Lecture 2 – Cardiac Cycle

Question 1

Convection

Answer 1

Mass movement of fluid caused by pressure difference

Question 2

Electrical conduction (4)

Answer 2

SAN - right atrium
AVN - Conduction is delayed allowing the fillinf of ventricles.
ventricles.
3) Conduction occurs rapidly through bundle of His into ventricles.
4) Conduction through Purkinje fibres spreads quickly throughout the ventricles.

Question 3

SA Pacemaker potentials (3.5)

Answer 3

Phase 4: Pacemaker potentials
Phase 0
Phase 3

FLASH CARD

Question 4

Atrial and ventricular muscle action potentials (5)

Answer 4

FLASH CARD

Question 5

Blood flow - Deoxygenated

Answer 5

SVC/IVC –> RA –> Tricuspid –> RV –> Pulmonary valve –> Left/Right pulmonary artery

Question 6

Blood flow - Oxygenated

Answer 6

Pulmonary vein –> LA –> Bicuspid –> LV –> Aortic valve –> Aorta

Question 7

Cardiac cycle - chamber and volume changes (4)

Answer 7

document

Question 8

Ventricular pressure-volume loop (3)

Answer 8

Work = Change in ventricle pressure x Change in volume.
Area inside loop = amount of work done.
SV = end systolic volume - end diastolic volume.

Question 9

Right atrial cycle and jugular venous pressure (3) Graph (4)

Answer 9

Jugular vein will drain the blood from the heart into SVC/right atrium.
Pressure is the same in both.
Bulging jugular vein can indicate heart disease.

A wave
X descent
V wave
Y descent