Sympathetic nervous system induces
Heartbeat
Secretion of digestive juice
Secretion of saliva
All of the above
A.
Heartbeat
Medulla of brain has two regions affecting heart rate.
(i) Cardiac inhibitory centre.
(ii) Cardiac accelerator centre
Sensory nerves originating from the accelerator centre run parallel to the spinal cord and enter the sino-artial node. Stimulation by these nerves, which are the part of the sympathetic nervous system causes an increase in heartbeat.
If the threshold for hearing increasing 1000 times, the hearing loss is
40 decibels
50 decibels
60 decibels
None of these
Which cranial nerve has the highest number of branches?
Facial nerve
Trigeminal
Vagus nerve
None of these
The junction between the axon of one neuron and the dendrite of the next is called
Junction point
A synapse
A joint
Constant bridge
'Adaptation' of eyes in dark is due to
depletionof vision pigment in rods
depletion of vision pigment in cones
repletion of vision pigment in rods
repletion of vision pigment in cones
Which of the following is important for muscle contraction and nerve impulse transmission?
Ca2+ ions
Ca2+ and Mg2+ ions
Mg2+ ions
Fe2+ ions
In parasympathetic nervous system, which of the following is released?
Epinephrine
Norepinephrine
Serotonin
Acetylcholine
