Physiology of the Human Heart ❤️🫀💓

1. The Heart – Your Lifelong Beat Machine!

Think of your heart as a powerful, tireless pump—working 24/7 to keep you alive!

It’s about the size of your fist, but it’s got super strength!

2. Four Mighty Chambers 🏰

The heart has 4 chambers:

Right Atrium (RA) – receives used blood from the body 🟤

Right Ventricle (RV) – sends it to the lungs for oxygen 🫁

Left Atrium (LA) – receives fresh, oxygen-rich blood from the lungs 🔵

Left Ventricle (LV) – pumps it out to the whole body like a superhero! ⚡

3. The Valves – Heart’s Security Gates 🚪

Valves keep blood flowing in the right direction:

Tricuspid (RA → RV)

Pulmonary (RV → Lungs)

Mitral (LA → LV)

Aortic (LV → Aorta → Body)

These flap open and shut like doors to prevent backflow! ⛔

4. The Cardiac Cycle – Boom Boom Boom!

The heart follows a cycle:

Systole 🏋️‍♂️

Heart contracts and pumps blood out

Valves open, blood surges!

Diastole 🧘

Heart relaxes and fills with blood

Chambers refill like a sponge!

5. Electricity in Action ⚡

The SA node (Sinoatrial Node) is the natural pacemaker—

It sends electric pulses → making the heart beat in rhythm!

Path:

SA Node → AV Node → Bundle of His → Purkinje fibers

...and that keeps your heart beating in harmony like a drumline!

6. Blood Flow – The Double Circuit! ♻️

Two Circuits:

Pulmonary Circulation: Heart → Lungs → Heart

Systemic Circulation: Heart → Body → Heart

Oxygen in, CO2 out – that's the daily hustle of your heart!

7. Heart Rate & Output

Normal Heart Rate: 60–100 bpm

Cardiac Output = Heart Rate x Stroke Volume

(How much blood per minute? A LOT – around 5 liters/min at rest!)

Final Beat

Your heart is a muscular marvel and your life engine.

So fuel it with love, movement, and care!

Stay heart-healthy, stay unstoppable!