Summary of Types of Circulations in Humans | Double circulation | Chapter circulation Video 3

Summary

The video discusses the types of circulation in the human body, focusing on the concept of Double Circulation, which consists of two main circuits: Pulmonary Circulation and Systemic Circulation.

Double Circulation: The human circulatory system has two distinct circuits that operate simultaneously:
- Pulmonary Circulation:
  - Begins in the Right Ventricle of the heart.
  - Deoxygenated blood (often represented in blue) is pumped through the pulmonary artery to the lungs.
  - In the lungs, carbon dioxide is exchanged for oxygen, resulting in oxygenated blood (represented in red).
  - The oxygenated blood returns to the heart via the Pulmonary Veins into the Left Atrium.
- Systemic Circulation:
  - Starts in the Left Atrium where oxygenated blood is received.
  - Blood moves down to the left ventricle, which pumps it out through the Aorta to supply the entire body.
  - As oxygen is delivered to tissues, the blood becomes deoxygenated and returns to the heart via the superior and inferior vena cavae.

Pulmonary Circuit:
- Blood flows from the Right Ventricle → pulmonary artery → lungs (oxygenation) → Pulmonary Veins → Left Atrium.
Systemic Circuit:
- Blood flows from the Left Atrium → left ventricle → Aorta → body tissues (oxygen delivery) → deoxygenated blood returns via superior/inferior vena cavae → right atrium.