A. there is lack of acetyl choline
B. Lack of acetyl choline receptors
C. There is isometric contraction
D. Muscles are rigid and tough
Related Mcqs:
- The beneficial effect of drug neostigmine in the treatment of Myasthenia gravis is due to the action____________?
A. It is produces more acetylcholine
B. It inhibits the action of cholinesterase
C. It produces more acetycholine receptors
D. It increases the action of cholinesterase - Calcium ions triggers muscle contraction by binding to ___________________?
A. Actin
B. Myosin
C. Troponin
D. Tropomyosin - The neuromuscular transmitter released at neuromuscular junction is_______________?
A. Dopamine
B. Epinephrine
C. Nor epinephrine
D. Acetylcholine - 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 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 - 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 - Which one of the following is a regulatory protein of the muscle ?
A. Troponin
B. Myosin
C. Actin
D. Protein- C - Which is caused by acetylcholine through nicotinic receptors_____________?
A. Contraction of skeletal muscle
B. Decrease of heart rate
C. Secretion of saliva
D. Contraction of pupils - Rigor mortis results after death is due to________________?
A. Failure of acetylcholine to diffuse
B. Failure of ATP supply
C. Failure of break down of calcium bridges
D. None of the above - All are features of skeletal muscle except______________?
A. Cylindrical
B. Transverse striation
C. Centrally placed nuclei
D. Multiple nuclei
