Watch: [Understanding Your Body] Skin

⭐English subtitles available⭐

 

 

Which organ is the first to protect our body from the outside world?

 

Many people often think of white blood cells or lymph nodes when considering immune functions,

but the very first organ to perform immune defense is the skin.

 

Healthy skin functions as the body’s primary defense barrier,

preventing the entry of pathogens and protecting the body through its various sensory receptors.

 

Additionally, the skin helps strengthen bones by synthesizing vitamin D.

 

In this way, the skin is more than just an outer layer of beauty.

It is a hidden guardian that protects our health.

 

The skin is the largest organ of the body,

accounting for about 7% of total body weight, with a surface area of approximately 2m².

 

Taking a closer look, the skin is divided into the epidermis, dermis, and subcutaneous fat layers.

 

The epidermis is the outermost layer,

which continuously produces keratinocytes to protect the skin from external stimuli.

 

The dermis under the epidermis has an intricate structure.

 

The nerves within the dermis transmit sensations of pain, temperature, touch, and pressure,

enabling quick responses that protect our body.

 

Beneath the dermis lies the subcutaneous tissue,

where any excess energy from our food is stored in the form of fat.

 

This subcutaneous fat helps maintain body temperature

and can be broken down to provide energy in an emergency.

 

Nerves, hair follicles, sebaceous glands, and sweat glands within the dermis

are considered skin appendages.

 

The skin, along with these appendages, also plays a role in maintaining the body’s balance.

 

Hair follicles are found all over the body except for palms and soles,

and they form countless pores on the skin’s surface.

 

Inside each hair follicle, sebaceous glands are connected, secreting sebum through the pores.

This oily substance helps to prevent moisture evaporation from the skin and hair,

keeping them from becoming dry.

 

Sweat glands, which are particularly abundant on the palms, soles, armpits, and forehead,

help regulate body temperature by secreting sweat.

 

In addition, sweat from the palms increases grip when holding objects.

 

The number of sweat glands is predetermined from birth.

Younger children have a higher density of sweat glands per unit area,

resulting in them sweating more.

 

Skin diseases such as atopic dermatitis, psoriasis, eczema, or athlete’s foot

highlights just how important the skin is as a protective barrier.

 

To maintain healthy skin, it is important to have a balanced diet,

ensure adequate hydration and sleep, and engage in regular exercise to release sweat.

 

Additionally, paying attention to moisturizing and cleanliness is essential,

and excessive exposure to ultraviolet (UV) rays can lead to skin damage,

so it is important to use sunscreen thoroughly when going outdoors.