Red Blood Cells: Structure and Function — NEET Biology
✅ Asked in NEET 2022Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in blood. A healthy adult man has, on an average, 5 millions to 5.5 millions of RBCs mm-3 of blood. RBCs are formed in the red bone marrow in the adults. RBCs are devoid of nucleus in most of the mammals and are biconcave in shape. They have a red coloured, iron containing complex protein called haemoglobin, hence the colour and name of these cells. A healthy individual has 12-16 gms of haemoglobin in every 100 ml of blood. These molecules play a significant role in transport of respiratory gases. RBCs have an average life span of 120 days after which they are destroyed in the spleen (graveyard of RBCs).
NTA tests your knowledge of RBC characteristics: count (5-5.5 million/mm³), shape (biconcave), location of formation (red bone marrow), and their key function in gas transport via hemoglobin. Students often confuse where RBCs are formed (bone marrow, not spleen) and mistake the spleen as their birthplace instead of their graveyard. The critical point: RBCs lack a nucleus in mammals, giving them their characteristic shape and allowing hemoglobin storage. Remember the 120-day lifespan and hemoglobin content (12-16 gms/100ml blood) as quantitative facts NTA loves. Since RBCs are the most abundant blood cells, understanding their properties is fundamental to circulatory system questions.
This paragraph was tested 2 times in NEET.
Arrange the following formed elements in the decreasing order of their abundance in blood in humans:[NEET 2022 Phase 2] (a) Platelets (b) Neutrophils (c) Erythrocytes (d) Eosinophils (e) Monocytes
Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature? (NEET 2017)
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.