5A

Levels of Structural Organisation

The hierarchy of biological organization from cells to tissues, organs, and systems.

Cell

The basic unit of structure and function in living organisms.

Tissue

A group of similar cells that work together to perform a specific function.

Organ

A structure composed of multiple tissue types working together.

System

A group of organs coordinating to carry out major biological functions.

Muscle Tissue

A type of tissue responsible for movement, classified into striated, smooth, and cardiac types.

Striated Muscle Tissue

Voluntary muscle attached to the skeleton, responsible for movement.

Smooth Muscle Tissue

Involuntary muscle that surrounds internal organs.

Cardiac Muscle Tissue

Involuntary muscle found only in the heart walls.

Nervous Tissue

Tissue that transmits signals through neurons and supports cells called glia.

Neuron

A type of cell that transmits signals; includes bipolar, unipolar, and multipolar types.

Glia

Supportive cells in nervous tissue that outnumber neurons 10:1.

Epithelial Tissue

Tissue forming body interfaces such as skin and lining of organs.

Connective Tissue

Tissue characterized by cells embedded in an extracellular matrix.

Extracellular Matrix

A network of proteins and molecules surrounding cells in connective tissue.

Small Intestine

An example of an organ composed of epithelial, connective, muscle, and nervous tissues.

Organ Systems

Groups of organs performing a major biological function; includes systems like respiratory and digestive.