Advanced searches left 3/3
Search only database of 7.4 mil and more summaries

Levels Of Organization In Order From Smallest To Largest

Summarized by PlexPage
Last Updated: 02 December 2020

* If you want to update the article please login/register

General | Latest Info

Before you begin to study different structures and functions of the human body, it is helpful to consider its basic architecture; that is, how its smallest parts are assembled into larger structures. It is convenient to consider structures of the body in terms of fundamental levels of organization that increase in complexity, such as: chemicals, cells, tissues, organs, organ systems, and organism. Organization of the body is often discussed in terms of distinct levels of increasing complexity, from the smallest chemical building blocks to unique human organism. 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. Examples of these elements are hydrogen, oxygen, carbon, nitrogen, calcium, and iron. The smallest unit of any of these pure substances is atom. Atoms are made up of subatomic particles such as proton, electrons and neutron. Two or more atoms combine to form molecule, such as water molecules, proteins, and sugars found in living things. Molecules are chemical building blocks of all body structure. Cell is the smallest independently functioning unit of a living organism. Single celled organisms, like bacteria, are extremely small, independently-living organisms with cellular structure. Humans are multicellular organisms with independent cells working in concert together. Each bacterium is a single cell. All living structures of human anatomy contain cells, and almost all functions of human physiology are performed by cells or are initiated by cells. Human cells typically consist of flexible membranes that enclose cytoplasm, water-base cellular fluid, with a variety of tiny functioning units called Organelles. In humans, as in all organisms, cells perform all the functions of life. Tissue is a group of many similar cells that work together to perform specific function. The organ is anatomically distinct structure of the body composed of two or more tissue types. Each organ performs one or more specific physiological functions. Organ system is a group of organs that work together to perform major functions or meet physiological needs of the body. This book covers eleven distinct organ systems in the human body. Assigning organs to organ systems can be imprecise since organs that belong to one system can also have functions integral to another system. In fact, most organs contribute to more than one system. Organism level is the highest level of organization. Organism is a living being that has a cellular structure and that can independently perform all physiologic functions necessary for life. In multi-cellular organisms, including humans, all cells, tissues, organs, and organ systems of the body work together to maintain the life and health of the organism.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Video Transcript

Living things are highly organized and structure, following a hierarchy that can be examined on a scale from small to large. Atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons. Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. Many molecules that are biologically important are macromolecules, large molecules that are typically formed by polymerization. An example of a macromolecule is deoxyribonucleic acid, which contains instructions for the structure and functioning of all living organisms. See section of your textbook about chemistry of biological molecules for more information. Some cells contain aggregates of macromolecules surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of organelles include mitochondria and chloroplasts, which carry out indispensable functions: mitochondria produce energy to power cell, while chloroplasts enable green plants to utilize energy in sunlight to make sugars. All living things are made of cells; cell itself is the smallest fundamental unit of structure and function in living organisms. This requirement is one of the reasons why viruses are not considered living: they are not made of cells. To make new viruses, they have to invade and hijack reproductive mechanisms of living cell; only then can they obtain materials they need to reproduce. Some organisms consist of single cell and others are multicellular. Cells are classified as prokaryotic or eukaryotic. Prokaryotes are single-celled or colonial organisms that do not have membrane-bound nuclei; in contrast, cells of eukaryotes do have membrane-bound organelles and membrane-bound nucleus. In larger organisms, cells combine to make tissues, which are groups of similar cells carrying out similar or related functions. Organs are collections of tissues grouped together performing a common function. Organs are present not only in animals but also in plants. An organ system is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, circulatory systems transport blood through the body and to and from lungs; it includes organs such as the heart and blood vessels. Organisms are individual living entities. For example, each tree in the forest is an organism. Single-celled prokaryotes and single-celled eukaryotes are also considered organisms and are typically referred to as microorganisms. All individuals of species living within a specific area are collectively called population. For example, forest may include many pine trees. All of these pine trees represent the population of pine trees in this forest. Different populations may live in the same specific area. For example, forests with pine trees include populations of flowering plants and also insects and microbial populations. A community is a sum of populations inhabiting a particular area. For instance, all of the trees, flowers, insects, and other populations in the forest form a forest community. The forest itself is an ecosystem.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Explanation

Macromolecules can form aggregates within cells that are surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of these include: mitochondria and chloroplasts, which carry out indispensable functions. Mitochondria produce energy to power cells while chloroplasts enable green plants to utilize energy in sunlight to make sugars. All living things are made of cells, and the cell itself is the smallest fundamental unit of structure and function in living organisms. Some organisms consist of single cell and others are multicellular. Cells are classified as prokaryotic or eukaryotic. Prokaryotes are single-celled or colonial organisms that do not have membrane-bound nuclei; in contrast, cells of eukaryotes do have membrane-bound organelles and membrane-bound nucleus. In larger organisms, cells combine to make tissues, which are groups of similar cells carrying out similar or related functions. Organs are collections of tissues grouped together performing a common function. Organs are present not only in animals but also in plants. An Organ System is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, circulatory system transport blood through the body and to and from lungs; it includes organs such as the heart and blood vessels. Furthermore, organisms are individual living entities. For example, each tree in the forest is an organism. Single-celled prokaryotes and single-celled eukaryotes are also considered organisms and are typically referred to as microorganisms. All individuals of species living within a specific area are collectively called population. For example, forest may include many pine trees. All of these pine trees represent the population of pine trees in this forest. Different populations may live in the same specific area. For example, forests with pine trees include populations of flowering plants and also insects and microbial populations. A community is a sum of populations inhabiting a particular area. For instance, all of the trees, flowers, insects, and other populations in the forest form a forest community. The forest itself is an ecosystem. The ecosystem consists of all living things in a particular area together with abiotic, non-living parts of that environment such as nitrogen in soil or rain water. At the highest level of organization, biosphere is a collection of all ecosystems, and it represents zones of life on earth. It includes land, water, and even the atmosphere to a certain extent. Take together, all of these levels comprise biological levels of organization, which range from organelles to biosphere.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Sources

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

logo

Plex.page is an Online Knowledge, where all the summarized are written by a machine. We aim to collect all the knowledge the World Wide Web has to offer.

Partners:
Nvidia inception logo
jooble logo

© All rights reserved
2021 made by Algoritmi Vision Inc.

If your domain is listed as one of the sources on any summary, you can consider participating in the "Online Knowledge" program, if you want to proceed, please follow these instructions to apply.
However, if you still want us to remove all links leading to your domain from Plex.page and never use your website as a source, please follow these instructions.