Question

Skin, hairs and nails are an integral part of which of the following systems?
A) Integumentary
B) Endocrine
C) Digestive
D) lymphatic

Answer 1

Hint: Skin, nails and hairs are the parts of our body that are externally exposed to the environment. The major function of these parts is the protection of the underlying tissues present inside our body. They belong to the system whose primary role is defence and protection.

Complete answer:
The human body is made up of several organs which constitute the organ system. Every system is made up of different organs which work together for carrying out specific physiological processes like excretion, digestion, respiration etc.

Let us discuss the role of different systems and the organs it is made up of.
Integumentary system- It comprises nails, skin hairs, sebaceous glands, subcutaneous tissues. The chief role of this system is the protection of the internal body. The skin is the largest organ in our body. It is also known as the first line of defence. It protects the internal organs from the harmful sun rays, foreign particles and also helps in maintaining temperature. The hairs are present all over the body, nasal cavity and protect the internal organs from dust particles. Nails protect the fingers and also enhance sensation in the fingertips.

Endocrine- This system comprises several glands like the hypothalamus, pancreas, thyroid etc which secrete hormones. They secrete the hormones directly into the bloodstream. These hormones control the entire physiology of our body.

Digestive- This system comprises the mouth, stomach, intestines, liver, pancreas etc. The main role of this system is the breakdown of the food into several nutrients required for the growth and development of our body. These organs secrete digestive juices to break down food. The undigested food is eliminated from the body in the form of faeces.

Lymphatic- This system comprises tissues, organs and nerves which help in circulating lymph in our system. The main function of the lymphatic system is to transport fat and also contains cells that bring about immune responses.

Therefore the correct answer is option ‘A’.

Note: Lymph contains cells called lymphocytes. These cells are important for the immune system as they protect the body from toxins and pathogens. The T cells and B cells are important in destroying the foreign invaders and also apoptosis of the worn-out cells.