Electrophysiological Measurements Practice Questions

Question 1

What is the primary cause of the plateau phase in the cardiac muscle action potential?

Accepted Answer

The calcium channels remaining open longer than the sodium channels

Answer

The movement of fewer sodium ions across the cell membrane

Answer

The increased membrane permeability to potassium ion

Answer

A decrease in the amount of calcium diffusing across the membrane

Question 2

Equilibrium potential of calcium is

Accepted Answer

+130mV

Answer

-32mV

Answer

+65mV

Answer

-95mV

Question 3

Which of the following statements about the Na-K pump is false?

Accepted Answer

It is located on the apical membrane of cell

Answer

It is not directly involved in the generation of action potentials.

Answer

It is electrogenic

Answer

It needs ATP for its functioning

Question 4

Assertion: RMP depends on proteins and phosphate ions.
Reason: Diffusion potential can be calculated using nernst equation.
Choose the best statement regarding the assertion and reason.

Accepted Answer

Both true, Reason is not the explanation of assertion

Answer

Assertion false, Reason true

Answer

Both true, Reason is the explanation of assertion

Answer

Assertion true, Reason false

Question 5

Hyperpolarization is caused by which ions?

Accepted Answer

K+

Answer

Na+

Answer

HCO3-

Answer

Ca2+

Question 6

Alpha wave on EEG represents -

Accepted Answer

Awake with eyes closed with mind wandering

Answer

Awake and fully alert

Answer

Awake with eyes open

Answer

Deep sleep

Question 7

Identify the modality of intercellular communication shown below.

Accepted Answer

Paracrine

Answer

Autocrine

Answer

Synaptic

Answer

Gap junction

Question 8

In multiple sclerosis, slow conduction of motor and sensory pathways is due to?

Accepted Answer

Loss of myelin sheath

Answer

Dysfunction of sodium channels

Answer

Dysfunction of calcium channels

Answer

Defect in the nodes of Ranvier

Question 9

Cranial nerve 8 palsy is associated with all of the following symptoms except:

Accepted Answer

Gag reflex

Answer

Hearing loss

Answer

Tinnitus

Answer

Vertigo

Question 10

Which of the following types of nerve fibers are primarily responsible for transmitting slow, dull, and chronic pain sensations?

Accepted Answer

C fibers

Answer

A-alpha fibers

Answer

A-beta fibers

Answer

A-delta fibers

Electrophysiological Measurements — MCQs

Electrophysiological Measurements — MCQs

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