Question

Which of the following is not a function of the skin?
(a) Calcium Production
(b) Protection
(c) Immunity
(d) Vitamin D synthesis

Answer 1

Hint: This is the most plentiful mineral found in our body. Most of it is contained in the teeth and bones. The rest of it is present in nerve cells, body tissues, blood, and other body fluids.

Complete answer:
Skin is the layer of usually soft, flexible outer tissue that covers the body of a vertebrate. It has three main functions: protection, regulation, and sensation. It is not involved in calcium production. Bone tissue serves as a reservoir and source for these critical metabolic needs through the process of bone remodeling. Calcium metabolism is regulated in large part by the parathyroid hormone (PTH)-vitamin D endocrine system, which is characterized by a series of homeostatic feedback loops.
Consequently, it protects from mechanical impacts and pressure, variations in temperature, micro- organisms, radiation, and chemicals.

Additional information:
- The skin is made up of three layers. The outermost is the epidermis. keratinocytes form many layers that always grow outwards as the exterior cells die and break away.
- The epidermis is joined to a deeper skin layer below, known as the dermis, which gives skin its power and flexibility thanks to fibers of collagen and elastin.
- Blood vessels here help to regulate body temperature by increasing blood flow to the skin to allow heat to escape, or by restricting the flow when it's cold.
- The dermis houses hair follicles and glands with ducts that pass up through the skin.
- Sweat glands bring down internal temperature through sudation while ridding the body of the waste fluids urea and lactate.
- Sebaceous glands secrete oil- like sebum for lubricating the hair and skin.

So, the correct answer is calcium production.

Note:
1. Although the synthesis of Vitamin D is a function of the skin, however, acting as the front layer of defense and protecting our bodies against pathogens and other compromises are the primary function of the skin.
2. VitaminD3 (cholecalciferol) is synthesized in the human skin from 7- dehydrocholesterol upon exposure to ultraviolet- B (UVB) radiation from sunlight. It can also be obtained from dietary sources.
3. There are separate receptors for heat, cold, touch, and pain in our skin Damage to these nerve cells is known as neuropathy, which results in a loss of sensation in the affected areas.