During a stressful situation, a person experiences increased heart rate, rapid breathing, and dilated pupils. Which neurotransmitter is PRIMARILY responsible for mediating these physiological responses?
Acetylcholine
Dopamine
Serotonin
Norepinephrine
Related Questions
For quick coordination, our neural system is organized through
Organ to organ connections
Cell to cell connections
Point to point connections
Point to cell connections
At the neuromuscular function
The muscle membrane possesses musculariae receptors
The motor nerve endings secrete norepinephrine
Curare leads to prolongation of neuromuscular transmission
The motor nerve endings secrete acetylcholine
Which of the following is incorrectly paired with its function?
Medulla oblongata—voluntary movements
Cerebellum—balance and coordination
Corpus callosum—communication between brain hemispheres
Hypothalamus—regulation of body temperature
Which part of brain controls intellectual ability?
Frontal lobe
Parietal lobe
Temporal lobe
Occipital lobe
Which of the following is not an organ of central nervous system?
Brain
Cranial nerves
Spinal cord
None of these
At the neuromuscular function
The muscle membrane possesses musculariae receptors
The motor nerve endings secrete norepinephrine
Curare leads to prolongation of neuromuscular transmission
The motor nerve endings secrete acetylcholine
Which statements are wrong?
I.Synaptic cleft of neurons secrete adrenaline.
II.Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
III.Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form myelin sheath.
IV.Spinal cord and cranial nerves are made of non-myelinated nerve fibres.
Of the four statements,
I, II are correct but III and IV are incorrect
I, II and III are correct but IV is incorrect
III and IV are correct but I and II are incorrect
II and III are correct but I and IV are incorrect
Which part of the brain is responsible for maintaining posture and balance?
Cerebrum
Medulla
Cerebellum
Thalamus
In the peripheral nervous system, the myelin sheath is produced by:
Oligodendrocytes
Astrocytes
Microglia
Schwann cells
In parasympathetic nervous system, which of following is released?
Epinephrine
Norepinephrine
Serotonin
Acetycholine
