A presynaptic neuron and a postsynaptic neuron are involved. d. _____ The use of neurotransmitters packaged into synaptic vesicles is required. e. _____ Transmission is nearly instantaneous and bidirectionarrow_forwardDiisopropyl fluorophosphate is an insecticide that works by binding with cholinesterase enzyme. Which of the following statements does NOT describe the function of diisopropyl fluorophosphate correctly? a. It blocks the acetylcholine receptor in the postsynaptic membrane. b. It causes acetylcholine to continuously contract the diaphragm or heart muscle, which leads to death. c. It causes muscle fatigue and paralysis to occur as muscle contraction cannot be suppressed. d. It causes acetylcholine to accumulate in the synapse.arrow_forward
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