Autonomic Nervous System

Card Set Information

Author:
Bobopudge
ID:
57879
Filename:
Autonomic Nervous System
Updated:
2011-01-03 10:36:04
Tags:
NM ANS
Folders:

Description:
fungaa
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Bobopudge on FreezingBlue Flashcards. What would you like to do?


  1. Compare the somatic nervous system and ANS
    • Somatic:
    • Concious control of movement and posture
    • Voluntary
    • Affects localized areas
    • ANS:
    • Controls visceral functions
    • Involantary
    • Affects multiple systems
  2. Fill in the blanks:
    • Sympathetic preganglionic nerves are (short). Sympathetic postganglionic nerves are (long)
    • Sympathetic ganglia located in the (sympathetic trunk)
    • Parasympathetic preganglionic nerves are (long)
    • Parasympathetic postganglionic nerves are (short)
  3. Compare sympathetic nerves and parasympathetic nerve fibers
    • Sympathetic:
    • Long spread out postganglionic fibers
    • Many postganglionic fibers for each pre-ganglionic
    • Parasympathetic:
    • Short localized postganglionic fibers
    • Relatively few postganglionic fibers to each pre-ganglionic
  4. Discuss sympathetic nerves and parasympathetic nervous system
    • Parasympathetic:
    • Dominates during rest and digest
    • Promotes GI secretion and motility, urination, defecation
    • Sympathetic:
    • Dominates during emergency situations
    • Increases cardiac output, pulmonary ventilation, blood to muscles, blood glucose levels
    • Slows down digestion, kidney filtration, etc.
  5. Discuss autonomic neurotransmittors
    • Cholinergic neurons release: Ach, VIP
    • Noradreneric neurons release: NA, Neuropeptide Y, Adenosine
    • State the cotransmitter: VIP, NPY, Adenosine
    • State their function: potentiate action of principle NT
  6. Outline sympathetic stimulation of heart
    • Increase heart rate:
    • -- B1 receptors on SA nodes
    • -- Coupled to excitatory G-proteins
    • -- Increase of cAMP
    • -- Opening of Na and Ca channels
    • -- Speeds up rate of depolarization
    • -- Increases heart rate
    • Increase force of contraction
  7. Outline sympathetic control of blood vessels
    • Maintain sympathetic tone (basal level of vasoconstriction)
    • Gut and cutaneous blood vessels:
    • -- Contain a1 receptors
    • -- Sensitive to vasoconstriction
    • -- Diverts blood to other areas
    • Skeletal muscle blood vessels:
    • - Contain b2:
    • --- stimulated by moderate [adrenaline]
    • --- Vasodilate
    • --- In response to exercise
    • - Also contain a1:
    • --- High [adrenaline]
    • --- Vasoconstriction
    • --- In response to hemorrhage
  8. Outline the sympathetic control of:
    • Eyes:
    • -- a1 – contract dilator pulilae muscles (dilate eye)
    • -- b2 – relax ciliary muscles (far vision)
    • Airways:
    • -- B2 – bronchodilate
    • Gastrointestinal tract:
    • -- a2 on presynaptic cholinergic neurons – indirectly inhibit tone + motility + secretion
    • -- a1 – contract sphincters
    • Adrenal medulla:
    • -- muscurinic receptors – release Adrenaline into blood
    • Salivary glands:
    • -- B1- amylase secretion
    • Metabolism:
    • -- B2 – insulin secretion, glycogenolysis, gluconeogenesis
    • -- B1 – lipolysis
  9. Discuss horner’s syndrome
    • Damage to superior cervical ganglion
    • Symptoms: ptosis, miosis, anhydrosis, flushing of face
  10. Outline parasympathetic control of the heart
    • At rest its under parasympathetic tone by Vagus; which releases Ach
    • Decreases heart rate:
    • -- M2 receptors activated
    • -- Activate inhibitory G-protein
    • -- Reduce cAMP
    • -- Close Na and Ca channels
    • -- Opens K channels
    • -- Cell hyperpolarizes; more difficult to initiate AP
    • -- Slowing of heart rate
    • Decrease atrial force of contraction:
  11. Outline parasympathetic control of blood vessels
    Trick question…there is none. Its under SYMpathetic control
  12. Describe the micturition reflex
    • Bladder fills
    • Stretch receptors activate parasympathetic nerves
    • Contracts detrusor muscle
  13. Outline the parasympathetic control of:
    • Bronchial smooth muscle:
    • -- contraction; muscous secretion
    • GIT:
    • -- increase muscle tone and motility; stimulates secretions
    • Salivary glands:
    • -- stimulate secretions
    • Bladder:
    • -- detrusor muscle contraction (peeing)
    • Eye:
    • -- contracts constrictor pupillae muscles
    • -- contracts ciliary muscles (near vision)
    • Male function:
    • -- increase No and VIP
    • -- activate guanylate cyclase
    • -- increases cGMP
    • -- vasodilation

What would you like to do?

Home > Flashcards > Print Preview