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Vagal stimulation causes
A Fall in blood pressure
B Decreased cardiac output
C Constriction of pupil
D Relaxation of bronchial smooth muscles
E Decreased intestinal secretion
Stimulation of vagus nerve causes
A Reduction of the strength of ventricular contraction
B Secretion and vasodilatation in the salivary gland
C Mucous secretion from bronchial mucosal ceil
D The gall bladder to contract
E The spleen to contract
The net effects of stimulation of baroreceptors are
A Venodilation of peripheral circulatory system
B To decrease heart rate
C To decrease arterial blood pressure
D Venodilation of pulmonary vessels
E To increase force of contraction of cardiac muscle
Duration of inspiration is decreased and rate of ventilation is increased due to stimulation of
A Pneumotaxic center
B Apneustic center
C Vagus nerve
D Nucleus of tractus solitarius
E Ventral respiratory group
The postsynaptic neuron becomes fatigued after repeatative stimulation of an excitatory synapse at a rapid rate. This is due to
A Exhaustion of neurotransmitter store in presynaptic terminal
B Progressive inactivation of many postsynaptic receptors
C Slow development of abnormal concentration of ions in postsynaptic neurons
D Decrement of number of calcium channels of presynaptic terminal
E Increment of cholinesterase in synaptic cleft
Stimulation of the sympathetic part of the autonomic nervous system is responsible for
A Constriction of the pylorus
B Secretion of the sweat glands
C Contraction of the smooth muscles of the male genital tract
D Emptying of the urinary bladder
E Contraction of the bronchial smooth muscles
Sympathetic vasoconstrictor tone decreases due to increased stimulation of
A Aortic arch baroreceptors
B Carotid sinus receptors
C Pain nerve endings
D Carotid body receptors
E Aortic body receptors
Cells that undergo hyperplasia on stimulation are
A Hepatocytes
B Uterine smooth muscle cells
C Thyroid follicular cells
D Cardiac myocytes
E Neurons
The following anaesthetic agents cause direct sympathetic stimulation
A Ketamine
B Seroflurane
C Desflurane
D Halothane
E Isoflurane
Receptor potential
A Acts as electrical stimulus for generation of action potential
B Can be generated as a result of altered ionic flow across receptor membrane can
C Is not a graded potential
D Can be propagated along nerve fiber
E Can be abolished

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