Pre-Lab Exercise 14-6 Branches of the Autonomic Nervous System system (SNS), ol

Question

Pre-Lab Exercise 14-6 Branches of the Autonomic Nervous System system (SNS), ol the syral est and The autonoenic nervous system (ANS) has two subdivisions: (a) the sympathetic nervous and (bi the parasympathetic nervous system (PSNS). Fill in Table 14.3 with the general characte of each branch of the ANS and the effects of each system on its target organs, using your n Exercise 14-4 (p. 381) in this unit for reference text and 14.3 and Parasympathetic Nervous Systems E PSNS Main function Location of nerve roots Neurotransmitterfs) Effects on Target Organs and Physiological Processes Heart Bronchioles (airway passages of the lungs) Blood vessels to abdominal organs and skin Blood vessels to skeletal muscle Secretion from digestive glands Urine formation/ Micturition (urination) upils of the eye 6 Exploring Anatomy & Physiology in the Laboratory

Explanation / Answer

Characteristic SNS PSNS Main function stimultes activities that are performed during emergency and stress situations stimulates activities that conserv and restorebody resources Location of the nerve roots originates in the spinal cord between the spinal segments T1-L2 It leave the CNS through cranial nerves 3,7,9 & 10 and through S2,S3 and S4 Neurotransmitter acetylecholine( in post ganglionic and preganglionic neurons supplying sweat gland, blood vessels and erector pili) and nor-adrenaline (in all preganglionic neurons except those supplying sweat gland, blood vessel and erector pili) Acetylecholine (in both preganglionic and post ganglionic neurons) Effect on target organ and physiological processes - - Heart Rate, contractility, cardiac output are increases Rate, contractility, cardiac output decreases Bronchioles Dilatation contraction Blood vessels to the abdominal organs and skin vasoconstriction no major action Blood vessels to skeletal muscle vasodilatation no major action Secretions from digestive glands Decrease or inhibits secretions Stimulates secretions Urine formation/micturition contracts internal sphincters, causing retention of urine Relaxes internal sphincters, resulting in passage of urine Pupils of the eye Pupillary Dilatation Pupillary contraction

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