First Year Experimental Physiology Quiz

They can be the result of electrical current applied through electrodes.

The stimulus artifact is a short period of irregular deflection of the CRO baseline caused by current leakage, indicating the moment the stimulus is applied.

The velocity is directly related to the sum of all the action potentials occurring in the individual neurons of the whole nerve.

<p>It reflects changes in ion conductances across the nerve fiber membrane.</p> Signup and view all the answers

<p>The latent period is an iso potential period following the stimulus artifact that represents the time taken for the impulse to travel from the stimulating electrodes to the recording electrodes.</p> Signup and view all the answers

<p>The conduction velocity of its action potential.</p> Signup and view all the answers

<p>The firing level is the membrane potential at which the rate of depolarization changes from slow to rapid, specifically at -55 mV in nerves.</p> Signup and view all the answers

<p>In myelinated axons, conduction velocity increases as the distance between nodes of Ranvier increases.</p> Signup and view all the answers

<p>The spike potential consists of a slow phase and a rapid phase that occurs after reaching the firing level.</p> Signup and view all the answers

<p>Repolarization includes a slow phase followed by after-hyperpolarization.</p> Signup and view all the answers

<p>-55 mv</p> Signup and view all the answers

<p>Spike potential consists of rapid depolarization and rapid repolarization.</p> Signup and view all the answers

<p>Saltatory conduction occurs along myelinated fibers, allowing impulses to jump between nodes of Ranvier.</p> Signup and view all the answers

<p>Nodes of Ranvier allow for high permeability to Na, facilitating the rapid propagation of nerve impulses.</p> Signup and view all the answers

<p>NCV is calculated using the formula: distance (in mm) / Δ latency (in msec).</p> Signup and view all the answers

<p>The active electrode is placed on the thenar eminence, and the reference electrode is on the distal phalanx of the thumb.</p> Signup and view all the answers

<p>Negative after potential (after depolarization) and positive after potential (hyperpolarization).</p> Signup and view all the answers

<p>A repolarization wave starts as the point soon repolarizes after the depolarization wave.</p> Signup and view all the answers

<p>A nerve is a collection of nerve cell axons outside the central nervous system.</p> Signup and view all the answers

<p>Nerve fibers are classified according to their conduction velocity.</p> Signup and view all the answers

<p>Nerve conduction velocity is measured by the time taken for an impulse to travel between two points along the nerve.</p> Signup and view all the answers

<p>The unit of measurement for nerve conduction velocity is meters per second (m/s).</p> Signup and view all the answers

<p>Instruments used include a Cathode Ray Oscilloscope (CRO), microelectrodes, and an amplifier.</p> Signup and view all the answers

<p>The stimulus artifact indicates the moment of application of the stimulus on the CRO screen.</p> Signup and view all the answers

<p>The latent period is the iso potential period following the stimulus artifact before potential changes appear.</p> Signup and view all the answers

<p>The stimulus artifact is caused by current leakage from the stimulating electrodes to the recording electrodes.</p> Signup and view all the answers

<p>The placement of two electrodes within the nerve trunk.</p> Signup and view all the answers

<p>$A$, $B$, and $C$.</p> Signup and view all the answers

<p>Into $Aa$, $Aβ$, $Ay$, and $Aδ$.</p> Signup and view all the answers

<p>Larger diameter fibers have greater conduction velocity.</p> Signup and view all the answers

<p>Demyelination of neurons.</p> Signup and view all the answers

<p>Group $A$.</p> Signup and view all the answers

<p>Weakness or tingling sensation in the legs.</p> Signup and view all the answers

<p>The median nerve becomes compressed at the wrist.</p> Signup and view all the answers

<p>Group $C$ fibers.</p> Signup and view all the answers

<p>A bulging or ruptured spinal disk.</p> Signup and view all the answers

<p>A nerve is a collection of nerve cell axons outside the central nervous system.</p> Signup and view all the answers

<p>The stimulus artifact indicates the point at which the stimulus is applied on the CRO screen.</p> Signup and view all the answers

<p>By measuring the latent period and knowing the distance between the electrodes.</p> Signup and view all the answers

<p>Nerve conduction velocity is measured in meters per second (m/s) or milliseconds (ms).</p> Signup and view all the answers

<p>A Cathode Ray Oscilloscope (CRO) is used to record electrical changes.</p> Signup and view all the answers

<p>The latent period represents the time taken for the impulse to travel from the stimulating electrodes to the recording electrodes.</p> Signup and view all the answers

<p>Microelectrodes are inserted into the nerve cells to record electrical impulses.</p> Signup and view all the answers

<p>Nerve fibers are classified according to their conduction velocity.</p> Signup and view all the answers