Question

Ch -the circulatory system .


Answer the que

☆The Heart .☆


in brief - Very explainable


♥Content quality♥

♡No spamming ♡

Answer 1

Hey friend here is your answer......

Answer :

The Heart :

The heart is a muscular organ, roughly of the shape and size of a closed fist . It is located between the lungs, with its pointing towards the left . A protective double membraned bag called the pericardium surrounds the heart . The space between the membranes is filled with pericardial fluid , which functions as a shock absorber . An  adults heart  measures about 12 CM in length and 9 cm and breadth, and weighs about 300 gram .

The heart is made up of specialised muscles called cardiac muscles . These work without rest and keep the heart functional throughout life . The heart pumps an average of 5 litre of blood per minute .

The heart consists of four Chambers . The two upper Chambers have thin walls, and are called the right auricle and left auricle . The auricles  are also called atria (singular : attrium)

The two lower Chambers have thick walls, and are called the right ventricle and left ventricle . Oxygenated and deoxygenated blood enter different sides of the heart ( left and right respectively ) . Fibrous walls  separate the two sides of the heart, to prevent the mixing of oxygenated and deoxygenated blood . The  thin , fibrous wall that separates the two auricles  is called the Interatrial septum ( 'septum' comes from a latin word meaning 'fence' , or 'partition' ). The interventricular septum separate the two ventricles, and is thicker than the interatrial septum . The right auricle and right ventricle are separated by the tricuspid valve . This valve has three cusps ( leaflets , or flaps,  of tissue)  that close to prevent the backflow of blood from the right ventricle into the right auricle when the right ventricle contracts . The left auricle and left ventricle are separated by the bicuspid valve , which has two cusps that prevent backflow .

# Be Brainly

# Love Brainly

Hope it helps you if it so please make it as brainliest......❤✨❤✨❤

Answer 2

Heya mate ✌ here going to explain our heart in brief hope it will helps u :)☆☆☆


$\huge \bold{the \: heart}$
☆some important points related to heart ☆

☆It is a part circulatory system.
It remains safe in the pericardial membrane .It 's weight is approx 300 grams.

Heart of the human is made up of four chambers. In the anterior side there is a right auricle & and a left ventricle persist.In the posterior side of the heart there is a right ventricle & a left ventricle persist.

》》》B/w the right auricle & the right ventricle there is a tricuspid valve.
》》》B/w the left auricle & left ventricle there is a bicuspid valve.


》》》Blood vessels carrying the blood from the body towards the heart is called vein.

》》》In the vein there is impure blood. i.e carbon dioxide mixed blood. Its exception is pulmonary vein, which is always carry pure blood.
》》》pulmaonary vein carries the blood from lungs to left auricle.It has pure blood.

》》》The blood vessels carrying the blood from the heart towards the body is called artery.
》》》 In artery there is pure blood. i.e Oxygen mixed with blood .It exception is pulmonary artery.
》》》pulmonary artery carries the blood from right ventricle to lungs.It contains impure blood.
》》》In the right part of the heart, these remains impure blood. i.e. carbon dioxide mixed blood and in the left part of the heart there remains pure blood i.e. oxygen mixed blood.
》》》The artery carrying blood to the muscles of the heart are called coronary arteries. Any types of hindrance in it causes heart attack.

$\bold \red{course \: of \: circulation}$

☆Mammals have double circulation. it mean blood have to cross two times from heart before circulating throughout the body.

>>>Right auricle receive impure blood from the body which goes into right ventricle. from here the blood went into pulmonary artery which send it to the lung for purification. After purification it is collected by pulmonary vein which bring it back to heart in left auricle.
from auricle it went into left ventricle now this purified blood is went into aorta for different organ of body.

This circulation is done is a cardic cycle.
_______________________________

$\boxed{cardic \: cycle}$
Rhythmic systole (contraction) and diastole (relaxation) of auricle & ventricle constitutes a cardiac cycle.

$\boxed{heart \: beat}$
Heart keeps beating rhythmically throughout the life. There is a node from which originate of heart.
___________________________

$\bold{some \: more \: important \: points}$
☆The blood pressure of a normal human is 120/80 . (systolic -120 & Diastolic -80)

☆B.p is measured by sphygmomanometer.
☆Thyroxin & adrenaline are the hormones which independently controls the heart beat.

☆The carbon dioxide present in the blood accelerates the heart beat by reducing the pH.
___________♢♢♢______________

$\blue{thank \: you...}$


#Be_brainly ☆☆☆