Chapter 5 Cell Specialization & Levels of Organization

Organism Organization Organisms are highly organized. Organization begins with the basic unit of matter – an atom Atoms join together to make molecules – carbohydrates, proteins, lipids Molecules join with other molecules to make cells

Cells join with other cells to form tissues There are four types of tissues which make up organs Organs make up organ systems Organ systems make up an organism

Levels of Organization Molecules Cells Tissues Organs Organ Systems Organism Goes from smallest to largest

Cell Specialization The cells in our body are specialized to perform certain functions. Ex. The cells lining our stomach are specialized to secrete mucous and digestive enzymes

Cells The body is made up of individual cells. Light receptor cells nerve cells muscle cells mucous cells

Tissues Cells are grouped into specialized groups called tissue Some cells which line the stomach produce digestive enzymes. Together they make up a tissue. The cells in our eye which capture light are another type of tissue. The cells in our muscles can contract.

Organs Organs are made up of groups of tissue which work together to perform a specific function. The Heart is made up of muscle tissue, nerve tissue and connective tissue. The stomach is made up of muscle tissue and epithelial tissue.

Organ System An organ system is a group of organs which work together to perform a specific function. digestive system Nervous system circulatory system