Flashcards in Heart Deck (13)
Double pump- how does that describe the heart??
Refers to fact:
-Right side of heart pumps blood from body to lungs
-Left side of heart pumps blood from
lungs to body
Blood flow in the heart (Have fun!)
-Aorta and the body
What carries electrical signals all over the body
Resting potential of cell
High level of K ions in cell high level of Na ions outside of cell
Have a pd of -70mv
What does an action potential mean for the cell?
Cell was stimulated
When's cell is stimulated what happens to the cell membrane?
Becomes permeable for the Na ions outside of the cell.
Why would Na ions enter the cell?
Concentration gradient inside the cell and outside attracts it
What is the pd of the cell makes the Na ions speed up
What happens in depolarisation
When flow of Na ions in the cell makes the pd go from-70mv to 0
What is reverse polarisation??
Takes place after depolarisation and is when the Na ions keep flowing in the cell making pd 30mv
What is Repolarisation
At 30mv cell membrane is impermeable to Na ions but permeable to K ions so they leave the cell so pd is back to -70mv
What happens directly after Repolorisation
Cell pumps ions along the membrane until the ions are back in the right place