Cardio

Question 1

Where does the superior mesenteric vein drain into?

Answer 1

Portal vein

Question 2

What supplies the AV node with blood?

Answer 2

Right coronary artery

Question 3

Where does the coeliac trunk branch off the aorta?

Answer 3

T12

Question 4

What are the ECG changes and artery for anteroseptal?

Answer 4

V1-V4, LAD

Question 5

What are the ECG changes and artery for inferior

Answer 5

2,3 and AVF, Right coronary

Question 6

What are the ECG changes and artery for anterolateral

Answer 6

V4-V6, I and aVL, LAD or L circumflex

Question 7

What are the ECG changes and artery for lateral

Answer 7

I, aVL, V5-V6 and left circumflex

Question 8

What are the ECG changes and artery for posterior

Answer 8

V1-V2, and tall R waves, left circumflex or right coronary

Question 9

Describe how adenosine works?

Answer 9

In vascular smooth muscle: adenosine binds to adeonsine type 2a receptors coupled to Gs, this phosphorylates adenylyl cyclase -> increasing cAMP -> inhibits myosin light chain -> smooth muscle relaxation -> decrease in contractile force

In cardiac muscle: activates alpha 1 receptors which are coupled to Gi -> open aCH potassium channels causing hyperpolarisation. Also decreases cAMP