Medical MCQs

5099 MCQs  (Page 486 of 510)

First change to occur in the distal segment of cut________________?
A. Myelin degeneration
B. Axonal degeneration
C. Mitosis of schwann cell
D. Sprouting
Wallenberg degeneration is seen in______________?
A. Proximal cut end of nerve with cell body
B. Distal cut end of nerve without cell body
C. Both the free ends of the cut nerve
D. All are true
Respiratory center is situated in_______________?
A. Medulla oblongata
B. Spinal cord
C. Midbrain
D. Hypothalamus
Preganglionic parasympathetic fibers are_______________?
A. Somatic only
B. Parasympathetic
C. Sympathetic
D. Cholinergic
Sensations of pain from teeth and temperature are carried by_______________?
A. Corticospinal tract
B. Corticobulbar tract
C. Lateral spinothalamic tract
D. Ventral spinothalamic tract
Which of the following is not true for myelinated nerve fibers______________?
A. Impulse through myelinated fibers is slower than non- myelinated fibers
B. Membrane currents are generated at nodes of ranvier
C. Saltatory conduction of impulses is seen
D. Local anesthesia is effective only when the nerve is not covered by myelin sheath
Tremors are seen in disorder of_________________?
A. Basal ganglia
B. Pain pathway
C. Pyramidal tract
D. Parathyroid gland
2nd heart sound is characterized by all except______________?
A. Due to closure of semilunar valves
B. Is occasionally split
C. Has longer duration than 1st heart sound
D. Marks the onset of diastole