Concept explainers
Introduction:
Synapses are the connecting zone or the junctional region between two nerve cells. These regions help in the conduction of the nerve impulses from one neuron to the axon. A synaptic region is generally located between the axon of one neuron and the dendrites of the subsequent one.
Answer to Problem 1DYKB
Correct answer:
The correct answer is option (a) they release neurotransmitters into the synaptic cleft.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a) the axon terminals (of nerve cells) have round knob-like structures called synaptic knobs. These contain secretory vesicles (synaptic vesicles) that release NTs into the synaptic cleft. These NTs are needed for the transmission of nerve impulses from one neuron to another.
Explanation for incorrect answer:
Option (b) The synaptic knobs possess synaptic vesicles. These vesicles transmit the NTs into the subsequent neuron and not back to the synaptic knob. Hence, this is an incorrect option.
Option (c) They conduct graded potentials (action potentials) to the next neuron. Hence, this is an incorrect option.
Option (d) They are located in the axon terminals of a neuron. They conduct nerve impulses to the dendrites of the next one. Hence, this is an incorrect option.
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Chapter 12 Solutions
ANATOMY+PHYSIOLOGY
- When action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.arrow_forwardA(n)______neuron has one axon and one____ dendrite extending directly from the cell body. unipolar bipolar multipolar pseudounipolararrow_forwardA neuron responds to adequate stimulation with _______, a type of self-propagating signal.arrow_forward
- A neuron receiving a large enough signal, a resting potential changes and produces electrical impulse called ___________.arrow_forwardThe neuron cell is made up of which of the following parts? Axon Dendrite Soma All of the abovearrow_forwardOn what part of the neuron are NT receptors typically located? If the activated NT receptors cause channels to open or change thus changing the diffusion of ions, what type of potential will this initially produce? A.Resting B.Graded C.Action D.Homeostaticarrow_forward
- Which part of a neuron contains the nucleus?a. dendriteb. somac. axond. synaptic end bulbarrow_forwardWhen a neuron fires an action potential, the information travels through the axon,the dendrites, and the cell body, but not in that order. Place these three structures in the correct order.arrow_forwardThe axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential? A. Na+ channels close in a voltage-dependent manner B. Na+ channels close in a time-dependent manner C. Na+ channels close in a chemically-dependent manner D. Na+ channels open in a voltage-dependent mannerarrow_forward
- What events in a neuron membrane occur slowly when threshold potential is reached? Opening of K+ channel activation gate Closing of Na+ channel inactivation gate Opening of the Na+ voltage-gated channel activation gate Closing of Cl- voltage gated channels Closing of K+ inactivation gate (More than one answer may be correct, please help in answering)arrow_forwardWhich of the following neuron structure - function parings is incorrect? Axon - extension of cell body Dendrite - sensitive to chemical and electrical signals Cell body - contains cell nucleus Axon - transmits signals to neighboring cells Dendrite - unbranched receptor sites of signals from other neuronsarrow_forwardWhen they are not being stimulated, neurons have an electrical charge across their membranes called the resting potential. This potential is______ charged inside. When a neuron receives a sufficiently large stimulus, and reaches a potential called the_______ , it produces an action potential. This causes the neuron to become_____ charged inside.arrow_forward
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