Top 150+ Solved Nervous System MCQ Questions Answer
Q. Which nerves have the biggest diameter and faster conduction velocity?
a. group A alpha
b. group A beta
c. group A gamma
d. group A delta
e. group C
Q. In excitation-contraction of skeletal muscle, calcium binds to:
a. tropomyosin
b. myosin
c. troponin I
d. troponin C
e. troponin T
Q. Myosin binding sites on actin are normally covered by:
a. troponin I
b. troponin C
c. troponin T
d. tropomyosin
e. ryanodine molecule
Q. With regard to skeletal muscle, which is INCORRECT?
a. the terminal cisterns of sarcoplasmic reticulum lie in contact with T tubules
b. the T tubules surround the muscle at its Z lines
c. the Z line lies within the I band
d. the M line is due to a central bulge in each of the thick filaments
e. the area between two adjacent Z lines is called a sarcomere
Q. Noradrenaline:
a. is the main neurotransmitter of the parasympathetic nervous system
b. acts as sympathetic neuromuscular junctions in skeletal muscle and vascular smooth muscle
c. is secreted by the adrenal medulla
d. causes pupillary constriction
e. reduces blood pressure
Q. Acetylcholine:
a. is a major neurotransmitter in the spinal cord
b. is degraded within the neuromuscular end-plate by dehydration
c. is important in the stimulation of pancreatic function
d. is the neurotransmitter involved in vagal stimulation of the heart
e. is antagonised by neostigmine
Q. The functions of tropomyosin in skeletal muscle include:
a. releasing Ca2+ after an action potential
b. sliding on actin to produce shortening
c. binding to myosin during contraction
d. acting as a “releasing protein” at rest by covering up the sites where myosin binds to actin
e. generating ATP which passes to the contractile mechanism
Q. Membrane potential:
a. is only found in nervous tissue
b. is not contributed to by the Na+ /K+ pump
c. magnitude does not change from tissue to tissue
d. is negative inside in relation to the outside
e. is mainly caused by leaking Na+ / K+ channels
Q. Gamma amino butyric acid:
a. is an excitatory mediator in the brain
b. is formed by decarboxylation of glutamate
c. acts at three different classes of GABA receptors
d. is mostly secreted unchanged in the urine
e. is the main mediator in glutamate
Q. Opioid peptides:
a. are not formed from precursors
b. include morphine as an example
c. form the opioid receptors in the brain
d. are mainly found in the brain and gastrointestinal tract
e. are almost always excreted unchanged
Q. Regarding the autonomic nervous system:
a. does not have a reflex arc like somatic nervous system
b. has dopamine as the main transmitter
c. has cholinergic division which increases activity of the intestinal musculature and increases gastric secretion
d. neurotransmitter noradrenaline is metabolised by pseudocholinesterase
e. is not involved with visceral sensation
Q. Contraction of skeletal muscle is initiated by Ca++ binding to:
a. tropomyosin
b. myosin
c. actin
d. troponin C
e. troponin I
Q. The stretch reflex in skeletal muscle:
a. is a feedback reflex aimed at maintaining muscle length
b. is a polysynaptic reflex
c. maintains muscle strength at various levels of muscle strength
d. is not elicited in the knee jerk which occurs after tapping
e. none of the above are true
Q. Excitary amino acids in the brain are:
a. glutamate and GABA
b. GABA and glycine
c. glutamate and glycine
d. glycine and aspartate
e. glutamate and aspartate
Q. With regard to contraction and relaxation of skeletal muscle, all of the following aretrue EXCEPT:
a. contraction involves the release of K+ from the terminal cisterns
b. relaxation involves the release of Ca2+ from troponin
c. prior to contraction, increase Na+ and K+ conduction occurs in the end-plate membrane
d. relaxation involves cessation of the interaction between actin and myosin
e. contraction involves inward spread of depolarisation along T tubules