The main types of muscle cells are______________?
A. Skeletal and cardiac
B. Smooth and cardiac
C. Smooth and skeletal
D. All of the above
Physiology Mcqs
Two major types of muscle fibres are found in humans_____________?
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
The absolute refractory period of an action potential is due to _______________?
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
Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?
Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?
A. Adaptation
B. Accommodation
C. Refractoriness
D. Electrotonus
The number of muscle fibers in a motor unit are least in______________?
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
Succinyl choline acts to block neuromuscular transmission by_______________?
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
Non true regarding Na/K pump is______________?
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
A motor unit is made up of______________?
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
The neuromuscular transmitter released at neuromuscular junction is_______________?
The neuromuscular transmitter released at neuromuscular junction is_______________?
A. Dopamine
B. Eephrine
C. Nor eephrine
D. Acetylcholine
In myasthenia gravis_______________?
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