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Medical Physics > Heart > Flashcards

Flashcards in Heart Deck (13)
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1

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

2

Blood flow in the heart (Have fun!)

-Vena Cavae
-Right Atrium
-Tricuspid valve
-Right Ventricle
-Pulmonary artery
-Lungs
-Pulmonary veins
-Left Atrium
-Mitral Valve
-Left Ventricle
-Aorta and the body

3

What carries electrical signals all over the body

Nerves

4

Resting potential of cell

High level of K ions in cell high level of Na ions outside of cell

Have a pd of -70mv

5

What does an action potential mean for the cell?

Cell was stimulated

6

When's cell is stimulated what happens to the cell membrane?

Becomes permeable for the Na ions outside of the cell.

7

Why would Na ions enter the cell?

Concentration gradient inside the cell and outside attracts it

8

What is the pd of the cell makes the Na ions speed up

-55mv

9

What happens in depolarisation

When flow of Na ions in the cell makes the pd go from-70mv to 0

10

What is reverse polarisation??

Takes place after depolarisation and is when the Na ions keep flowing in the cell making pd 30mv

11

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

12

What happens directly after Repolorisation

Cell pumps ions along the membrane until the ions are back in the right place

13

What is overshoot?

Happens while a cell is repolarising cell goes past -70mv