Where gas exchange takes place (alveoli and bronchioles)
Conducting zone
Rest of the respiratory system that transported, filtered and moistened air
External respiration
Respiration occurring in the lungs (outside air)
Internal respiration
Respiration happening within the other body cells
Bicuspid and Tricuspid
Located between the atrium and ventricle
Semi-lunar valves
Located between ventricles, aorta and pulmonary
Additional structures of the heart
Chordae Tendineae (Fibrous strings to support the tricuspid and bicuspid valves)
Papillary Muscles (Muscles inside the ventricular wall)
Heartbeat
1. Caused by a series of electrical impulses in the heart
2. Pulses in the Sinaatral (SAD node)
3. Pulses in the Atrioventricular (AV node)
4. Pulses in the His-Purkinje network
5. SA node fires again to repeat this process
Electrical impulses and the heart cycle
The electrical pulses that move through the SA and AV nodes and His-Purkinje (HP) network causes atrial diastole, systole and ventricular diastole systole
