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The statement is incorrect because plasma is a viscous, straw-coloured fluid. Its viscosity is mainly due to dissolved plasma proteins such as albumin, globulins and fibrinogen. Plasma makes up about 55% of the total blood volume.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Albumin maintains osmotic pressure, ensuring proper fluid balance between blood and tissues.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood Groups - ABO Rh System and Coagulation
Leukocytes (WBCs) are involved in immune defense, while oxygen transport is carried out by erythrocytes (RBCs).
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood - Plasma and Formed Elements
Phoronid circulatory physiology includes red blood corpuscles containing hemoglobin enabling oxygen storage and transport in often hypoxic burrow environments. Hemoglobin located inside nucleated corpuscles circulating within vascular lumen, not dissolved plasma as in some annelids, giving blood red coloration and high oxygen affinity. Corpuscular packaging improves carrying capacity and buffers pH. Trait parallels vertebrate erythrocytes and some polychaete blood cells considered convergent acquisition in lophophorate lineage enhancing gas exchange. Quantity and binding properties vary betwee
Ref: Ruppert et al., Invertebrate Zoology, Chapter 16: Phoronida blood corpuscles hemoglobin
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