What is the total volume of blood in an adult human body?

Last Updated: 26 Jun 2026

What is the total volume of blood in an adult human body? This question examines a fundamental concept of human anatomy, physiology, health, nutrition, disease, or body regulation that frequently appears in SSC CGL General Science. The human body works through coordinated organ systems. Questions may also test blood components, vitamins, glands, sense organs, communicable diseases, and deficiency disorders. Restate the question in your own words, predict the answer before checking the options, and confirm that the explanation and correct-option field both point to 5-6 litres.

A2-3 litres

B4-5 litres

C5-6 litres

D8-9 litres

Correct Answer: 5-6 litresYour Answer: C

Explanation

tomy, physiology, blood, hormones, vitamins, immunity, pathogens, or disease. Therefore option C, 5-6 litres, is factually consistent with the stem, the marked correct index, and the explanation.✅ Correct Answer: C — 5-6 litres An average adult human body contains approximately 5 to 6 litres of blood. This accounts for about 7-8% of total body weight. Blood consists of plasma (55%), red blood cells (45%), and small amounts of WBCs and platelets. Blood volume can vary based on body size, age, and gender. 2-3 litres — This is too low; 2-3 litres would indicate severe blood loss (hemorrhage). 4-5 litres — Close but not the standard value; the average is 5-6 litres for adults. 8-9 litres — This is too high; no healthy adult has 8-9 litres of blood normally. 📝 Important Note: Normal adult blood volume = 5-6 litres (men: ~5.5L, women: ~4.5L). Blood makes up ~8% of body weight. A donation of ~450 ml is safe as the body replenishes it quickly. This is a standard SSC CGL factual question about human biology.

Important Notes

Read the complete stem and identify the exact demand: organ, gland, hormone, cell, tissue, nutrient, enzyme, pathogen, vector, deficiency disease, body fluid, or physiological function.
2-3 litres, 4-5 litres, 8-9 litres are eliminated here because none satisfies the precise requirement of the stem. Practising the reason for each rejection is more reliable than memorising only the correct choice.
Numerical biological facts often vary with age, sex, body size, and reference range. Use the standard approximate value expected in school-level competitive examinations and retain its unit.

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FAQ

SSC CGL Human Body FAQs

Common questions and clear answers for this topic.

Which body systems are most important for SSC CGL preparation?

The digestive, circulatory, nervous, and skeletal systems appear most frequently, along with sensory organs and basic endocrine functions.

How many bones are there in the human body, and is this commonly asked?

Yes, the human body has 206 bones, and questions about the largest, smallest, and total bone count appear fairly often.

What kind of blood-related questions come up in SSC CGL?

Questions usually cover blood group compatibility, the role of platelets in clotting, and basic facts about blood pressure and heart function.

Do I need detailed biochemistry knowledge for the human body section?

No, most questions focus on what each organ does and why, rather than the detailed biochemical processes behind it.

How can I retain human body facts more effectively for the exam?

Linking facts to real-life observations, like why pulse is checked at the wrist, makes them easier to recall than memorizing textbook lines.

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