Body Fluids and Circulation
CBSE · Class 11 · Biology
Summary of Body Fluids and Circulation for CBSE Class 11 Biology. Key concepts, important points, and chapter overview.
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Overview
Blood and lymph are the main body fluids that transport substances in vertebrates. Blood is a special connective tissue with a fluid matrix called plasma and formed elements such as erythrocytes, leucocytes, and platelets. Lymph is a colourless tissue fluid that helps in transport, immunity, and abs
Key Concepts
Blood is a special connective tissue
Blood is a special connective tissue consisting of plasma and formed elements. It transports oxygen, nutrients, hormones, and wastes throughout the bo
Plasma is a straw
Plasma is a straw-coloured, viscous fluid that forms nearly 55% of blood. It contains 90-92% water, 6-8% proteins, minerals, glucose, amino acids, lip
Erythrocytes
Erythrocytes, leucocytes, and platelets are the formed elements of blood. They make up nearly 45% of blood.
RBCs are the most abundant blood
RBCs are the most abundant blood cells, biconcave in shape, and contain haemoglobin. They are formed in red bone marrow and are destroyed in the splee
WBCs are colourless
WBCs are colourless, nucleated cells without haemoglobin. They are grouped into granulocytes and agranulocytes. Neutrophils are most abundant, monocyt
Learning Objectives
- Understand the composition and functions of blood and plasma
- Identify the formed elements of blood and their roles
- Explain ABO and Rh blood group systems and their importance in transfusion
- Describe blood clotting and the role of platelets, thrombin, fibrinogen, and calcium ions
- Explain the formation and functions of lymph
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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