Free Human Body and Health MCQs with Answers

441. Dead red blood corpuscles are stored in____________?

• A. Liver
• B. Spleen
• C. Kidney
• D. Heart

Explanation: The spleen filters blood and removes worn-out red blood cells, while recycling much of their iron. The liver also helps process their breakdown products, but the spleen is the main organ associated with their storage and removal.

442. Which human hormone is called love hormone?

• A. Oxytocin
• B. Melatonin
• C. Adrenalin
• D. Renin

Explanation: Oxytocin is associated with bonding, trust and childbirth, which is why it is popularly called the love or bonding hormone. Melatonin regulates sleep, while adrenaline supports the fight-or-flight response.

443. What is the body's natural or acquired ability to resist certain diseases?

• A. Immunity
• B. Endocrine
• C. Exocrine
• D. All of above

Explanation: Immunity is the body's ability to resist particular diseases through innate defenses or acquired immune responses. Endocrine and exocrine describe types of glands, not disease resistance.

444. The olfactory nerves affect what sense in brain?

• A. Smell
• B. Feel
• C. Touch
• D. Hear

Explanation: The olfactory nerves carry signals from receptors in the nose to the brain for the sense of smell. Touch and hearing use different sensory nerves and pathways.

445. Penicillin is used to fight what type of infections?

• A. Bacteria
• B. Viral
• C. Pneumonia
• D. Sepsis

Explanation: Penicillin is an antibiotic, so it acts against susceptible bacteria by interfering with their cell-wall formation. It does not treat viral infections, although some pneumonia and sepsis cases can be bacterial.

446. People with what blood type can give blood to anyone and are thus called universal donors?

• A. O-
• B. O
• C. AB+
• D. AB-

Explanation: O-negative red blood cells lack A, B and Rh-D antigens, reducing the risk of incompatibility when urgently transfused. Universal-donor status applies mainly to red-cell transfusions, not every type of blood product.

447. The average human body contains how many pints of blood?

• A. 3 to 5 pints
• B. 5 to 7 pints
• C. 7 to 8 pints
• D. 9 to 12 pints

Explanation: An average adult has roughly 4.5 to 6 litres of blood, which is about 9 to 12 US pints. The exact amount varies with body size, so option d gives the suitable range.

448. What is the medical term for low blood sugar?

• A. Hypoglycemia
• B. Lymphoblastic leukemia
• C. Pulmonary edema
• D. Diabetes mellitus

Explanation: Hypoglycemia means an abnormally low level of glucose in the blood, with symptoms such as sweating, shakiness and confusion. Diabetes mellitus usually refers to persistently high blood glucose rather than low blood sugar.

449. The protein content in wheat is approximately?

• A. 8%
• B. 6%
• C. 13%
• D. 17%

Explanation: Wheat grain commonly contains about 10 to 15 percent protein, with approximately 13 percent used as a standard estimate. The exact value changes among wheat varieties and growing conditions.

450. Tooth decay is caused by?

• A. Salt
• B. Sugar
• C. Calcium
• D. Formalin

Explanation: Sugar feeds oral bacteria, which produce acids that dissolve tooth enamel and begin decay. Sugar is therefore the relevant option, although bacteria and their acids are the direct agents of damage.