Q1
How many chambers does the human heart have?
AFour
BTwo
CThree
DSix
ICSEClass 10 (ICSE)BiologyCh 8 · Topic 1
The Circulatory System
The human circulatory system, comprising the heart, blood vessels, and blood, transports oxygen, nutrients, and waste throughout the body.
Core concept
The heart has four chambers (two atria, two ventricles) and pumps blood through a double circulation system - pulmonary and systemic circuits.
How it works
Arteries carry oxygenated blood away from the heart (except the pulmonary artery), while veins carry blood towards the heart.
Why it matters
Blood consists of plasma, red blood cells (carrying oxygen via haemoglobin), white blood cells (immunity), and platelets (clotting).
Key detail
The circulatory system also plays a role in regulating body temperature and distributing hormones throughout the body.
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• Heart: 4 chambers (2 atria, 2 ventricles).
• Double circulation: pulmonary and systemic circuits.
• Arteries carry blood away from heart (usually oxygenated).
• Veins carry blood towards heart.
• Blood: plasma, RBCs, WBCs, platelets.
• RBCs carry oxygen via haemoglobin.
• WBCs provide immunity; platelets aid clotting.
• System also regulates temperature, distributes hormones.