What percentage of plasma is water?

Last Updated: 26 Jun 2026

What percentage of plasma is water? The digestive system processes food and absorbs nutrients; the respiratory system exchanges oxygen and carbon dioxide; the circulatory system transports gases, nutrients, hormones, and wastes; the excretory system maintains water, salt, and acid–base balance; the nervous and endocrine systems coordinate responses; and the skeletal, muscular, immune, and reproductive systems perform specialised roles.

A55%

B70%

C90-92%

D99%

Correct Answer: 90-92%Your Answer: C

Explanation

Blood plasma is approximately 90-92% water. Plasma makes up about 55% of total blood volume. 55% — 55% is actually the percentage of plasma in total blood volume (not water content in plasma). 70% — 70% is approximately the water content of the entire human body, not specifically plasma. 99% — 99% is close to the water content of some body fluids like saliva/urine, but not plasma. 📝 Important Note: Blood = Plasma (55%) + Formed elements (45% RBCs, WBCs, platelets). Plasma = 90-92% water + 8-10% proteins and other substances. Serum = Plasma without clotting factors. Fibrinogen in plasma helps in blood clotting.

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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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What percentage of plasma is water?

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