Cardiovascular System. Components of the Cardiovascular System Generating & Measuring heart impulses. Cardiovascular System. Components of the Cardiovascular System Generating & Measuring heart impulses. Cardiovascular System. Myths and Facts. Myths and Facts. Emotions. Myths and Facts.
Our circulatory system is a “closed” system
Our circulatory system is a “complete, double” system
site of gas exchange
Two (2) main circuits:
a) The Pulmonary circuit – blood vessels that carry blood to the lungs where it picks up oxygen and then back to the heart.
b) The Systemic circuit – blood vessels
that carry oxygen rich blood to the
body tissues and deoxygenated
blood back to the heart.
A third minor circuit:
c) The Coronary circuit– blood vessels
surround the heart to provide it
site of gas exchange
1. The heart is really a double pump separated in
the middle by a wall called a septum.
neck and head
trunk and legs
blood exchange in the capillaries
Blood from heart blood going to heart
When tending wound, apply ice or cold solution to constrict blood flow!
superior vena cava
left pulmonary vein
right pulmonary vein
left pulmonary artery
right pulmonary artery
inferior vena cava
Sinoatrial (S.A.) Node:
the pace maker of the heart.
beats are regulated at about 72 beats/min.
its activityistriggeredby the swelling of
the atrial walls.
once activated, it triggers the A.V. node.
Atriaventricle (A.V.) Node:
isanother pace maker
it prepares the fibres in the septum to
contract the Right and Left Ventricles.
Valves: there are two (2) types of valves
located between the atria and ventricles.
has three or two flaps
these valves open when the atria contract,
once the ventricles have filled, the AV valves
snap shut to prevents the backflow of blood
to the atria.
2. Semi-lunar valves:
has three (2) flaps
these open when the ventricles contract.
on the right, blood is pumped to the
pulmonary artery, and simultaneously on the
left, blood is pumped into the aorta)
once completed, these valves snap shut to
prevents the backflow of blood into the
“Lubb-dubb”: Heart sound ‘lubbdubb’ is the shutting of the two sets of valves respectively.
Blood pressure: your pulse (feel as a surge of blood passes through your arteries.)