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Nov 3, 2023 · This topic page will provide you with a quick introduction to the systems of the human body, so that every organ you learn later on will add a superstructure to the basic concept you adopt here.
- Main Bones, Joints & Muscles
Main bones of the skeletal system. We’ll begin by looking at...
- Lymphatic System
The lymphatic system is a network of vessels and organs that...
- Ventricles of The Brain
The human brain is so vital and delicate that it is fully...
- Peripheral Nerves
Peripheral nerves. The workhorse of the peripheral nervous...
- Musculoskeletal System
Musculoskeletal system The musculoskeletal system (locomotor...
- Endocrine System
The pituitary gland has two main parts: neurohypophysis and...
- Integumentary System
Functions. The skin has a significant capacity for renewal...
- Main Bones, Joints & Muscles
Life processes of the human body are maintained at several levels of structural organization. These include the chemical, cellular, tissue, organ, organ system, and the organism level. Higher levels of organization are built from lower levels.
- The Levels of Organization
- Section Summary
- Glossary
To study the chemical level of organization, scientists consider the simplest building blocks of matter: subatomic particles, atoms and molecules. All matter in the universe is composed of one or more unique pure substances called elements, familiar examples of which are hydrogen, oxygen, carbon, nitrogen, calcium, and iron. The smallest unit of an...
Life processes of the human body are maintained at several levels of structural organization. These include the chemical, cellular, tissue, organ, organ system, and the organism level. Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs,...
cell
1. smallest independently functioning unit of all organisms; in animals, a cell contains cytoplasm, composed of fluid and organelles
organ
1. functionally distinct structure composed of two or more types of tissues
organ system
1. group of organs that work together to carry out a particular function
Oct 28, 2024 · The human body is the physical substance of the human organism. Characteristic of the vertebrate form, the human body has an internal skeleton with a backbone, and, as with the mammalian form, it has hair and mammary glands. Learn more about the composition, form, and physical adaptations of the human body.
- The Editors of Encyclopaedia Britannica
- Chemically, the human body consists mainly of water and organic compounds—i.e., lipids, proteins, carbohydrates, and nucleic acids. The human body...
- The four main types of tissue in the human body are epithelial, muscle, nerve, and connective.
- The nine major organ systems in the human body are the integumentary system, the musculoskeletal system, the respiratory system, the circulatory sy...
There are 12 major anatomy systems: Skeletal, Muscular, Cardiovascular, Digestive, Endocrine, Nervous, Respiratory, Immune/Lymphatic, Urinary, Female Reproductive, Male Reproductive, Integumentary. Select a system below to get started.
Jul 25, 2024 · In terms of structure and function, the human body is organized into six levels: chemical (atoms and molecules), cellular, tissue, organ, organ system and organism. Each level builds upon the previous one, from the most basic chemical components to a fully functioning human being.
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Life processes of the human body are maintained at several levels of structural organization. These include the chemical, cellular, tissue, organ, organ system, and the organism level. Higher levels of organization are built from lower levels.
