Structural Organization of the Human Body

Structural Organization of the Human Body

• The human body is organized in six levels: chemical, cellular, tissue, organ, system, and organismal.
• The chemical level involves atoms and molecules.
• The cellular level involves molecules forming cells.
• At the tissue level, similar cells work together.
• The organ level comprises two or more tissues.
• At the system level, organs with similar functions work together.
• The organismal level encompasses all systems, forming a whole human being.

Body Systems

• The integumentary system covers the body.
• The muscular system allows movement.
• The skeletal system provides support and protection.
• The nervous system controls bodily functions.
• The endocrine system regulates hormones.
• The cardiovascular system circulates blood.
• The lymphatic system helps with immunity and fluid balance.