Chemical synapses in the nervous system :-a- allow diffusion of chemical substances form the presynaptic neuron into the postsynaptic neuronb- allow transmission of potential changes in one direction only; from the presynaptic to the postsynaptic neuronsc- have potential-gated ionic channelsd- are more numerous in the peripheral nervous system than the central nervous system

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: When EPSP and IPSP occur simultaneously the postsynaptic membrane :-a- becomes depolarizedb- becomes…

A: EPSP refers to Excitatory Postsynaptic Potentials and IPSP refers to Inhibitory Postsynaptic…

Q: An undisclosed drug (Drug A) is a drug that can block voltage-gated K+ channels when being…

A: Snake venoms that are neurotoxic mainly impact the neuromuscular junction, disrupting…

Q: Neuropeptides :-a- are synthesized in the synaptic knobsb- consist of small moleculesc- interact…

A: Neuropeptides are protein molecules released by neurons that helps them communicate with each other.…

Q: Which of the following statements best describes the features of voltage-gated K+ channels?…

A: Voltage-gated potassium (K+) channels are ion channels that help regulate the membrane potential of…

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: Synaptic transmission depends upon :- a-direct transmission of impulses from the presynaptic neuron…

A: Nerve cell consists of a dendrite which are branched extentions that help in receiving the stimulus.…

Q: This type of signal involves the movement of ions across the plasma membranes: graded potentials…

A: Cell connections link directly to the cytoplasm of neighboring cells. When cytosolic chemicals can…

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: Which of the following statements about voltage gated channels is true? Voltage-gated…

A: The action potential generates when a rapid rise and a subsequent fall in membrane potential occurs…

Q: In the autonomic nervous system, the lower motor neurons directly innervate effector organs.…

A: The correct statement is:The lower motor neurons directly innervate effector organs.

Q: What is the difference between an action potential and a synapse? (select all that apply)

A: A characteristic pattern of quick rise and subsequent fall in voltage or membrane potential across a…

Q: In an experiment, the extracellular [Na+] surrounding a nerve cell was reduced from 145 to 45 mM.…

A: In the presence and absence of an impulse, the nerve cells exist in two states known as action…

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: Post-tetanic Potentiation in synapses :-a- is due to increased Ca ++ concentration in postsynaptic…

A: Nerve cells form the functional unit of the nervous system and play an essential role in…

Q: Which of the following statements are true with regards to the differences between a neuromuscular…

A: The following statements are true with regards to the differences between a neuromuscular junction…

Q: f a post synaptic neuron is stimulated to threshold by spatial summation this implies that the post…

A: The nervous system is composed of millions of nerve cells called neurons. Synapses are junctions…

Q: Synaptic delay :-a- is the time needed for release of neurotransmitter from synaptic vesiclesb- the…

A: Synapses is the junction where two neurons communicate with each other. This structure permits  a…

Q: When a postsynaptic neuron is adequately stimulated, action potentials develop at the initial…

A: A neuron is a basic functional unit of the nervous system. It is a complex network of specialized…

Q: Given the steps shown below, which of the following is the correct sequence for transmission at a…

A: Synaptic transmission is the process by which a signal travels through neurons. It involves the…

Q: What would happen to the resting membrane potential of a neuron if sodium (Na+ ) channels were…

A: Introduction:- Because Na +  is normally present at a much higher concentration outside of a cell…

Q: Choose all that apply [Na*] [K'] TThis diagram is a drawing of normal conditions that occur in a…

A: Neurons are the electrically excitable cells that make up the nervous system and the brain. They…

Q: IPSP differs from EPSP in :-a- being of shorter durationb- being unable o summate spatiallyc- moving…

A: Signal conducted at the synaptic terminal of neuron (presynaptic neuron) connected to the dendrites…

Q: A neuron has a resting membrane potential of -70 milivolts (mV) and a threshold value of -55 mV.…

A: Action potentials are the signals propagated through neurons in the form of electric impulse . These…

Q: Synaptic fatigue is due to : -a- decreased synthesis of neurotransmittersb- inability to release…

A: A synapse is a site between an effector organ and neuron or between two neurons. A neuron is the…

Q: When opened, the ligand-gated cation channels do not allow diffusion of Cl-because :-a- the size of…

A: Cells communicate each other by a process known as cell signaling. A ligand molecule binds with the…

Q: Synaptic cleft :-a- is the space between two synapses on the surface of neuronsb- allow diffusion of…

A: When an action potential reaches the terminus of an axon, it is transmitted from one neuron to…

Q: Action potentials propagate in one direction because of: O K* voltage-gated Channels become inactive…

A: The neurons send signals over long distances by generating and propagating action potentials over…

Q: Opening of ligand-gated Cl- channels causes :-a- inhibition of the postsynaptic neuronb-…

A: Ligand gated ion channels open in response to specific ligand molecules binding to the extracellular…

Q: In chemical synapses, transmission occurs in a forward direction     because :-a- neurotransmitter…

A: The junction between the two neurons is known as synapse. For signal transmission in the CNS of…

Q: "The local anesthetic, novacaine, used by most dentists blocks voltage-gated Na+ channels. Why would…

A: Thank you for the question : Answer : The effect of the local anesthetic novacaine blocks voltage…

Q: Which of the following is TRUE of resting membrane potential? why?   -is the period after an…

A: A resting potential consist of a neuron that is at rest, or the one which is not stimulated. It is…

Q: Synaptic knobs :-a- synthesize different types of neurotransmittersb- release neurotransmitters by…

A: The correct choice is C.

Q: Long-term potentiation of synaptic transmission :-a- is involved in pain control systemb- is caused…

A: The nervous system is one of the vital systems of a body. It is a system of nerves which carry…

Q: Put the following steps that occur at the synapse during information transfer between neurons in…

A: Synapse is basically a meeting point between the two neuron which chiefly concerned with passage of…

Q: The giant axon of the squid (Figure Q11–3) occu-pies a unique position in the history of our…

A: The Nernst equation for univalent ions at 20 degree celsius is : V=58mV x log c0/ci  in which c0 is…