In lab 2, you learned that the neuron is one out of 3 excitable cells you will b
ID: 95161 • Letter: I
Question
In lab 2, you learned that the neuron is one out of 3 excitable cells you will be learning this semester. The other 2 excitable cells are muscle and heart. Apply what you have learned about the neuron to this heart scenario. For the heart to pump blood to the rest of the body, the heart cells have to fire an action potential to produce 1 heartbeat. In traditional methods of heart transplantation, the donor heart is injected with potassium chloride (KCl) to stop its beating, and then is packed on ice before rushing it off to the transplant recipient. What happens physiologically when KCl is administered to the donor heart? Would injecting the donor heart with NaCl have the same effect? Explain.
Explanation / Answer
Heart:It is a muscular pumping organ.It is located in the chest cavity slightly towards the left,enclosed in a double walled sac called pericardium.The heart made of muscle cells called cardiac muscle fibres.
heart is the main part of the body for transfer the oxyzen,nutrients,water etcthrough the blood for surviving the body.
Transplantion:It is a medical procedure in which an organ is removed from one body and placed in the body of a recipient,to replace a damaged or missing organ.
use of the kcl during the heart transplant---KCL injections cause hyperkalemia,or increased potassium in the blood.
increased blood k+ causes hyperpolarization of the cell membranes of the cardiac muscle cells because it increase s the positive charge outside the cell.This increase in resting membrane potential makes it more difficult for the cardiac muscle cells to depolarize which results in less muscle contraction of the heart and thus cardiac arrest.
Nacl doesn' t cause hyper polarization of cell membrane.
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