Knowra Body & organ systems Body & organ systems The human body is organized into interacting organ systems, each composed of organs and tissues that perform related functions. Together, these systems maintain the conditions needed for life.
Cell : The smallest structural and functional unit of living organisms. Cells combine into tissues, the basic material from which organs are built.
Nervous system : The network of the brain, spinal cord, and nerves that senses information and coordinates rapid responses. It rapidly directs organs and links sensation to action.
Medical diagnosis : The process of identifying a disease or condition from evidence about a person's health. Symptoms and test results are often interpreted by the affected organ system.
Organism : An individual living entity capable of carrying out the processes of life. The body is one level of organization within the whole human organism.
Tissue : A group of similar cells and their surrounding material that performs a shared function. Four major tissue types form the organs of the body.
Endocrine system : The glands and tissues that release hormones to regulate body functions over time. Hormones coordinate processes such as growth, metabolism, and reproduction.
Physical examination : A clinical assessment using observation, touch, percussion, and listening to evaluate the body. Examination findings help assess the function of specific organs and systems.
Anatomy : The study of the structures of living organisms and the relationships among them. Anatomy describes the structures that the systems model groups together.
Organ : A body structure made of multiple tissue types working together for particular functions. Organs are the functional units grouped into organ systems.
Circulatory system : The heart and blood vessels that move blood, gases, nutrients, and wastes through the body. Blood connects distant organs by transporting materials between them.
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