मानव शरीर के प्रमुख अंग तंत्र / Major Organ Systems of Human Body
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15 mins
Time
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10
Questions
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1
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मानव शरीर के प्रमुख अंग तंत्र / Major Organ Systems of Human Body — Questions with Answers
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with answers and explanations.
Q1.
Which enzyme is responsible for breaking down proteins in the stomach?
Pepsin
Trypsin
Amylase
Lipase
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Answer: A. Pepsin
Pepsin is the main proteolytic enzyme secreted by the stomach. It breaks down proteins into smaller peptides in the acidic environment of the stomach.
Q2.
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
Right atrium
Left ventricle
Right ventricle
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Answer: A. Left atrium
The left atrium receives oxygenated blood from the lungs through the pulmonary veins. This blood is then pumped to the left ventricle and then to the body.
Q3.
What is the functional unit of the kidney?
Nephron
Glomerulus
Bowman's capsule
Loop of Henle
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Answer: A. Nephron
Nephron is the basic functional unit of the kidney. Each kidney contains about 1 million nephrons that filter blood and produce urine.
Q4.
During inspiration, which muscle contracts to increase the chest cavity volume?
Diaphragm
Intercostal muscles
Abdominal muscles
Both A and B
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Answer: D. Both A and B
During inspiration, both the diaphragm and external intercostal muscles contract. The diaphragm flattens and intercostal muscles lift the ribs, increasing chest cavity volume.
Q5.
Which part of the brain controls voluntary motor movements?
Cerebrum
Cerebellum
Medulla oblongata
Hypothalamus
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Answer: A. Cerebrum
The cerebrum, specifically the motor cortex in the frontal lobe, controls voluntary motor movements. The cerebellum coordinates these movements.
Q6.
How many bones are present in an adult human skeleton?
206
208
210
270
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Answer: A. 206
An adult human skeleton has 206 bones. Babies are born with about 270 bones, but many fuse together as they grow, resulting in 206 bones in adulthood.
Q7.
Which hormone regulates blood glucose levels?
Insulin
Thyroxine
Adrenaline
Growth hormone
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Answer: A. Insulin
Insulin, produced by beta cells in the pancreas, regulates blood glucose levels by facilitating glucose uptake by cells and promoting glycogen storage.
Q8.
Gas exchange in the lungs occurs at which structure?
Bronchi
Bronchioles
Alveoli
Trachea
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Answer: C. Alveoli
Gas exchange occurs in the alveoli, which are tiny air sacs in the lungs. They provide a large surface area for efficient exchange of oxygen and carbon dioxide.
Q9.
Which valve prevents backflow of blood from the left ventricle to the left atrium?
Tricuspid valve
Bicuspid (Mitral) valve
Aortic valve
Pulmonary valve
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Answer: B. Bicuspid (Mitral) valve
The bicuspid or mitral valve is located between the left atrium and left ventricle. It prevents backflow of blood from the ventricle to the atrium during ventricular contraction.
Q10.
Which part of the nephron is primarily responsible for reabsorption of water?
Glomerulus
Proximal convoluted tubule
Loop of Henle
Collecting duct
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Answer: D. Collecting duct
The collecting duct is primarily responsible for water reabsorption, regulated by ADH (antidiuretic hormone). It fine-tunes urine concentration based on body's water needs.
