Flashcards
ANS
Cards in this deck (18)
- 1What is divergence?Each preganglionic cell synapses on many postganglionic cells
- Results in mass activation of multiple target organs - 2Which structures are innervated by each spinal nerve?Sweat glands, arrector pili (hair on arms), blood vessels to skin & skeletal
- 3ANS neurotransmitters are classified as what two types of neurons?Cholinergic or adrenergic depending on the neurotransmitter released
- 4Where are cholinergic receptors excitatory and inhibitory?Excitatory at neuromuscular junction.
Usually inhibitory at CNS - 5cholinergic neurons release acetylcholine from which neurons?- All preganglionic neurons.
- All parasympathetic postganglionic neurons - 6Adrenergic neurons release noradrenaline from...Postganglionic sympathetic neurons only
- 7Adrenergic neurons excite or inhibit organs depending on...receptors
- 8The main types of adrenergic receptors are...Alpha1 and Beta1 = excitation
Alpha2 & Beta2 = inhibition
Beta3 = (brown fat) increases thermogenesis - 9Which neurotransmitters effects are longer lasting?Adrenergic
- 10What is an Agonist?a substance that binds to and activates a receptor, mimicking the effect of a natural neurotransmitter or hormone
- 11What is an antagonist?a substance that binds to and blocks a receptor, preventing a natural neurotransmitter or hormone from exerting its effect
- 12Parasympathetic responsesSLUDD = salivation, lacrimation, urination, digestion, defacation
Also ↓ HR, ↓ diameter of airways, ↓ diameter of pupil - 13A visceral autonomic reflex adjusts the activity of a visceral effector, often unconsciously, for example...•changes in blood pressure, digestive functions etc
•filling & emptying of bladder or defecation - 14The main types of cholinergic receptors are...Nicotinic = excitation
Muscarinic = Excitation/inhibition - 15Where are nicotinic receptors found?On dendrites & cell bodies of postganglionic ANS cells & at NMJ
- 16Where are muscarinic receptors found?On plasma membranes of all parasympathetic effectors (cardiac, smooth muscle & glands)
- 17Where does the ANS receive input from?from limbic system & other regions of cerebrum
- 18What 2 brain structures is the ANS regulated by?The hypothalamus and brain stem
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- Nervous System (Sensory) Flashcards on ANS, created by travel_bug on 21/10/2013.
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