The Heart: Its Anatomy & Physiology

Blood vessels that carry blood back to the heart from lungs *but* they carry *OXYGENATED* blood. #8 in picture

• PULMONARY arteries

• aorta

• PULMONARY veins

• vena cava

Blood vessels that carry blood away from the heart *but* they carry *DEOXYGENATED* blood. #6 in picture

• aorta

• PULMONARY veins

• vena cava

• PULMONARY arteries

Tags

NGSS.MS-LS1-3

TYPE of blood flow that cycles from the right ventricle to the lungs and back to the left atrium

• systemic circulation
• pulmonary circulation

TYPE of blood flow that cycles to the body tissues; allows for oxygen to be distributed to all the cells of the body.

• systemic circulation
• pulmonary circulation

First part of Cardiac Conduction System: This *PACEMAKER* sends action potentials to both atria causing them to contract.

• Sinoatrial (SA) Node

• AV node

Second part of Cardiac Conduction System: This structure receives a signal and passes it on to the Bundle of His

• Purkinje fibers

• Atrioventricular (AV) node

• Sinoatrial (SA) Node

Third part of Cardiac Conduction System: This structures branches down from septum and out towards each ventricle. They *relay* the signal to the Purkinje fibers.

• Atrioventricular (AV) node

• Sinoatrial (SA) Node

• Bundle of His

• Purkinje fibers

They send action potentials to the cells in the ventricles, causing them to contract.

• Atrioventricular (AV) node

• Sinoatrial (SA) Node

• Bundle of His

• Purkinje fibers

Tags

NGSS.MS-LS1-3

Part of the cardiac cycle where Ventricles relax: Semilunar valves shut to prevent backflow. Blood flows into ventricles from atria due to drop in pressure.

• diastole phase
• systole phase

Part of the cardiac cycle where Ventricles contract: Blood pumps out of ventricles, AV valves shut to prevent backflow.

• diastole phase
• systole phase