Levels of Organization and Body Systems

Front

What is the basic unit of structure and function in the human body?

Back

Cell

Front

What is a group of cells that have similar functions?

Back

Tissues (e.g., nervous, epithelial, muscle, connective)

Front

When many organ systems work together, what do they form?

Back

Organism

Front

What is the difference between a cell and a tissue?

Back

A cell is the basic unit of life; a tissue is a group of cells that work as one.

Front

What level of organization is the heart?

Back

Organ

Front

What is an organ?

Back

A structure made up of different types of tissues that work together to perform a specific function.

Front

What is an organ system?

Back

A group of organs that work together to perform complex functions in the body.

Front

What are the four main types of tissues in the human body?

Back

Nervous, epithelial, muscle, and connective tissues.

Front

What is the hierarchy of organization in the human body from smallest to largest?

Back

Cell → Tissue → Organ → Organ System → Organism

Front

What is the function of epithelial tissue?

Back

To cover and protect surfaces, and to absorb, secrete, and sense.