Cells Within Multicellular Bodies

Introduction to Multicellular Organisms

Multicellular organisms are made up of many cells. These cells work together to perform various functions necessary for the organism's survival. In multicellular organisms, cells are specialized and organized into groups called tissues.

What Are Tissues?

A tissue is a group of similar cells that work together to perform a specific function. In multicellular organisms, different tissues combine to form organs, which then form organ systems.

• Plant Tissues: Examples include xylem and phloem, which are involved in transport within plants.
• Animal Tissues: Examples include muscle tissue, nervous tissue, and epithelial tissue.

Types of Animal Tissues

• Epithelial Tissue: Covers body surfaces and lines body cavities.
• Connective Tissue: Supports and binds other tissues. Examples include bone and blood.
• Muscle Tissue: Responsible for movement. Types include skeletal, cardiac, and smooth muscle.
• Nervous Tissue: Transmits signals throughout the body.

Types of Plant Tissues

• Meristematic Tissue: Responsible for plant growth.
• Dermal Tissue: Protects the plant.
• Vascular Tissue: Transports water, nutrients, and food. Includes xylem and phloem.
• Ground Tissue: Involved in photosynthesis, storage, and support.

Examples

Example 1: In humans, muscle tissue enables movement by contracting and relaxing. This tissue is essential for activities like walking and lifting objects.

Example 2: In plants, xylem tissue transports water from the roots to the leaves, which is crucial for photosynthesis.