Learn: Specialised Cells, Tissues, Organs, and Organ Systems

Welcome!Welcome back! You've already learned about animal and plant cells, their structures, and how to use a microscope to examine them. Today, we’ll build on that by exploring how cells become specialised and work together in tissues, organs, and organ systems.

What are Specialised Cells?Specialised cells are cells that have adapted specific structures to perform particular functions. This allows organisms to carry out complex processes efficiently. For example, red blood cells are specialised to carry oxygen.

What are Tissues?Tissues are groups of similar cells working together to perform a specific function. For example, muscle tissue is made of muscle cells that contract to produce movement.

What are Organs?Organs are structures made of different tissues working together to perform a specific function. For example, the heart is an organ that pumps blood and consists of muscle, connective, and epithelial tissues.

What are Organ Systems?Organ systems are groups of organs that work together to perform large-scale functions. For example, the digestive system breaks down food, absorbs nutrients, and removes waste.

How Do These Levels Work Together?The levels of biological organisation build upon each other. Specialised cells form tissues, tissues combine to create organs, and organs work together in organ systems. This structure allows living organisms to function efficiently.

Review Time!Great work! You've learned about specialised cells, tissues, organs, and organ systems. Now let's test your understanding with a few questions.