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NEET UG Body Fluids and Circulation — practice questions — page 2

Explore 96 free Body Fluids and Circulation questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Body Fluids and Circulation questions and exercises with answers

Showing questions 31–60 of 96.

The oxygen-carrying pigment in red blood cells isRead the answer and worked solution →A person with blood group O isRead the answer and worked solution →The insoluble protein meshwork in a blood clot is made ofRead the answer and worked solution →The natural pacemaker of the human heart is theRead the answer and worked solution →Stroke volume 70 mL, heart rate 80 bpm. Cardiac output isRead the answer and worked solution →A typical normal blood pressure for a healthy adult isRead the answer and worked solution →The lifespan of a human red blood cell (erythrocyte) is approximately:Read the answer and worked solution →A person with blood group AB is considered:Read the answer and worked solution →The most ABUNDANT type of WBC in human blood is:Read the answer and worked solution →The mammalian heart has how many chambers?Read the answer and worked solution →In a typical ECG, the QRS complex represents:Read the answer and worked solution →A normal resting blood pressure is approximately:Read the answer and worked solution →Match each blood vessel type to the direction it carries blood.Read the answer and worked solution →NEET · Biology · Blood Component ↔ FunctionRead the answer and worked solution →NEET · Biology · Blood Flow Through the HeartRead the answer and worked solution →Sort the ABO blood groupsRead the answer and worked solution →Order one cardiac cycleRead the answer and worked solution →Call every blood componentRead the answer and worked solution →Pair each trace with its eventRead the answer and worked solution →Tap the bigger blood valueRead the answer and worked solution →Plasma makes up roughly what share of human blood?Read the answer and worked solution →Water accounts for what portion of blood plasma?Read the answer and worked solution →Which plasma protein is chiefly needed for blood clotting?Read the answer and worked solution →Which plasma proteins mainly help maintain osmotic balance?Read the answer and worked solution →Plasma globulins are primarily involved in:Read the answer and worked solution →The average RBC count in a healthy adult man is about:Read the answer and worked solution →In adult humans, red blood cells are formed in the:Read the answer and worked solution →Red blood cells of most mammals are best described as:Read the answer and worked solution →Which organ is known as the graveyard of RBCs?Read the answer and worked solution →The total leucocyte count of human blood averages:Read the answer and worked solution →

Worked practice questions

The oxygen-carrying pigment in red blood cells is

  1. chlorophyll
  2. haemoglobin
  3. myoglobin
  4. haematin
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Correct answer: B. haemoglobin

Haemoglobin — iron-containing protein in RBCs. Binds O₂ in lungs, releases it in tissues. Myoglobin is the related muscle protein that stores O₂.

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A person with blood group O is

  1. universal recipient
  2. universal donor
  3. incompatible with all groups
  4. of genotype I^A I^B
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Correct answer: B. universal donor

Group O has no A or B antigens — can donate to anyone. Cannot accept any non-O blood, because O serum has both anti-A and anti-B antibodies. Universal recipient is AB.

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The insoluble protein meshwork in a blood clot is made of

  1. albumin
  2. globulin
  3. fibrin
  4. haemoglobin
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Correct answer: C. fibrin

Soluble fibrinogen → insoluble fibrin (via thrombin). Fibrin threads weave a mesh trapping blood cells, forming the clot.

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