Slides in this set
Humans (all mammals) have a double circulation.
Blood flows from the right side of the heart into the ?
After blood is oxygenated in the lungs it returns to the left side
of the heart.
From here it enters the ? systemic circulation.
When the blood passes through the the capillary bed of the lungs
it loses pressure. By passing through the left side of the heart
before continuing around the body the pressure can be increased
allowing the oxygenated blood to reach the organs of the body
The heart is the pump for both these circulations.
LV = Left Ventricle
RV = Right Ventricle
LA = Left Atrium
RA = Right Atrium
AS = Atrial Septum
VS = Ventricular Septum
1 = Tricuspid Valve
2 = Right Semi Lunar Valve
3 = Bicuspid Valve
4 = Left Semi Lunar Valve
Ao = Aorta
PA = Pulmonary Artery
SVC = Superior Vena Cava
Label the parts of the Heart IVC = Inferior Vena Cava…read more
Cardiac muscle tissue consists of branched, faintly striated fibres (cells), each of
which contains a centrally placed nucleus.
Cardiac muscle tissue forms networks due to its branching structure.
When one muscle fibre is electrically excited, an impulse is quickly
transmitted to neighbouring fibres such that impulses spread in all directions
when cardiac muscle is stimulated.…read more
This photomicrograph of cardiac muscle tissue shows the branching nature