Bioelectric Phenomena Practice Questions

Question 1

Sequence the events in neuromuscular action potential conduction:
1. Sodium channels open in the end plate
2. Calcium enters at the nerve terminal
3. Release of acetylcholine

Accepted Answer

$2 \rightarrow 3 \rightarrow 1$

Answer

$1 \rightarrow 2 \rightarrow 3$

Answer

$1 \rightarrow 3 \rightarrow 2$

Answer

$3 \rightarrow 2 \rightarrow 1$

Question 2

Hyperpolarization is caused by which ions?

Accepted Answer

K+

Answer

Na+

Answer

HCO3-

Answer

Ca2+

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

Absolute refractoriness of a neuron is due to?

Accepted Answer

Inactivation of Na channels

Answer

Hyperpolarization of Cl channels

Answer

Opening of rectifier K+ channels

Answer

Closure of activated Na channels

Question 5

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 6

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 7

Identify the modality of intercellular communication shown below.

Accepted Answer

Paracrine

Answer

Autocrine

Answer

Synaptic

Answer

Gap junction

Question 8

Berger waves (alpha waves) of EEG have a rhythm of how many Hz?

Accepted Answer

8-13 Hz

Answer

0-4 Hz

Answer

4-7 Hz

Answer

13-30 Hz

Question 9

Type I muscle fibers are rich in myosin heavy chain. What is their characteristic property?

Accepted Answer

Slow contracting, resistant to fatigue

Answer

Fast contracting, susceptible to fatigue

Answer

Slow contracting, susceptible to fatigue

Answer

Fast contracting, resistant to fatigue

Question 10

What is the primary function of cyclic AMP (cAMP)?

Accepted Answer

Activation of protein kinase

Answer

Ion exchange

Answer

Activation of Ryanodine receptors

Answer

Release of acetylcholine

Bioelectric Phenomena — MCQs

Bioelectric Phenomena — MCQs

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