Which ion channel is responsible for the release of neurotransmitters from the presynaptic neuron? Voltage-gated Cl- channels Stress-activated cation channels Leaky K+ channels Voltage-gated Ca+2 channels Voltage-gated Na+ channels

Q: Each of the following contributes to the unidirectional propagation of nerve signals EXCEPT_ A)…

A: If too many mistake are introduced in the chromosomes during DNA replication, the cell will not…

Q: Which of the following describes a threshold potential?   A brief reversal of the charge difference…

A: Answer. All cells have an electrical potential difference, or membrane potential, across the plasma…

Q: The refractory period goes from "absolute" to "relative" when:   The inactivation gate of Na+…

A: Introduction: When the stimulus strength reaches at least reach the strength of threshold, there is…

Q: IPSP could result from :-a- opening of K + channelsb- opening of ligand-gated cation channelsc-…

A: The postsynaptic membrane is the membrane, which receives a signal from the presynaptic cell and…

Q: Postsynaptic receptors include all the following types, except :-a- G-protein coupled receptorsb-…

A: Metabotropic receptors are also referred to as G protein linked receptors or G protein coupled…

Q: Which of the following statements is not true about neurons?   When there is no active nerve…

A: Neurons, specialized cells within the nervous system, play a vital role in transmitting electrical…

Q: Which of the following statements best describes the properties of a myelinated axons?     The…

A: Axons are surrounded by a multilayered protein and lipid covering, called the myelin sheath. Such…

Q: The regulation of neurotransmitters DOES NOT include reuptake of the neurotransmission from the…

A: Introduction Neurotransmitters are the chemical substance which is released at the end of a nerve…

Q: A new drug opens calcium ion channels in the membrane of the postsynaptic neuron. Would this produce…

A: There are many different types of cells in the body which form various organs and organ systems. For…

Q: Which of the following does NOT contribute to the establishment or maintenance of the neuron resting…

A: Neuron or nerve cells are cells that act as messengers, they are able to undergo  electrical…

Q: Predatory cone snails are beautiful (picture below), but deadly - they release a cocktail of toxins…

A: The neurons have the capability of generation of action potential and also transferred this action…

Q: Immediately after an action potential has peaked, which of the following channels is most likely to…

A: Channels show passive transport. During passive transport, ions move from high concentration to low…

Q: Why doesn’t an action potential that is propagated down an axon go in the reverse direction

A: Introduction Neurons are the small cells or units which are responsible for conducting electrical…

Q: What membrane protein of the neuron is responsible for briefly increasing the Na+ permeability of…

A: Transporters refer to the membrane protein that transports the molecules and ions from outside of…

Q: What happens to Na+ when a neuron is stimulated on its dendrite? Why does the movement of Na+ raise…

A: When different ions cross the neuron membrane action potentials is  induced. A stimulus first…

Q: Which of the following ion channels are always sensitive to small changes in electric charge?…

A: Transport through the cell membrane is important for cells to supply nutrients, ions, and other…

Q: In an experiment, a freshly isolated neuron is placed in a bath that has been almost completely…

A: A neuron is a specialized type of cell found in the nervous system that transmits electrical signals…

Q: If depolarization occurs at the neuromuscular junction and threshold is met, then…

A: If depolarization occurs at the neuromuscular junction and threshold is met, then, the…

Q: Connexons of gap junctions in electric synapses :-a- are Ligand-gatedb- are voltage-gatedc- allow…

A: In vertebrates, Gap junction funnels are made of two hemi-channels known as connexons, one…

Q: Indicate which gate is responsible for halting the rising phase of the action potential.  1- Na+…

A: Action potentials are the electrical impulses that are responsible for transmitting information…

Q: When a neurotransmitter binds with receptors at the membrane, it may cause sodium channels to open.…

A: The endogenous chemicals which makes neurons to communicate with each other throughout the body are…

Q: Which of the following is a correct functional match for CGMP? A Opens calcium ion channels Smooth…

A: B-Smooth muscle relaxation cGMP is a typical controller of particle channel conductance,…

Q: After an action potential has been initiated, there are two processes that prevent the membrane from…

