Explain functions parasympathetic nervous system
Answers
Answer:
The parasympathetic nervous system is one of three divisions of the autonomic nervous system.
Sometimes called the rest and digest system, the parasympathetic system conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract.
Explanation:
Functions:
Sensation
Vascular effects:
Heart rate is largely controlled by the heart's internal pacemaker activity. Considering a healthy heart, the main pacemaker is a collection of cells on the border of the atria and vena cava called the sinoatrial node. Heart cells exhibit automaticity which is the ability to generate electrical activity independent of external stimulation. As a result, the cells of the node spontaneously generate electrical activity that is subsequently conducted throughout the heart, resulting in a regular heart rate.
Receptors:
The parasympathetic nervous system uses chiefly acetylcholine (ACh) as its neurotransmitter, although peptides (such as cholecystokinin) can be used.[17][18] The ACh acts on two types of receptors, the muscarinic and nicotinic cholinergic receptors. Most transmissions occur in two stages: When stimulated, the preganglionic neuron releases ACh at the ganglion, which acts on nicotinic receptors of postganglionic neurons. The postganglionic neuron then releases ACh to stimulate the muscarinic receptors of the target organ.
Answer:
the function of parasympathetic nervous system is antagonistic i.e. the ANS acts as a supressing
agent in all cases except for the digestive system where it acts as an stimulator.
it's function can be varying like .. in some cases it does vasoconstriction while in the others it acts for checking the secretions of certain enzymes.
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