Correct option is D
The skin is the largest organ of the human body, both in terms of weight and surface area. It covers the entire body and serves many important functions:
Protection: Acts as a barrier to protect the body from physical damage, harmful microorganisms, and harmful UV rays from the sun.
Temperature regulation: Helps maintain body temperature through sweating and blood flow.
Sensation: Contains sensory receptors for pain, pressure, temperature, and touch.
Vitamin D synthesis: The skin plays a crucial role in producing vitamin D when exposed to sunlight.
The skin is made up of three layers:
Epidermis: The outermost layer, providing a waterproof barrier.
Dermis: The thick middle layer that contains connective tissue, hair follicles, and sweat glands.
Hypodermis: The deeper subcutaneous layer made of fat and connective tissue.
