Explanation

Calcium is the most abundant mineral in the human body,

calcium makes up 1.5 to 2% of the total body weight.

Approximately 1,200 g of calcium is present in the body of an adult human

more than 99% of that amount is found in bones.

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ND11-12-2022

Explanation

Explanation

The human eye has peak sensitivity in the green-yellow region of the visible spectrum (around 555 nm wavelength).

This is due to the way the photoreceptor cells (cones) in the retina respond to different wavelengths of light.

Explanation

• A normal, healthy human breathes about 11,000 litres of air in a day
• breathe air by the process of breathing                                               

Additional information:

• The average adult at rest inhales and exhales something like 7 or 8 liters of air per minute.

Last updated question by NA on 28 April 2026

Explanation

The cochlea is a part of the human ear, not the eye.

Explanation

• Skin is the largest organ of our body.
• The skin is made up of three main layers: the epidermis, dermis and subcutis.
• It covering approximately 22 square feet (2 square meters) in adults.

Explanation

• Males: 18 inches (45 cm)
• Females: 17 inches (43 cm)

• Cylindrical bundle of nerves.
• Extends from the brain through the backbone.

Function:

• Relays information between the brain and body.
• Part of the central nervous system (with the brain).

Explanation

The human brain is similar to a computer's central processing unit (CPU).

The CPU processes instructions from the keyboard, mouse, and computer programs, and sends commands to other components in the computer.

Similarly, the brain regulates the functioning of all parts of the body.

Explanation

Explanation

A primary function of the kidneys is Regulation of fluids, electrolytes and acid-base balance

1. Kidneys maintain water balance.

2. They regulate electrolytes (Na⁺, K⁺, Cl⁻).

3. Control blood pH via acid-base regulation.

4. Remove metabolic wastes from blood.

5. Essential for homeostasis.

   
   

   Last updated question01  March 2026