The cardiovascular system is nothing but a system of the heart. that is circulatory system function we gonna learn here, Heart is very important for running of life, for the existence of our life. here we provide all about the system of the heart is very simple language so that it will easy to learn for students not complicated words are used, easy to understand.
Circulatory system function
Cardiology is the branch of science which deals with the study of the heart and the diseases associated with it.
Anatomy of heart.
1)the heart is very small in size, roughly the same size as that of a person’s closed fist.
2)dimensions of the heart are about 12cm long,9cm wide, and 6cm in thickness.
3)the average weight of the heart is 250g in adult females and 300 g in adult males.
4)it consists of mainly 4 chamber-two atria and two ventricles.
Chamber of the heart
WHY ATRIA ARE THIN WALLED?
The atria are thin-walled because they only have to deliver blood into the ventricles.
The right and left sides of the heart act as two separate pumps. the left side of the heart has much greater work to perform than the right side of the heart.
WHY LEFT VENTRICLES WORKS MUCH HARDER THAN THE RIGHT VENTRICLES?
Because left ventricles pump blood to a great distance and at high pressure to other parts of the body.
Right ventricles pump blood only to the lungs(pulmonary circulation), the left ventricles pump blood to all other parts of the body(systemic circulation)
WHAT IS MEAN BY PULMONARY CIRCULATION?
Pulmonary circulation is the part of the circulatory system which carries
deoxygenated blood away from the right ventricles of the heart, to the
lungs, and returns and returns oxygenated blood to the left atrium and
ventricles of the heart.
all this is we are learning is a part of circulatory system function.
WHAT IS MEAN BY SYSTEMIC CIRCULATION?
Systemic circulation is the part of the circulatory system which carries oxygenated blood away from
heart to the body and return oxygenated blood to the back to the heart.
The heart has four chambers.
Two superior chambers
2) left atrium
Two inferior chambers
Explanation of the chambers of the heart.
1)Right atrium can be divided into the anterior part and posterior part.
2)superior vena cava is present at the upper posterior part and inferior vena
cava is present at the lower posterior part.
1)Externally, it is concave and forms a large part of the heart.
2)the wall of the heart ventricles varies greatly in thickness.
3) it is much thicker than the left ventricles.
(RIGHT VENTRICLES IS MUCH THICKER THAN THE LEFT
4)the wall of the right ventricles is thickest at its atria and thinner towards the apex
1)the wall of the left atrium is thicker.
2)it is smaller in shape than the right atrium.
3)four pulmonary veins open at the upper part of the left atrium.
4)the auricle opens into the left atrioventricular orifice guarded by the bicuspid
1)it functions as a powerful pump operating at the highest pressure and hence
its walls are 3 times thicker than that of the right ventricles.
2)it is cone-shaped, longer, and narrower than the right ventricle.
MECHANISM OF HEART AND MSBTE IMP
QUESTION-RELATED TO THE HEART
WRITE DOWN THE WORKING OF HUMAN HEART.
Blood flow through the heart.
1)through the inferior vena cava and superior vena cava all the deoxygenated
blood comes into the RIGHT ATRIUM by veins.
2)when the deoxygenated comes into right atrium is full due
to blood and pressure on the right atrium.
4) when the right atrium is full due to blood the tricuspid valve is open.
5) and then the blood comes into the right ventricle and the right ventricle is full due
6) when the blood comes into the right ventricle the tricuspid valve is just closed.
WORK OF TRICUSPID VALVE?
(Tricuspid valve is work to prevent backflow of blood from the right
ventricle to the right atrium.)
7)in the right atrium deoxygenated blood present, the pulmonary artery carries this deoxygenated blood from the right ventricle to the lungs
(LUNGS-deoxygenated blood converts into oxygenated blood and again returns to the left atrium by pulmonary veins.)
8)then after oxygenated blood comes into the left atrium, the left atrium is full due to blood and then blood is passed to the left ventricle.
9)bicuspid valve is present between the left atrium and left ventricle.
10)bicuspid valve is just opened and blood is passed to the left ventricle and left ventricle is full due to oxygenated blood and oxygenated is
passed to the aorta
11)aortic semilunar valve is present between the aorta and left ventricle to prevent backflow of blood from the aorta to the left ventricle.
12)then oxygenated blood comes into the aorta and by the arteries oxygenated blood supply to all our body.
#ARTERIES-arteries carries oxygenated blood away from the heart to
tissues and tissues carry to all over the body.
#PULMONARY ARTERIES-which carries deoxygenated blood to the lungs
#VEINS-which carries deoxygenated blood to the heart.
#PULMONARY VEINS-which carries oxygenated blood from lungs to
#TRICUSPID VALVE-between right atrium and right ventricle.
#BICUSPID VALVE-between left atrium and left ventricle.
#AORTIC SEMILUNAR VALVE-between aorta and left ventricle.
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