Which human organ weighs about 1.4 kg and 0.85 litres of blood passes through it every minute?

Correct option is A

The correct answer is (a) Brain.
· The human brain weighs approximately 1.4 kg, and about 0.85 liters of blood passes through it every minute.
· This extensive blood supply is essential for delivering oxygen and nutrients and for removing metabolic waste.
Explanation of Other Options:
· Kidneys : Although kidneys filter blood (about 50 gallons daily), they weigh less than 1.4 kg and process blood, not receive 0.85 liters per minute directly.
· Heart : Weighs about 250–350 grams and pumps blood but does not match the weight and blood flow described.
· Lungs : Involved in oxygen exchange, not in processing blood flow in the way the brain does.
Key Facts About the Brain:
· The brain uses approximately 20% of the body's total oxygen supply.
· It receives blood via the carotid and vertebral arteries to support its complex functions.
· Even slight disruptions in blood flow can significantly impair brain function, highlighting the importance of its high perfusion rate.