Heart anatomy and physiology

Question 1

Left coronary artery

Answer 1

Gives rise to anterior interventricular artery
Supplies oxygenated blood to the anterior ventricles

Question 2

Right coronary artery

Answer 2

Gives rise to right atrium - posterior interventricular artery
Supplies oxygenated blood to the posterior ventricles

Question 3

Great cardiac vein

Answer 3

Drains deoxygenated blood from the anterior ventricles

Question 4

Middle cardiac vein

Answer 4

Drains the posterior ventricles

Question 5

Intrinsic system

Answer 5

1. SA node - peacemakers cells depolarizes 100 times per min
2. AV node pauses for 0.1 sec
3. AV bundle connect atria to ventricles
4. Bundle branches conducts depolarization through the interventricular septum
5. Purkinje fibres - depolarize the ventricular myocardium

Question 6

ECG

Answer 6

P wave - atria, depolarize, triggers systole in atria
QRS complex - ventricle, depolarize, triggers systole in ventricle
T wave - ventricular repolarization results in ventricular diastole

Question 7

Stroke volume

Answer 7

Volume of blood pumped out of ventricle with each beat

Question 8

Stroke volume factors

Answer 8

ESV - Afterload Contractility
EDV (preload) - venus return, passive filling time

Question 9

Venus return

Answer 9

Amount of blood returning to the heart from systems or pulmonary circuit

Question 10

Passive filling time

Answer 10

Time both the atria and ventricles are in diastole

Question 11

Preload

Answer 11

Degree in myocardium stretched before it contracts

Question 12

Contractility

Answer 12

Amount of force produced by myocardial contraction

Question 13

Afterload

Answer 13

The pressure that the ventricles must overcome to open SL valve to eject blood into the arteries