1. Levels of Organization
Cell
Tissue
Organ
System
Organisms
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2. Tissues
A tissue is a group of specialized cells that have the same structure and function.
4 different tissues:
Epithelial Tissue
Connective tissue
Muscle Tissue
Nerve Tissue

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Organ
An organ is a group of several different tissues that are organized a specific way to carry out a specific function
Ex: the artery is a blood vessel made of epithelial, muscle and connective tissues which together make blood circulation possible.
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SYSTEMS
A system is a group of organs that work together to perform a task
Human body consists of many systems to ensure proper functioning
Reproductive System
Digestive System
Respiratory System
Circulatory System
Lymphatic System
Excretory System
Nervous System
Musculoskeletal System
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6. Major Systems of Human Body
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