GCSE Biology - The Circulatory System | The Heart (2026/27 exams)

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** WHAT'S COVERED **
1. The Circulatory System as an Organ System
Organs involved: Heart, Blood Vessels, Blood
Function: Transporting substances around the body
2. The Double Circulatory System
Pulmonary Circuit (Heart-Lungs-Heart)
Systemic Circuit (Heart-Body-Heart)
3. Structure of the Human Heart
Four chambers: Right Atrium, Left Atrium, Right Ventricle, Left Ventricle
Atrioventricular valves and their function
Explanation of left/right orientation in diagrams
Difference in wall thickness between ventricles
4. Major Blood Vessels Connected to the Heart
Vena Cava
Pulmonary Artery
Pulmonary Vein
Aorta
Path of blood flow through the heart, lungs, and body
5. Coronary Arteries
Function: Supplying the heart muscle with oxygenated blood

** CHAPTERS **
0:00 Introduction
0:26 What is the Circulatory System?
1:23 Double Circulatory System
2:13 Structure of the Heart (Chambers & Valves)
3:27 Naming the Heart Chambers & Valves
4:04 Blood Vessels of the Heart & Blood Flow Path
5:48 Coronary Arteries

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