uomitCig youl ainswers until the last possible second just in case there are som
ID: 3477939 • Letter: U
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uomitCig youl ainswers until the last possible second just in case there are some issues with your submission Based on the following scenarios below, tell me whether cardiac output would increase or decrease and WHY. Answers may be used more than once or not at all. There is no partial credit for having the correct direction of change and the incorrect reasoning or vice versa; these questions are all or none. ( /a point each) decreased circulating epinephrine drug that stimulates noradrenergic receptors increased activity of T-type calcium channel increased parasympathetic input to the heart a) b) c) d) e) f) decrease in cardiac output due to decrease in both stroke volume and heart rate decrease in cardiac output due to decrease in heart rate decrease in cardiac output due to decrease in stroke volume increase in cardiac output due to an increase in both stroke volume and heart rate increase in cardiac output due to increase in heart rate increase in cardiac output due to increase in stroke volume Select whether each of the following statements is true of action potentials in conducting cells, action potentials in cardiac myocytes, or action potentials in both cell types. (/4 point each) requires increased calcium permeability requires T-type calcium channels requires simultaneous permeability to calcium and potassium return to negative voltages is facilitated by potassium movement a) conducting cells b) cardiac myocytes c) both . .Explanation / Answer
Answer
a. Decreased circulating epinephrine leads to
increased cardiac output due to an increase in both stroke volume and heart rate.
- increased cardiac output due to an increase in heart rate
- increased cardiac output due to an increase in stroke volume.
Stimulation of Beta 1 receptors are leads to increased contractility and heart rate. beta 1 receptors are more sensitive to epinephrine.
b. Stimaltion of nor adrenergic receptors leads to
-increased cardiac output due to an increase in both stroke volume and heart rate.
- increased cardiac output due to an increase in heart rate
- increased cardiac output due to an increase in stroke volume.
The nor adrenergic receptos are alpha and beta receptors.
stimulation of alpha and beta receptors by agonist like norepinephrine produces positive chronotropy,positive dromotropy and positive inotropy.
c. increased activity of T type calcium channels
it is not matche with any one because T–type calcium channels are suitable for opening from very negative membrane potentials for regulating neuronal excitability.
d. Increased parasympathetic inputs to heart
Decreases cardiac output due to an decrease in both stroke volume and heart rate.
- decreased cardiac output due to an decrease in heart rate
- decreased cardiac output due to an decrease in stroke volume.
because parasympatheic stimulation produces negative chronotropy,negative dromotropy and negative inotropy.
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