Structure of the heart, movement of blood through the heart, types of blood vessel
❤ 1. Structure of the Heart
Key Parts and Function:
Part | Function |
|---|---|
Atria (right & left) | Receive blood into the heart |
Ventricles (right & left) | Pump blood out of the heart |
Valves (e.g., tricuspid, bicuspid/mitral, semilunar) | Prevent backflow of blood |
Aorta | Carries oxygenated blood to the body |
Pulmonary artery | Carries deoxygenated blood to the lungs |
Pulmonary vein | Carries oxygenated blood from lungs to heart |
Vena cava (superior & inferior) | Carries deoxygenated blood from body to heart |
Septum | Wall separating left & right sides of the heart |
Key Tip: Right side → deoxygenated blood, Left side → oxygenated blood
🩸 2. Movement of Blood Through the Heart
Step-by-Step Flow:
Deoxygenated blood enters right atrium via vena cava
Blood passes through tricuspid valve → right ventricle
Right ventricle pumps blood through pulmonary artery → lungs (oxygenated)
Oxygenated blood returns via pulmonary vein → left atrium
Blood passes through bicuspid/mitral valve → left ventricle
Left ventricle pumps blood through aorta → whole body
Mnemonic: RA → RV → Lungs → LA → LV → Body
🩺 3. Types of Blood Vessels
Type | Function | Key Features |
|---|---|---|
Arteries | Carry blood away from the heart (usually oxygenated) | Thick, elastic walls; narrow lumen; high pressure |
Veins | Carry blood towards the heart (usually deoxygenated) | Thin walls; valves to prevent backflow; wide lumen; low pressure |
Capillaries | Exchange materials with tissues | Very thin walls (1 cell thick); narrow lumen; slow blood flow for exchange |
Key Tip: Capillaries connect arteries to veins and allow diffusion of oxygen, CO₂, nutrients, and waste
🔗 Big Links
Heart structure → ensures unidirectional blood flow
Blood movement → linked to oxygenation and deoxygenation
Blood vessels → structure matches function (pressure, flow, exchange)
⭐ Exam Tips
Label heart diagrams with atria, ventricles, valves, arteries, veins
When describing blood flow, use right/left side and deoxygenated/oxygenated
Compare arteries, veins, capillaries with thickness, lumen, valves, pressure