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Medical Science Mcqs 5254 MCQs [All-Courses]

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Medical Science is the study of human health, diseases, prevention, and treatment, focusing on diagnosis, patient care, and medical research to improve healthcare outcomes.

All Topics  5254

The main types of muscle cells are______________?
A Skeletal and cardiac
B Smooth and cardiac
C Smooth and skeletal
D All of the above
Correct Answer: All of the above
Two major types of muscle fibres are found in humans_____________?
A white and brown
B White and yellow
C White and gray
D White and red
Correct Answer: White and red
The absolute refractory period of an action potential is due to _______________?
A Insufficient neurotransmitter
B Depletion of intracellular Na+
C Inactivation of Na+ k+ ATPase
D Voltage inactivation of the Na+ channel
Correct Answer: Voltage inactivation of the Na+ channel
Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?
A Adaptation
B Accommodation
C Refractoriness
D Electrotonus
Correct Answer: Accommodation
The number of muscle fibers in a motor unit are least in______________?
A Laryngeal muscles
B Pharyngeal muscles
C Muscles of middle ear
D Extraocular muscles
Correct Answer: Laryngeal muscles
Succinyl choline acts to block neuromuscular transmission by_______________?
A Inhibiting cholinesterase
B Inhibiting the CNS
C Depolarizing the motor end plate of skeletal muscle
D Blocking the release of acetyl choline at the end plate
Correct Answer: Depolarizing the motor end plate of skeletal muscle
Non true regarding Na/K pump is______________?
A Pumps Na against a gradient
B 5 Na+ exchanged for 2K+
C Increase in intracellular Na
D Hypocalcemia inhibits the pump
Correct Answer: 5 Na+ exchanged for 2K+
A motor unit is made up of______________?
A A flexor muscle and an extensor muscle
B A single skeletal muscle and all the motor peurons that supply it
C A single motor neuron and all the muscle fibers it innervates
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
The neuromuscular transmitter released at neuromuscular junction is_______________?
A Dopamine
B Epinephrine
C Nor epinephrine
D Acetylcholine
Correct Answer: Acetylcholine
In myasthenia gravis_______________?
A there is lack of acetyl choline
B Lack of acetyl choline receptors
C There is isometric contraction
D Muscles are rigid and tough
Correct Answer: Lack of acetyl choline receptors
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