HEART ppt....basic knowledge that everybody should know :)
you can take help of this ppt for your school projects or just to gain knowledge about the organs of your body and its functions .
I would upload more ppt about different organs of human body ...you can check later on.
3. The size of your heart is almost the same as the size of your clenched fist.
Men have larger hearts than women.
Athletes engaged in high-intensity training tend to have larger hearts, too.
The heart weighs in the range of 7 and 15 ounces (200 to 425 grams).
By the end of a long life, an individual’s heart might have extended and contracted more
than 3.5 multiple times, which is a sign of the normal working of the human heart.
The double-layered covering called the pericardium surrounds the heart like a sac.
It consists of 2 layers. The external layer is fibrous in nature and is called the parietal
layer and the internal layer is smooth and is called the visceral layer.
The pericardium provides mechanical protection for the heart and the large blood
vessels and helps in reducing the friction between the heart and the surrounding
structures.
STRUCTURE OF HEART
4.
5. What Constitutes Your Heart?
Different Layers of the Heart Wall
Three layers of tissue form the heart
wall namely:
Epicardium – the external
layer
Myocardium – the centre layer
Endocardium – the innermost
layer
Together, these three layers play a significant
role in the normal working of the human
heart.
6.
7. Valves of the Heart -
Howdo they help withbloodflow?
The heart valves act like gates at the chamber openings, they open and close to allow blood to flow through the
chambers. Their main function is to ensure that blood flows only in one direction through the heart.
The atrioventricular (AV) valves are located between your upper and lower heart chambers.
They include:
Tricuspid valve – This valve opens to facilitate blood flow from the right atrium to the right ventricles.
Mitral valve – This valve opens to allow blood to flow from the left atrium to the left ventricle.
Semilunar (SL) valves, which are located between the ventricles and the arteries that emerge
from the heart, consist of:
Aortic valve – This valve manages the blood flow from the left ventricle to the aorta.
Pulmonary valve – This valve opens to allow blood to flow from the right ventricle to your pulmonary artery.
For a healthy functioning of valves, it is important that:
The valve is properly formed and flexible.
The valves are able to open fully so that the blood can pass through without any obstruction.
10. Blood circulation takes place through two
circuits in the heart.
The first is called the pulmonary circuit
(across the lungs) and the second is the
systemic circuit (across the body).
It is in the pulmonary circuit that the
deoxygenated blood exits the right
ventricle through the pulmonary artery and
reaches the lungs.
This blood returns as oxygenated blood to
the heart through the pulmonary vein.
11. Blood pressure originates as a result
of the pumping action of the heart.
It is a measurable force exerted by
blood against the walls of blood
vessels.
The vessels stretch in response to
this force and the resultant
contraction is pivotal in maintaining
a normal blood flow through the
vascular system.
