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CSS - PMS - CCE - PCS - General Science Practice

Human Organs – Major Organs, Functions, Systems & Important Facts MCQs

Study the major organs of the human body, their locations, functions and related organ systems. This topic covers the heart, brain, lungs, liver, kidneys, stomach, intestines, pancreas, spleen, skin and other important organs. Specially prepared for CSS, PMS, CCE, PCS, FPSC, PPSC and General Science competitive exams with exam-focused facts and MCQs.

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Human Organs – Major Organs, Functions, Systems & Important Facts

Human Organs – Major Organs, Functions, Systems & Important Facts MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Organs
Which enzyme begins protein digestion in the stomach?
A. Amylase
B. Pepsin
C. Lipase only
D. Trypsin
Read Theory
Correct Answer: B
Pepsin is activated in the acidic stomach and begins protein digestion.
CSS - PMS - CCE - PCS - General Science Organs
Which organ produces hydrochloric acid for digestion?
A. Stomach
B. Liver
C. Pancreas
D. Large intestine
Read Theory
Correct Answer: A
Parietal cells in the stomach secrete hydrochloric acid.
CSS - PMS - CCE - PCS - General Science Organs
Which organ is a J-shaped muscular sac in the upper abdomen?
A. Stomach
B. Spleen
C. Pancreas
D. Bladder
Read Theory
Correct Answer: A
The stomach is a muscular digestive organ located mainly in the upper left abdomen.
CSS - PMS - CCE - PCS - General Science Organs
Which lung is slightly smaller because of the position of the heart?
A. Right lung
B. Left lung
C. Both lungs equal
D. Neither lung
Read Theory
Correct Answer: B
The left lung is smaller and has a cardiac notch.
CSS - PMS - CCE - PCS - General Science Organs
The trachea divides into which structures?
A. Ureters
B. Main bronchi
C. Pulmonary veins
D. Alveolar ducts directly
Read Theory
Correct Answer: B
The trachea bifurcates into right and left main bronchi.
CSS - PMS - CCE - PCS - General Science Organs
Which membrane covers the lungs?
A. Pericardium
B. Pleura
C. Peritoneum
D. Meninges
Read Theory
Correct Answer: B
The pleura is a double-layered membrane associated with the lungs and thoracic wall.
CSS - PMS - CCE - PCS - General Science Organs
Which muscle is the principal muscle of quiet inspiration?
A. Diaphragm
B. Biceps
C. Rectus abdominis
D. Trapezius
Read Theory
Correct Answer: A
Contraction of the diaphragm enlarges the thoracic cavity and draws air into the lungs.
CSS - PMS - CCE - PCS - General Science Organs
How many lobes does the left lung normally have?
A. One
B. Two
C. Three
D. Four
Read Theory
Correct Answer: B
The left lung has two lobes: superior and inferior.
CSS - PMS - CCE - PCS - General Science Organs
Which lung has three lobes?
A. Left lung only
B. Right lung only
C. Both lungs
D. Neither lung
Read Theory
Correct Answer: B
The right lung has three lobes; the left lung has two to accommodate the heart.
CSS - PMS - CCE - PCS - General Science Organs
Where does gas exchange primarily occur in the lungs?
A. Bronchi
B. Alveoli
C. Trachea
D. Pleura
Read Theory
Correct Answer: B
Alveoli provide a thin, large surface for exchange of oxygen and carbon dioxide.
CSS - PMS - CCE - PCS - General Science Organs
Which structure is commonly called the windpipe?
A. Esophagus
B. Trachea
C. Pharynx
D. Ureter
Read Theory
Correct Answer: B
The trachea conducts air from the larynx toward the bronchi.
CSS - PMS - CCE - PCS - General Science Organs
Which membrane surrounds the heart?
A. Pleura
B. Pericardium
C. Peritoneum
D. Meninges
Read Theory
Correct Answer: B
The pericardium is the sac surrounding the heart.
CSS - PMS - CCE - PCS - General Science Organs
The heart is located mainly in which body cavity?
A. Abdominal cavity
B. Thoracic cavity
C. Pelvic cavity
D. Cranial cavity
Read Theory
Correct Answer: B
The heart lies in the mediastinum within the thoracic cavity.
CSS - PMS - CCE - PCS - General Science Organs
Which vessels supply the heart muscle itself with oxygenated blood?
A. Pulmonary veins
B. Coronary arteries
C. Hepatic veins
D. Renal arteries
Read Theory
Correct Answer: B
The coronary arteries supply the myocardium.
CSS - PMS - CCE - PCS - General Science Organs
Which blood vessels carry oxygenated blood from the lungs to the heart?
A. Pulmonary arteries
B. Pulmonary veins
C. Venae cavae
D. Coronary arteries
Read Theory
Correct Answer: B
Pulmonary veins carry oxygenated blood to the left atrium.
CSS - PMS - CCE - PCS - General Science Organs
Which blood vessel carries deoxygenated blood from the heart to the lungs?
A. Pulmonary vein
B. Pulmonary artery
C. Aorta
D. Vena cava
Read Theory
Correct Answer: B
The pulmonary artery is an exception among arteries because it carries deoxygenated blood.
CSS - PMS - CCE - PCS - General Science Organs
Which is the largest artery in the human body?
A. Pulmonary artery
B. Aorta
C. Carotid artery
D. Femoral artery
Read Theory
Correct Answer: B
The aorta is the largest artery and carries blood from the left ventricle to the body.
CSS - PMS - CCE - PCS - General Science Organs
Which valve lies between the right atrium and right ventricle?
A. Mitral valve
B. Tricuspid valve
C. Aortic valve
D. Pulmonary valve
Read Theory
Correct Answer: B
The tricuspid valve separates the right atrium from the right ventricle.
CSS - PMS - CCE - PCS - General Science Organs
Which valve lies between the left atrium and left ventricle?
A. Tricuspid valve
B. Mitral valve
C. Pulmonary valve
D. Aortic valve
Read Theory
Correct Answer: B
The mitral, or bicuspid, valve separates the left atrium from the left ventricle.
CSS - PMS - CCE - PCS - General Science Organs
Which chamber pumps deoxygenated blood to the lungs?
A. Left ventricle
B. Right ventricle
C. Left atrium
D. Right atrium
Read Theory
Correct Answer: B
The right ventricle pumps deoxygenated blood through the pulmonary artery to the lungs.
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