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Human Body Systems - TNPSC MCQ Practice Quiz (Digestive, Circulatory, Respiratory & Nervous)

Practice 12 TNPSC-style Multiple Choice Questions on Human Body Systems covering the digestive, circulatory, respiratory and nervous systems based on the Samacheer Kalvi Science syllabus. Covers organ functions, blood circulation, breathing mechanism, brain parts and commonly confused concepts for TNPSC Group 1, Group 2, Group 4 and VAO exams.

Curated by: Janani — Content Editor, TNCareerHub

Expert-reviewed questions

8 attempts so far

23 Aug 2026

Updated: 23 Aug 2026

English தமிழ்

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Q1 Which finger-like structures in the small intestine increase the surface area available for absorption of nutrients?

Easy

A. Alveoli B. Villi C. Nephrons D. Bronchioles

Q2 Which of the following correctly describes the pulmonary artery?

Medium

A. It carries oxygen-rich blood from the lungs to the heart B. It carries oxygen-poor blood from the heart to the lungs C. It carries oxygen-rich blood from the heart to the body D. It carries oxygen-poor blood from the body to the heart

Q3 Which part of the brain is mainly responsible for maintaining balance, posture and coordination of muscular movements?

Medium

A. Cerebrum B. Cerebellum C. Medulla oblongata D. Spinal cord

Q4 Consider the following statements: 1. Arteries generally carry blood away from the heart. 2. Veins generally carry blood towards the heart. 3. Pulmonary veins carry oxygen-poor blood. Which of the above statements is/are correct?

Hard

A. 1 only B. 1 and 2 only C. 2 and 3 only D. 1, 2 and 3

Q5 Which sequence correctly represents the normal pathway of air during breathing?

Medium

A. Nose → Trachea → Pharynx → Larynx → Alveoli B. Nose → Pharynx → Larynx → Trachea → Bronchi → Alveoli C. Nose → Larynx → Pharynx → Bronchi → Alveoli D. Nose → Oesophagus → Trachea → Bronchi → Alveoli

Q6 Which statement about bile is correct?

Medium

A. It is produced by the pancreas and digests carbohydrates B. It is itself a digestive enzyme C. It is produced by the liver and helps emulsify fats D. It is produced by the stomach and digests proteins

Q7 The structural and functional unit of the nervous system is the:

Easy

A. Nephron B. Neuron C. Alveolus D. Platelet

Q8 Which blood component is primarily responsible for blood clotting and preventing excessive blood loss after an injury?

Easy

A. Red blood cells B. White blood cells C. Platelets D. Plasma proteins only

Q9 How many chambers does the human heart have, and what are they called?

Easy

A. Two chambers - left and right atrium B. Three chambers - two atria and one ventricle C. Four chambers - right atrium, right ventricle, left atrium, left ventricle D. Four chambers - two ventricles and two aortas

Q10 Which enzyme present in saliva begins the digestion of starch in the mouth?

Medium

A. Pepsin B. Salivary amylase C. Trypsin D. Lipase

Q11 What is the key difference between breathing and respiration?

Hard

A. Breathing and respiration are the same biological process B. Breathing is the physical movement of air into and out of the lungs, while respiration is the biochemical process by which cells release energy from nutrients C. Breathing occurs only in plants, respiration only in animals D. Breathing happens at the cellular level, respiration involves the lungs only

Q12 Which part of the brainstem regulates involuntary functions such as breathing rate and heart activity?

Hard

A. Cerebrum B. Cerebellum C. Medulla oblongata D. Hypothalamus

Human Body Systems - TNPSC MCQ Practice Quiz (Digestive, Circulatory, Respiratory & Nervous)

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