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Stack #225805
| Question | Answer |
|---|---|
| sensory neuron (afferent) | from sensory receptors to Cns |
| motor neuron (efferent) | from cns to effetor organs |
| autonomic motor nerves | conducts an ap to involuntary organs |
| autonomic nervous system | has 2 divisions sympathetic and parasympathetic |
| sympathetic | fight or flight |
| parasympathetic | rest and digest |
| the ANS involves | 2 neurons |
| postganglionic neuron cell bodies are located | sympathetic chain ganglia, collateral ganglia, adrenal medulla |
| preganglionic neuron cell bodies are located | brain & spinal cord |
| neurons that release acetylcholine are | cholenergic neurons |
| neurons that release norepinephrine are | adrenergic neurons |
| types of receptors | cholinergic and adrenergic |
| types of cholinergic receptors | muscurinic and nicotinic |
| types of adrenergic receptors | alpha 1 beta 1 beta 2 |
| alpha 1 | vasoconstriction of blood vessels, results in dilation pupils |
| beta1 | increase in heart rate, increase in contractility |
| beta2 | vasodialation of arterioles and dialation of bronchioles |
| epinephrine | alpha 1, alpha 2, beta 1, beta 2 |
| norepinephrine | alpha 1 alpha 2 and beta 1 |
| what is meant by membrane potential | potential energy stored in a cell membrane measured using voltage |
| do different types of cells have the same mp | no |
| what does the sign + or - indicate on the voltage meter | the charge of the particle inside |
| at rmp of -90 where are the + and - signs located | alonge the cell membrane or throughout the cytoplasm |
| what are the three factors that determine the rmp of a cell | permability difference na/k non gated channels, na/k atpase pump, |
| permability means | for every na+ that enters 50-100 k+ will leave |
| atpase pump means | 2 k+ enter 3 na+ leave |
| hyper polerization | increase in rmp |
| depolerization | decrease in rmp |
| repolerization | return to rmp |
| excitable cells | change the voltage of rmp the change is done through gated channels |
| what is meant by summation of graded potential where does it occur | hperpol. and depol are added togetherproximal to sensory receptors and axon hillock |
| what is meant by threshhold | voltage required for opening of voltage gated channels |
| what type of channels are found on dendrites | ligand gated channels |
| what type of channels are found on cell bodies | ligand gated |
| what type of channels are found on the axon and axon hillock | voltage gated channels |
| what are the three steps of ap | increase in na+ perm , closure of voltage ate d channles, increase in k+ perm |
| why are the ap potentials conducted faster on mylentated nerves then unmylentated | b/c the nodes are depolerized |
| what happens when ap reaches the end of the axon | causes depol of the vg calcium channels |
| membrane potentials | must start at resty -90 ^ depol(-) decrease \/ hyper(+) increase the threshold is - 50 |
| everything is colenergic except | symp smooth cardiac gland |
| somatic | skeletal you control |
| autonomic | you cant control |
Created by:
ablue218