What is the function of the presynaptic "autoreceptors" in axon terminals? O a. To release substances into the blood O b. To detect transmitter concentrations in the cleft O c. To release neurotransmitters into extracellular fluid d. To release the neurotransmitter acetylcholine

Q: What ion enters a neuron causing depolarization of thecell membrane?a. sodiumb. chloridec.…

A: A neuron is also called as nerve cell. It is an electrically excitable cell that communicated with…

Q: What does a transporter protein do at a synapse? a. It carries neurotransmitter molecules from the…

A: A neurotransmitter does not stay at the postsynaptic membrane. If it stays, it continues to excite…

Q: Why can physostigmine, an AchE blocker, be used to treat myasthenia gravis? OA. Physostigmine blocks…

A: Myasthenia gravis is an autoimmune disorder. In this disorder there is muscle weakness due to…

Q: What happens to patients on Prozac, which blocks the serotonin transporter? A. Degradation of…

A: Fluoxetine, sold under the brand name of Prozac, which is an antidepressant of the selective…

Q: What distinguishes the ANS from the somatic motor system? a. The ANS excites its peripheral targets.…

A: The nervous system, along with the endocrine system, is involved in the regulation of body…

Q: When the neuron’s membrane is at rest, where are the sodium ions and potassium ions most…

A: Answer is b.) Sodium is mostly inside and potassium is mainly outside.

Q: What is the electrical current that travels along neurons called? A. Neurotransmitter B. Action…

A: For the functioning of the nervous system, sending and receiving signals by the neurons are…

Q: Where does saltatory conduction occur? Select one: a. From node to node in unmyelinated fibers b.…

A: saltatory conduction in normal term means propagation/movement of action potential from one node of…

Q: What chemical is released by the axon terminals of amotor neuron at a neuromuscular junction?a. ACh…

A: A chemical synapse formed between a muscle cell and a motor neuron where a motor neuron transmits…

Q: Oligodendrocytes and Schwann cells generate a fatty substance known as a. glial. c. myelin. b. soma.…

A: Oligodendrocytes and Schwann cells (or neurilemma cells) are the non-neuronal cells of the nervous…

Q: Which precedes an action potential traveling down the axon of a neuron? A. Neurotransmitters bind to…

A: The right Answer is A

Q: Which of the following is NOT an example of communication that happens from one neuron to another…

A: Answer: - Option a - Endocrine signalling (ex. hormones secreted into the bloodstream travel and…

Q: Damage to the axons in the spinal cord is typically permanent and debilitating. One promising avenue…

A: Neuroglial cells are nonexcitatory supporting cells that are present in both central(CNS) and…

Q: The drawing back in to the terminal button of neurotransmitter molecules after their release in to…

A: The microscopic gap present between terminal end of axon of one neurone and dendron or axon or cell…

Q: Where does collateral sprouting take place? a. In the cell body b. In the axon c. In the dendrites…

A: Collateral sprouting can be defined as the growth of intact axons into the neighbouring denervated…

Q: What is the conduction velocity of the action potentil in a myelinated axon of the nerve cell?

A: The conduction velocity is the speed in which electrochemical impulse propagates down a neural…

Q: Motor neurons and interneurons are neurons.a. pseudo-unipolar c. multipolarb. bipolar d. afferent

A: Since neurons relay signals between the brain and tissues and regulate their movement or behavior,…

Q: Small gaps in the myelin sheath where the axon is exposed to the extracellular environment are…

A: The structural and functional units of the nervous system which are capable of sending and receiving…

Q: What happens to the membrane potential of a neuron when an action potential is stimulated?   A.…

A: The generation of action potential occurs muscle and neural cells in case of a sudden variation in…

Q: What detects the increase of intracellular Ca2+ concentration when action potentials arrive at the…

A: Action potential is sudden , rapid change in the resting membrane potential across a cell membrane…

Q: Which receptor is an adrenergic receptor that results in broncodialation when activated by agonist?…

A: The human body contains different types of receptors, which are proteins found on the surface of…

Q: When the action potential begins, Na+ gates open, allowing Na+ to cross the membrane. The charge…

A: Membranes potential can be defined as the change in electric potential due to changes in the amount…

Q: Which statement about nicotinic acetylcholine receptors (nAChRs) is true? a. Each nAChR is composed…

A: Nicotinic acetylcholine receptors (nAChRs) are a type of ion channel receptor found in the nervous…

Q: When do neural discharges in the brain have their strongest effect? a. When the discharge rate of…

A: Introduction: The basic unit of communication in the nervous system is the nerve cell (neuron). Each…

Q: What guarantees that there are unidirectional action potential? A. threshold B. depolarization…

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

Q: What is the correct statement about the myelin sheath?   a It is produced by ependymal cells.   b…

A: Nerve is the part of nervous system. The nerve transmits the impulse from brain to body parts or…

Q: The fatty substance that helps protect the axon is calleda. neurotransmitter.b. myelin.c.…

A: Nervous system coordinates and controls the activities of the body. It is divided into two…

Q: The junction between the axon of one cell and the dendrite of another is calleda. neurilemma.b.…

A: Most neurons have a cell body, an axon many terminal branches called dendrites which are able to…

Q: Axons found around the area indicated by the arrow in the figure above are myelinated by A.…

A: Myelination is the process by which nerve fibers are insulated with a layer of myelin, a fatty…

Q: Excitatory postsynaptic (EPSP'S) the resting membrane potentials A. have little or no effect b…

A: A current generated in our body in the membranes of the neuron cells. It is due to voltage…

Q: What comes before the release of neurotransmitters at the synaptic cleft? 1. Neurotransmitters…

A: Synaptic transmission is a process whereby electrical impulse pass through a synapse with the…

Q: Mark the following statements as true of false. If a statement is false, correct it to make a true…

A: The nervous system acts through nerve impulses along the axons of the neurons and neurotransmitters…

Q: When a vigorous pinch excited a dog’s flexor muscle, it decreased excitation of the extensor muscles…

A: In animals and in humans, the muscular system is responsible for producing movement. This system is…

Q: Suppose you want to cause the presynaptic terminal of an axon to release its transmitter. How could…

A: Synapse was name given by Sherrington. Synapse is junction between two neurons where information is…

Q: Neurotransmitters must pass from an axon terminal to the next dendrite by crossing a fluid-filled…

A: Neurons facilitate communication in the brain. A neuron is made up of dendrites (receives…

Q: Predict what would happen if the calcium ion channels in the axon terminal were blocked   a. It…

A: The message is transmitted across the nervous system in the form of nerve impulse. The neurons are…