Muscles And Neuromusclar Junction MCQs

Option A: Propagation

Option B: All or none law

Option C: Depolarization

Option D: Hyper polarization

Correct Answer: Depolarization ✔

Option A: Cell

Option B: Plasma

Option C: Interstitium

Option D: Bone

Correct Answer: Cell ✔

Option A: Na effux

Option B: Na influx

Option C: K efflux

Option D: K influx

Correct Answer: K efflux ✔

Option A: Cylindrical

Option B: Transverse striation

Option C: Centrally placed nuclei

Option D: Multiple nuclei

Correct Answer: Centrally placed nuclei ✔

Option A: Failure of acetylcholine to diffuse

Option B: Failure of ATP supply

Option C: Failure of break down of calcium bridges

Option D: None of the above

Correct Answer: Failure of ATP supply ✔

Option A: Is not essential for contraction to occur

Option B: Has a prolonged plateau phase?

Option C: Spreads in ward to all parts of the muscle via the t- tubule system

Option D: Begins with an, in ward movement of K+ ins

Correct Answer: Spreads in ward to all parts of the muscle via the t- tubule system ✔

Option A: To study muscle activity

Option B: Determine class II malocclusion

Option C: Determine the centric relation

Option D: Determine the centric occlusion

Correct Answer: To study muscle activity ✔

Option A: Contracts when calcium is taken up by sarcoplasmic reticulum

Option B: Contracts when actin and myosin filaments shorten

Option C: Contraction is initiated by calcium binding to troponin

Option D: Contraction is initiated by calcium binding to tropomyosin

Correct Answer: Contraction is initiated by calcium binding to troponin ✔

Option A: Sarcolemma

Option B: Sarcoplasm

Option C: Myofibril

Option D: Endomysium

Correct Answer: Myofibril ✔

Option A: Contraction of skeletal muscle

Option B: Decrease of heart rate

Option C: Secretion of saliva

Option D: Contraction of pupils

Correct Answer: Contraction of skeletal muscle ✔

Option A: Troponin

Option B: Myosin

Option C: Actin

Option D: Protein- C

Correct Answer: Troponin ✔

Option A: Contracts when calcium is taken up by sarcoplasmic reticulum

Option B: Contracts when actin and myosin filaments shorten

Option C: Contraction is initiated by calcium binding to troponin

Option D: Contraction is initiated by calcium binding to tropomyosin

Correct Answer: Contraction is initiated by calcium binding to troponin ✔

Option A: Extracellular Ca+2

Option B: Sarcoplasmic ca+2

Option C: Extracellular Na+

Option D: Intracellular Na+

Correct Answer: Extracellular Ca+2 ✔

Option A: Inhibitory post synaptic potential

Option B: Miniature end plate potential

Option C: Action potential

Option D: End plate potential

Correct Answer: Miniature end plate potential ✔

Option A: Net current in an outward direction

Option B: Cell interior becomes more negative

Option C: Cell interior becomes less negative

Option D: None of the above

Correct Answer: Cell interior becomes less negative ✔

Option A: Skeletal and cardiac

Option B: Smooth and cardiac

Option C: Smooth and skeletal

Option D: All of the above

Correct Answer: All of the above ✔

Option A: white and brown

Option B: White and yellow

Option C: White and gray

Option D: White and red

Correct Answer: White and red ✔

Option A: Insufficient neurotransmitter

Option B: Depletion of intracellular Na+

Option C: Inactivation of Na+ k+ ATPase

Option D: Voltage inactivation of the Na+ channel

Correct Answer: Voltage inactivation of the Na+ channel ✔

Option A: Adaptation

Option B: Accommodation

Option C: Refractoriness

Option D: Electrotonus

Correct Answer: Accommodation ✔

Option A: Laryngeal muscles

Option B: Pharyngeal muscles

Option C: Muscles of middle ear

Option D: Extraocular muscles

Correct Answer: Laryngeal muscles ✔

Option A: Inhibiting cholinesterase

Option B: Inhibiting the CNS

Option C: Depolarizing the motor end plate of skeletal muscle

Option D: Blocking the release of acetyl choline at the end plate

Correct Answer: Depolarizing the motor end plate of skeletal muscle ✔

Option A: Pumps Na against a gradient

Option B: 5 Na+ exchanged for 2K+

Option C: Increase in intracellular Na

Option D: Hypocalcemia inhibits the pump

Correct Answer: 5 Na+ exchanged for 2K+ ✔

Option A: A flexor muscle and an extensor muscle

Option B: A single skeletal muscle and all the motor peurons that supply it

Option C: A single motor neuron and all the muscle fibers it innervates

Option D: All the motor neurons in which response are observed after maximal stimulation of a single sensory nerve

Correct Answer: A single motor neuron and all the muscle fibers it innervates ✔

Option A: Dopamine

Option B: Epinephrine

Option C: Nor epinephrine

Option D: Acetylcholine

Correct Answer: Acetylcholine ✔

Option A: there is lack of acetyl choline

Option B: Lack of acetyl choline receptors

Option C: There is isometric contraction

Option D: Muscles are rigid and tough

Correct Answer: Lack of acetyl choline receptors ✔

Option A: Tomes fibers

Option B: Interstitial fibers

Option C: Sharpey’s fibers

Option D: Haversian fibers

Correct Answer: C. Sharpey’s fibers ✔

Option A: The muscle moves a load through a distance

Option B: The muscle is not able to move the load

Option C: The latent period of contraction is shorter than isometric contraction

Option D: The length of muscle is increased

Correct Answer: The muscle moves a load through a distance ✔

Option A: EEG

Option B: EMG

Option C: Venn diagram

Option D: ECG

Correct Answer: EMG ✔

Option A: Surface electrode

Option B: Round electrode

Option C: Hook electrode

Option D: Needle electrode

Correct Answer: Surface electrode ✔

Option A: H band

Option B: Sarcoplasm

Option C: Sarcomere

Option D: A line

Correct Answer: Sarcomere ✔

Option A: Actin

Option B: Myosin

Option C: Troponin

Option D: Tropomyosin

Correct Answer: Troponin ✔