October 22, 2019

circulatory system function

cardiovascular system is nothing but system of heart.that is circulatory system function we gonna learn here,Heart is very important for running of life,for the existance of our life.here we are provide all about   system of heart in very simple language so that it will easy to learn for students not complicated words are used,easy to understand.

circulatory system function

Cardiovascular system

Cardiology is the branch of science which deals with the study of 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 persons closed fist.
2)dimensions of the heart is near about 12cm long,9cm wide,and 6cm thickness.
3)the average weight of the heart is 250g in adult females and 300 g in adult males.
4)it consist of mainly 4 chamber-two atria and two ventricles.

Chamber of the heart


QUESTION?
WHY ATRIA ARE THIN WALLED?
The atria are thin walled because they only have to deliver blood into the ventricles.
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 right side of the heart.

QUESTION?
WHY LEFT VENTRICLES WORKS MUCH HARDER THAN THE RIGHT VENTRICLES?
Because left ventricles pumps blood to a great distance and at a high pressure to other parts of the body.
Right ventricles pumps blood only to the lungs(pulmonary circulation),the left ventricles pumps blood to all other parts of the body(systemic circulation)

QUESTION.
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 funtion.
WHAT IS MEAN BY SYSTEMIC CIRCULATION?

Systemic circulation is the part of 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
1)Right atrium
2) left atrium
Two inferior chambers
1)Right ventricles
2)Left ventricles

Explanation of the chambers of the heart.

Right atrium
1)Right atrium can be divided into 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.
Right ventricles
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
VENTRICLES.)
4)the wall of the right ventricles is thickest at its atria and thinner towards the apex
ventricles.

LEFT ATRIUM

1)the wall of the left atrium is thicker.
2)it is the smaller in shape than then right atrium.
3)four pulmonary veins open at upper part of the left atrium.
4)the auricle opens into the left atrioventricular orifice guarded by the bicuspid
valve.

LEFT VENTRICLE

1)it function as a powerful pump operating at the highest pressure and hence
its walls are 3 times thicker as 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

QUESTION-

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 RIGHT ATRIUM by veins.
2)when the deoxygenated comes into right atrium the 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 right ventricle and right ventricle is full due
to blood
6) when the blood comes into right ventricle the tricuspid valve is just closed.

QUESTION-

WORK OF TRICUSPID VALVE?
(Tricuspid valve is work to prevent backflow of blood from right
ventricle to right atrium.)

7)in right atrium deoxygenated blood present,pulmonary artery carries this deoxygenated blood from right ventricle to lungs
(LUNGS-deoxygenated blood converts into oxygenated blood andagain returns to left atrium by pulmonary veins.)
8)then after oxygenated blood comes into left atrium ,the left atriumis full due to blood and then blood is passed to left ventricle.
9)bicuspid valve is present between left atrium and left ventricle.
10)bicuspid valve is just opened and blood is passed to left ventricle and left ventricle is full due to oxygenated blood and oxygenated is
passed to aorta
11)aortic semilunar valve is present between aorta and left ventricle to prevent back flow of blood from aorta to left ventricle.
12)then oxygenated blood comes into aorta and by the arteries oxygenated blood supply to the all our body.

IMPORTANT-

#ARTERIES-arteries carries oxygenated blood away from the heart to
tissues and tissues carries to all over body.

#PULMONARY ARTERIES-which carries deoxygenated blood to lungs
for oxygenation.

#VEINS-which carries deoxygenated blood to the heart.

#PULMONARY VEINS-which carries oxygenated blood from lungs to
heart.

#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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