Free Human Body and Health MCQs with Answers

161. Which element has the most % in human body?

• A. Oxygen 65%
• B. Calcium 75%
• C. Hydrogen 10%
• D. Carbon 18%

Explanation: Oxygen is the most abundant element in the human body by mass, largely because it forms part of water and many organic compounds. It accounts for approximately 65% of body mass.

162. JAUNDICE is the disease of __________?

• A. Heart
• B. Liver
• C. Lungs
• D. Brain

Explanation: Jaundice causes yellowing of the skin and eyes when bilirubin accumulates in the blood, commonly because of liver disease or impaired bile flow. It is therefore primarily associated with the liver.

163. The importance of perspiration is to ___________?

• A. Eliminate body odours
• B. Improve the general health
• C. Open the pores in the skin
• D. Regulate body temperature

Explanation: Perspiration cools the body when sweat evaporates from the skin, removing heat from its surface. Eliminating odour is not its main physiological function.

164. Water soluble vitamins are released by__________?

• A. Sweat
• B. Tears
• C. Injections
• D. Urine

Explanation: Water-soluble vitamins, especially excess vitamin B and vitamin C, are not stored extensively and are removed mainly through urine. Fat-soluble vitamins are more likely to accumulate in body tissues.

165. Which hormone is necessary for the production of milk in the mother's breast?

• A. FSH
• B. prolactin
• C. A.D.H.
• D. Oxytocin

Explanation: Prolactin stimulates the mammary glands to produce milk after childbirth. Oxytocin causes milk ejection, so confusing these two hormones is the common trap.

166. Nowadays Milk is not considered balanced diet because it is lacking in ___________?

• A. Magnesium and Vitamin D
• B. Iron and Vitamin B
• C. Iron and Vitamin C
• D. calcium and vitamin C

Explanation: Milk supplies protein, fat and calcium but is naturally poor in iron and vitamin C. Therefore, milk alone is not nutritionally complete despite being an important food.

167. Which of the following is a tissue?

• A. Blood
• B. Lungs
• C. Kidney
• D. pancreas

Explanation: Blood is a connective tissue because its cells are suspended in a liquid matrix called plasma and it transports materials throughout the body. Lungs, kidneys and the pancreas are organs made of several tissue types.

168. Main use of salt in diet is to : ___________?

• A. ease the process of cooking
• B. increase the taste
• C. produce small amount of hydrochloric acid required for digestion
• D. inclease solubility of food particles in water

Explanation: Chloride from dietary salt helps form hydrochloric acid in the stomach, which is needed for digestion. Increasing taste is a culinary benefit, but the question asks for its physiological role.

169. Erythrocyte is another name for a ___________?

• A. white blood Cells
• B. Platelet
• C. Red Blood cells
• D. Plasma

Explanation: Erythrocytes are red blood cells, named from Greek words meaning red and cell. They contain haemoglobin and transport oxygen through the blood.

170. The blood pressure is denoted as following?

• A. Systolic Pressure / Diastolic Pressure
• B. Diastolic Pressure / Systolic Pressure
• C. Venous Pressure / Systolic Pressure
• D. Systolic Pressure / Pulse Pressure

Explanation: Blood pressure is written as systolic pressure over diastolic pressure, such as 120/80 mmHg. Systolic pressure occurs during heart contraction, while diastolic pressure occurs during relaxation.