ICSE Class 9 Biology | 13. Skin: The Jack-of-all-Trades by Pavan | Learn Smarter
K12 Students

Academics

AI-Powered learning for Grades 8–12, aligned with major Indian and international curricula.

Professionals

Professional Courses

Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.

Games

Interactive Games

Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.

Typing
Memory
Math
English Adventures
Knowledge
13. Skin: The Jack-of-all-Trades

The skin is the largest organ in the human body, serving multiple critical functions including protection, regulation of body temperature, and sensation. It consists of three main layers: the epidermis, dermis, and hypodermis, each serving distinct roles from pigmentation to insulation. The chapter also outlines the various skin appendages such as hair and nails, and emphasizes the importance of skin care for maintaining health.

Enroll to start learning

You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.

Sections

  • 13

    Skin: The Jack-Of-All-Trades

    The skin is the largest organ of the human body, functioning as a protective barrier and regulating various essential bodily processes.

    Learning Practice

  • 13.1

    Introduction

    The skin is the body's largest organ and performs critical functions.

    Learning Practice

  • 13.2

    Structure Of The Skin

    The skin consists of three primary layers: the epidermis, dermis, and hypodermis, each serving essential functions.

    Learning Practice

  • 13.2.1

    Epidermis

    The epidermis is the outermost layer of the skin that provides protective functions and contains melanin pigment.

    Learning Practice

  • 13.2.2

    Dermis

    The dermis is the middle layer of the skin that consists of essential structures like blood vessels, nerves, and glands, playing a vital role in skin function.

    Learning Practice

  • 13.2.3

    Hypodermis (Subcutaneous Layer)

    The hypodermis, also known as the subcutaneous layer, is the innermost layer of the skin that provides insulation and cushioning through fat and connective tissue.

    Learning Practice

  • 13.3

    Functions Of The Skin

    The skin performs vital functions including protection, sensation, temperature regulation, excretion, Vitamin D synthesis, and storage.

    Learning Practice

  • 13.3.1

    Protection

    The skin, acting as a protective barrier, defends the body against physical injuries and microbes while also preventing water loss.

    Learning Practice

  • 13.3.2

    Regulation Of Body Temperature

    This section explains how the skin regulates body temperature through sweat production and blood vessel activation.

    Learning Practice

  • 13.3.3

    Sensation

    The sensation function of the skin involves detecting touch, pressure, pain, and temperature through various nerve endings.

    Learning Practice

  • 13.3.4

    Excretion

    The excretion function of the skin involves the elimination of waste products through sweat glands.

    Learning Practice

  • 13.3.5

    Synthesis Of Vitamin D

    The synthesis of Vitamin D occurs in the skin when exposed to sunlight, highlighting its vital role in health.

    Learning Practice

  • 13.3.6

    Storage

    The skin serves as a storage site for fat, which provides energy reserves and insulation.

    Learning Practice

  • 13.4

    Skin Appendages

    This section discusses skin appendages, including hair, nails, sweat glands, and sebaceous glands, and their functions.

    Learning Practice

  • 13.5

    Care Of Skin

    This section emphasizes the importance of maintaining skin health through cleanliness, sun protection, diet, and avoidance of harmful substances.

    Learning Practice

References

b9-13.pdf

Class Notes

Memorization

What we have learnt

  • The skin serves as a barrie...
  • It plays a vital role in re...
  • Skin is involved in sensati...

Final Test

Revision Tests