Dil blood ko kaise pump karta hai

Ek mutthi jitna dil, din mein lakhon baar dhadakta hai, kaise?

Pehle dekhte hain dil ka structure: chaar chambers, jahan upar atria aur neeche ventricles hote hain.

Dil ki wall ki teen layers hoti hain: epicardium bahar, myocardium beech mein, aur endocardium andar. Myocardium sabse moti layer hai kyunki wahi contract hoke blood ko dhakelti hai. Ab blood ka poora raasta: right side body ka blood lungs bhejti hai, left side lungs ka blood body bhejti hai.

• Myocardium = pumping muscle

Is wajah se heart ko double pump kehte hain: ek circuit lungs ka, doosra poore body ka. Ab ek heartbeat ke stages dekhte hain: pehle atria bharte hain, phir contract hote hain, phir ventricles.

• Two circuits, ek hi heart

Pumping ka asli raaz valves hain: blood hamesha pressure ke gradient se ek hi direction mein behta hai. Jab ventricle ka pressure atrium se zyada hota hai, AV valve band hota hai, aur lub awaaz aati hai. Jab ventricle ka pressure artery se upar jaata hai, semilunar valve khulta hai; baad mein band hone par dub sunai deta hai.

• Lub = AV valves band
• Dub = semilunar valves band

Ab numbers dekho: normal blood pressure lagbhag 120 over 80 mmHg hota hai, jahan 120 systole ka pressure hai. Aam misconception hai ki dil sirf upar-neeche dhadakta hai; actually ventricles neeche se upar ki taraf nichodte hain, blood ko arteries mein dhakelte hue.

Ek edge case: agar valve leak kare, to blood wapas aata hai aur dil ko zyada kaam karna padta hai.

Bade picture mein, dil ki electrical signalling aur circulation hi ECG aur heart disease samajhne ki neev hai.

Ab socho: agar left ventricle ki wall bahut patli ho jaye, to sabse pehle kya problem hogi? Summary: dil ek double pump hai jahan valves aur muscle contraction milkar blood ko ek hi direction mein dhakelte hain.