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  2. Zoology - Wikipedia

    en.wikipedia.org/wiki/Zoology

    Anatomy considers the forms of macroscopic structures such as organs and organ systems. [29] It focuses on how organs and organ systems work together in the bodies of humans and other animals, in addition to how they work independently. Anatomy and cell biology are two studies that are closely related, and can be categorized under "structural ...

  3. Biological system - Wikipedia

    en.wikipedia.org/wiki/Biological_system

    These specific systems are widely studied in human anatomy and are also present in many other animals. Respiratory system: the organs used for breathing, the pharynx, larynx, bronchi, lungs and diaphragm. Digestive system: digestion and processing food with salivary glands, oesophagus, stomach, liver, gallbladder, pancreas, intestines, rectum ...

  4. Human body - Wikipedia

    en.wikipedia.org/wiki/Human_body

    At maturity, there are roughly 30 trillion cells, and 38 trillion bacteria in the body, [3] [4] an estimate arrived at by totaling the cell numbers of all the organs of the body and cell types. The skin of the body is also host to billions of commensal organisms as well as immune cells. [ 5 ]

  5. Human anatomy - Wikipedia

    en.wikipedia.org/wiki/Human_anatomy

    Many books such as Human Anatomy for Artists: The Elements of Form, are written as a guide to drawing the human body anatomically correctly. [4] Leonardo da Vinci sought to improve his art through a better understanding of human anatomy. In the process he advanced both human anatomy and its representation in art.

  6. List of systems of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_systems_of_the...

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 February 2025. List of organ systems in the human body Part of a series of lists about Human anatomy General Features Regions Variations Movements Systems Structures Arteries Bones Eponymous Foramina Glands endocrine exocrine Lymphatic vessels Nerves Organs Systems Veins Muscles Abductors Adductors ...

  7. 50 Earth Day Trivia Questions and Answers to Inspire You to ...

    www.aol.com/lifestyle/50-earth-day-trivia...

    Earth Day is on April 22, but really, it should be every day—saving the planet should be a daily occurrence! From conservation to wildlife to politics, test your environmental and historical ...

  8. Outline of biology - Wikipedia

    en.wikipedia.org/wiki/Outline_of_biology

    Radiographic anatomy – study of anatomy through radiography; Surface anatomy – study of external features of a body; Biochemistry – study of the chemical reactions required for life to exist and function, usually a focus on the cellular level. Biophysics – study of biological processes through the methods traditionally used in the ...

  9. Organ (biology) - Wikipedia

    en.wikipedia.org/wiki/Organ_(biology)

    The abdominal organs may be classified as solid organs or hollow organs. The solid organs are the liver, pancreas, spleen, kidneys, and adrenal glands. The hollow organs of the abdomen are the stomach, intestines, gallbladder, bladder, and rectum. [6] In the thoracic cavity, the heart is a hollow, muscular organ. [7]