WorksheetsNeurotransmitters and Muscle Physiology Quiz
Total questions: 20
Worksheet time: 10mins
What is the neurotransmitter released at the neuromuscular junction?
Dopamine
Acetylcholine
Norepinephrine
GABA
Which ion is essential for release of neurotransmitter at NMJ?
Sodium
Potassium
Calcium
Chloride
Which enzyme breaks down acetylcholine in the synaptic cleft?
Choline acetyltransferase
Acetylcholinesterase
Monoamine oxidase
Tyrosine hydroxylase
Myasthenia gravis is caused by antibodies against?
Voltage-gated calcium channels
Muscle actin
Acetylcholine receptors
Dopamine receptors
Which drug is used to diagnose myasthenia gravis?
Physostigmine
Edrophonium
Atropine
Neostigmine
Which type of muscle shows plateau phase in action potential?
Skeletal muscle
Cardiac muscle
Smooth muscle
All of the above
Motor unit is defined as?
Motor neuron + sensory neuron
Sensory neuron + muscle fibers
Single motor neuron + all muscle fibers it innervates
All muscle fibers in one muscle
Rigor mortis occurs due to depletion of which substance?
Calcium
ATP
Sodium
Potassium
Which protein masks the myosin binding site on actin in resting muscle?
Tropomyosin
Actin
Troponin
Myosin
Which type of muscle contraction occurs without change in length?
Isometric
Isotonic
Isokinetic
Concentric
Troponin complex is present in?
Skeletal muscle only
Cardiac muscle only
Smooth muscle only
Skeletal and cardiac muscle
Which ion binds to troponin to initiate muscle contraction?
Magnesium
Potassium
Calcium
Sodium
In skeletal muscle, calcium is released from?
Mitochondria
Sarcolemma
Nucleus
Sarcoplasmic reticulum
End plate potential is a type of?
Action potential
Graded potential
Resting potential
Hyperpolarization
Resting membrane potential of skeletal muscle is approximately?
-40 mV
-55 mV
-70 mV
-90 mV
Muscle tone is mainly maintained by?
Cerebellum
Alpha motor neurons
Gamma motor neurons
Motor cortex
Which is not a feature of smooth muscle?
Spindle-shaped cells
Presence of sarcomere
Involuntary control
Single nucleus per cell
Which receptor is involved in excitation-contraction coupling in skeletal muscle?
Nicotinic receptor
Ryanodine receptor
Muscarinic receptor
DHP receptor
T-tubules are best developed in which type of muscle?
Smooth muscle
Skeletal muscle
Cardiac muscle
All equally
Which of the following is a depolarizing neuromuscular blocker?
Atracurium
Succinylcholine
Curare
Neostigmine
