Free practice › Class 11 › Biology › Chapter 15
Body Fluids and Circulation — NEET MCQs with answers
Chapter 15 covers the composition and functions of blood (plasma + formed elements) and lymph, the ABO and Rh blood group systems, coagulation, and the human circulatory system — including the four-chambered heart, cardiac cycle, ECG, double circulation, regulation of cardiac activity, and common circulatory disorders.
Topics in this chapter
- 15.1 Blood
- 15.2 Lymph (Tissue Fluid)
- 15.3 Circulatory Pathways
- 15.4 Double Circulation
- 15.5 Regulation of Cardiac Activity
- 15.6 Disorders of the Circulatory System
Free practice questions
The tissue fluid has the same mineral distribution as that in:
- A. Cerebrospinal fluid
- B. Urine
- C. Plasma
- D. Bile
Show answer
Answer: C — NCERT states that the interstitial (tissue) fluid 'has the same mineral distribution as that in plasma'.
NCERT Class 11 Biology Ch 15.2
Parasympathetic neural signals bring about a decrease in
- A. the number of nodal tissues
- B. the strength of ventricular contraction only
- C. the diameter of the medulla oblongata
- D. the rate of heart beat
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Answer: D — Parasympathetic signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
NCERT Class 11 Biology Ch 15
The P-wave of the ECG represents:
- A. The electrical excitation (depolarisation) of the atria, which leads to contraction of both the atria
- B. The repolarisation of the ventricles
- C. The repolarisation of the atria
- D. The depolarisation of the ventricles
Show answer
Answer: A — NCERT: 'The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria.'
NCERT Class 11 Biology Ch 15.3
Which of the following is a vein that carries oxygenated blood?
- A. Pulmonary vein
- B. Vena cava
- C. Venules of the systemic circuit
- D. Hepatic portal vein
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Answer: A — The pulmonary veins carry oxygenated blood from the lungs to the left atrium.
NCERT Class 11 Biology Ch 15.4
In the absence of calcium ions, blood coagulation would
- A. Be unaffected
- B. Be impaired
- C. Occur only inside blood vessels
- D. Proceed faster
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Answer: B — Calcium ions play a very important role in clotting, so their absence impairs coagulation.
NCERT Class 11 Biology Ch 15.1
A blood pressure reading of 150/95 recorded on repeated checks indicates that the person is
- A. having normal systolic but low diastolic pressure
- B. hypotensive
- C. normotensive
- D. hypertensive
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Answer: D — Repeated readings of 140/90 or higher indicate hypertension, and 150/95 exceeds that threshold on both values.
NCERT Class 11 Biology Ch 15
The inner lining of squamous endothelium in an artery or vein is called the:
- A. Tunica externa
- B. Tunica adventitia propria
- C. Tunica media
- D. Tunica intima
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Answer: D — Each artery and vein consists of three layers; the inner lining of squamous endothelium is the tunica intima.
NCERT Class 11 Biology Ch 15.4
Calculate the cardiac output for a stroke volume of 70 mL and a heart rate of 70 per minute.
- A. 5040 mL/min
- B. 4200 mL/min
- C. 4900 mL/min
- D. 5250 mL/min
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Answer: C — 70 × 70 = 4900 mL per minute.
NCERT Class 11 Biology Ch 15.3
Antibodies are defined in NCERT as
- A. Chemicals that induce immune response
- B. Iron containing complex proteins
- C. Proteins produced in response to antigens
- D. Cell fragments from megakaryocytes
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Answer: C — NCERT: antibodies (proteins produced in response to antigens).
NCERT Class 11 Biology Ch 15.1
The neural centre in the medulla oblongata influences the heart
- A. only through the parasympathetic component of the ANS
- B. directly, without any intervening nerves
- C. only through the sympathetic component of the ANS
- D. through both sympathetic and parasympathetic components of the ANS
Show answer
Answer: D — The medullary centre works through the ANS, whose sympathetic and parasympathetic components respectively increase and decrease cardiac activity.
NCERT Class 11 Biology Ch 15
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