A: The generation of action potential is very much important characteristics in nerve cells that is…

Q: Which two ideas about ion channels of a neuron at its resting potential are true? O ion channels are…

A: The movement of ions across the plasma membrane is responsible for maintaining the resting potential…

Q: EPSP acilitates depolarization of postsynaptic mem ne by increasing the permeability of the membrane…

A: Answer.    The correct answer is option (d) An EPSP facilitate depolarization of the postsynaptic…

Q: Tetrodotoxin from pufferfish is a poison that blocks voltage-gated Na+ channels. Therefore it…

A: Tetrodotoxin (TTX) is a neurotoxin with high potency. Pufferfish, porcupinefish, ocean sunfish, and…

Q: Which of the following best describes saltatory conduction? A process in myelinated axons where the…

A: In contrast to the slow continuous process of depression extending down an unmyelinated axon,…

Q: Which mechanism consumes energy to move ions across the neuron cell membrane? sodium-potassium…

A: There are two types of transport mechanisms- active transport and passive transport. Active…

Q: Which ion channels are controlled by change in membrane potential?     Voltage-gated channels…

A: Membrane potential can be defined as the concentration of ions across the plasma membrane and their…

Q: What is responsible for action potentials propagating in one direction? The inactivation of voltage…

A: Action potential generates when the neurons want to pass the information along the body from its…

Q: After a neuron fires an action potential, the lon concentration gradients are disrupted, What…

A: The neurons are the nerve impulse generating and transmitting cells in the nervous system. It is…

Q: At which point in the graph do voltage-gated potassium channels open? (Base your answer to this…

A: The action potential refers to the sudden changes in the resting membrane potential of the neuron…

Q: When a neuron reaches threshold voltage, all voltage-gated channels are triggered to make…

A: Neurons are specialized cells that transmit information in the nervous system. When a neuron…

Q: The effect of the inhibitory neurotransmitter on the postsynaptic membrane is to   a. maintain the…

A: Depolarization of membrane potential excites the neurons. Depolarization refers to the change in…

Q: Which of the following is comparable to a negative feedback cycle? opening of voltage-gated Na*…

A: Negative feedback cycles are important mechanisms that help regulate biological processes. In…

Q: If the neuron is stimulated such that its membrane potential changes to 50 mV, what is the sign of…

A: The membrane potential is defined as the variance in electrical potential throughout the plasma…

Q: Aerobic, or low-intensity, muscle training eventually results in

A: Neurotransmitters are mainly referred to as the body’s chemical messengers. They are the particles…

Q: Based upon the changes in permeability seen in the trace below and your knowledge of ion…

A: This is the graph which shows how a stimulus can arouse an action potential from a resting membrane…

Q: Draw a presynaptic and postsynaptic neuron at to demonstrate the release and acceptance of a…

A: SNARE protein play important role in release of neurotransmitter from synaptic vesicles  as they…

Q: What is the role of calcium in neuronal communication at the axon terminal?  What would be prevented…

A: The transmission of nerve impulse from one neuron to the next neuron occurs at the axon terminal…

Q: The graph shows a tracing of membrane potential change during the course of an action potential in a…

A: :Both graded potential and action potential are able to generate membrane depolarizations of the…

Q: Which of the following situations O None of these result in exten O Compromising the inactivatio…

A: Normally, the cells maintain a negative charge compared to the exterior of the cell. This charge…

Q: ligand gated sodium channels Na+/K+ Atpase opening of sodium channels

A: Because of the high concentration of sodium ions towards the outside of the cell or in the ecf…

Q: Neurotransmitters, the chemicals used in signaling across synapses, can be either re-absorbed by the…

A: Neurotransmitters can serve as chemical messengers for ion channels, neurotransmitter mainly causes…

Q: Which ligand-gated channel directly allows for the passage of both sodium and potassium across the…

A: Ion channels are the membrane proteins that allows the passage or movements of ions across the cell…

Q: A number of peptide toxins from snails and spiders can inhibit (block) voltage-gated calcium…

A: The action potential is transmitted from one neuron to the next neuron at the synaptic terminals.…