Class IX Practical: Animal Life - Organ Study (Lung and Skin)

Objective

To identify and understand the basic structure and function of the human lung and skin using specimens, models, or charts.

Guidelines

1. Lung

1. Identification: Observe the external features of a lung specimen/model/chart (e.g., color, texture, lobes).
2. Internal Structure (Brief): Understand the pathway of air: trachea -> bronchi -> bronchioles -> alveoli. Identify the pleura.
3. Function: Understand its primary role in gaseous exchange (oxygen intake, carbon dioxide release).
4. Drawing: Draw a neat, labeled diagram of the human lung and its associated air passages.

2. Skin

1. Identification: Observe a model or chart of the human skin.
2. Layers: Identify the main layers: epidermis, dermis, and subcutaneous tissue (hypodermis).
3. Associated Structures: Locate hair follicles, sebaceous glands, sweat glands, nerve endings, and blood vessels.
4. Function: Understand its multiple roles: protection, temperature regulation, sensation, excretion, vitamin D synthesis.
5. Drawing: Draw a neat, labeled diagram of a cross-section of the human skin.

Expected Outcome

Ability to identify and label the key parts of the human lung and skin, and understand their basic anatomical organization and physiological functions.