Biology Unit 5
B1: Cardiovascular system.
The structures and functions of the heart.
Aria:
These receive blood from the
vein, through thin walls of the
upper two chambers. Blood
gets pumped back into the
heart from around the body.
The right atrium receives
deoxygenated blood which is
coming back to the heart from
the vena cava. Whereas the
left atrium it’s the opposite, it
receives oxygenated blood,
which is returning to the
heart as well, however from the pulmonary vein.
Ventricles:
In the heart, the left ventricle is where oxygen-rich blood is pumped to the
body, which is done with a large network of arteries, whereas in the right
ventricle the blood is being passed to the pulmonary artery, which is then
transported towards the lungs, this is done so that the blood can receive
oxygen to make it oxygen-rich blood.
Septum:
This is where the heart is divided into the right and the left side, with
ventricles being separated by a wall of muscle which is referred to as the
septum. The septum is present as it helps with preventing the mixing of
oxygenated and deoxygenated blood, as well as consisting of muscle and
connective tissue.
Valves: [semi-lunar, tricuspid, bicuspid].
The semi-lunar valve, is a valve which connects the ventricles to the arteries
which are the aorta and the pulmonary artery, this also is present to help
with the prevention of the back flow of blood into the heart. If back flow
was to occur, then this would be a risk as it can progress over time causing a
B1: Cardiovascular system.
The structures and functions of the heart.
Aria:
These receive blood from the
vein, through thin walls of the
upper two chambers. Blood
gets pumped back into the
heart from around the body.
The right atrium receives
deoxygenated blood which is
coming back to the heart from
the vena cava. Whereas the
left atrium it’s the opposite, it
receives oxygenated blood,
which is returning to the
heart as well, however from the pulmonary vein.
Ventricles:
In the heart, the left ventricle is where oxygen-rich blood is pumped to the
body, which is done with a large network of arteries, whereas in the right
ventricle the blood is being passed to the pulmonary artery, which is then
transported towards the lungs, this is done so that the blood can receive
oxygen to make it oxygen-rich blood.
Septum:
This is where the heart is divided into the right and the left side, with
ventricles being separated by a wall of muscle which is referred to as the
septum. The septum is present as it helps with preventing the mixing of
oxygenated and deoxygenated blood, as well as consisting of muscle and
connective tissue.
Valves: [semi-lunar, tricuspid, bicuspid].
The semi-lunar valve, is a valve which connects the ventricles to the arteries
which are the aorta and the pulmonary artery, this also is present to help
with the prevention of the back flow of blood into the heart. If back flow
was to occur, then this would be a risk as it can progress over time causing a
