In An Animal, A Blood Cell Is Which Level Of Organization?

i.2C: Levels of System

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Living organisms are made up of four levels of organisation: cells, tissues, organs, and organ systems.

Learning Objectives

Order the levels of organisation for living organisms

Fundamental Points

Cells are the most basic unit of life at the smallest level of organisation.
Cells can be prokaryotic (without nucleus) or eukaroyotic (with nucleus).
The 4 categories of tissues are connective, muscles, epithelial, and nervous tissues.
Organs are made of different types of tissues and perform complex functions. They can be hollow or solid.
Organ systems are groups of organs that perform similar functions or perform functions together.
Many physiological functions are carried out by multiple organ systems working in tandem.

Cardinal Terms

cell: The smallest unit of life capable of contained reproduction. Generally contains nucleic acid, cytoplasm, a cell membrane, and many other proteins and structures.
organ: A structure fabricated of unlike tissues that work together to perform physiological functions.
organ system: A grouping of organs and tissues that work together to perform specific functions.
Tissues: A group of similar cells with the same origin that piece of work together to perform the same role.

EXAMPLES

Using the circulatory organization every bit an example, a cell in this system is a cherry-red blood cell, the heart's cardiac muscle is a tissue, an organ is the heart itself, and the organ organization is the circulatory organization.

An organism is made upwardly of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this arrangement makes the components easier to understand.

Level 1: Cells

The first and most basic level of arrangement is the cellular level. A cell is the basic unit of life and the smallest unit capable of reproduction. While cells vary greatly in their construction and function based on the type of organism, all cells have a few things in common. Cells are fabricated up of organic molecules, contain nucleic acids (such equally Deoxyribonucleic acid and RNA), are filled with fluid called cytoplasm, and have a membrane made out of lipids. Cells too contain many structures within the cytoplasm called organelles, which perform diverse cellular functions.

Cells may be prokaryotic (without a nucleus) in bacteria and archaea (single-celled organisms), or eukaryotic (with nucleus-enclosing DNA) in plants, animals, protists, and fungi. In humans, most cells combine to form tissues, but some cells are constitute independent of solid tissues and have their own functions. A blood-red blood cell plant circulating in the bloodstream conveying oxygen throughout the human body is an instance of an independent cell.

Level ii: Tissues

Tissues are a group of similar cells of the same origin that carry out a specific part together. Humans have four different types of basic tissues. Connective tissues such equally bone tissue are made upward of fibrous cells and give shape and construction to organs. Muscle tissue is made upward of cells that can contract together and allow animals to motion. Epithelial tissues make upwards the outer layers of organs, such as the skin or the outer layer of the stomach. Nervous tissue is fabricated of specialized cells that transmit information through electrochemical impulses, such as the tissue of nerves, the spinal string, and the brain.

Level three: Organs

An organ is a construction made upwards of different tissues that perform specific bodily functions. Most organs contain tissues such every bit parenchyma (used to perform the organ functions), stroma (connective tissue specific to organs) and epithelial. Organs may be solid or hollow, and vary considerably in size and complication. The heart, lungs, and brain are all examples of organs.

Level iv: Organ Systems

An organ arrangement is a collection of organs that that work together to perform a similar function. There are eleven different organ systems in the human torso, each with its own specific functions. I example is digestive organization, which is made upward of many organs that piece of work together to digest and absorb nutrients from food. While well-nigh organ systems control a few specific physiological processes, some processes are more than complex and require multiple organ systems to work together. For example, blood pressure is controlled by a combination of the renal organization (kidneys), the circulatory system, and the nervous system.

This image provides an example of the levels of organization in a living organism, with illustrations of a cell, of tissue, of the stomach (organ), and of the full digestive system.

Levels of Organization in Animals: An organism contains organ systems made upward of organs that consist of tissues, which are in turn made up of cells.

Source: https://med.libretexts.org/Bookshelves/Anatomy_and_Physiology/Book%3A_Anatomy_and_Physiology_(Boundless)/1%3A_Introduction_to_Anatomy_and_Physiology/1.2%3A_Life/1.2C%3A_Levels_of_Organization

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