Identical or different in structure and functions tissues are combined in organs . Organ - is a part of the body, which has a certain shape, structu

Organs and human systems of organs

Identical or different in structure and functions tissues are combined in organs.

Organ — is a part of the body, which has a certain shape, structure, place, and performs one or more functions.

The human body has different organs: respiratory (airways, lungs), circulatory (heart and blood vessels), digestive (stomach, intestines, etc.), skeletal (bone), motor (muscles, ligaments, tendons), excretory (kidney, skin), reproductive (structurally different in men and women), and sense organs (eyes, ears, skin, etc.).

They are operated by organs of nervous (brain and spinal cord) and endocrine (internal secretion glands) systems.

To perform certain vital functions, the human body organs are combined in organ systems. According to its function, they are divided into systems — respiratory, circulatory, digestive, musculoskeletal, sexual, nervous, excretory, endocrine glands. Taken from http://worldofschool.org

Diagram 14. Levels of organization in the human body: 1 — elemental and molecular; 2 — cellular; 3 — tissular; 4 — organ; 5 — system; 6 — organismic

Human needs all organs and systems, although some of them perform more complex and more important role for the body, while others — a simpler, more specific. In humans, there are functional systems. These permanent or temporary associations of different organ systems are to fulfill a specific function. For example, respiratory and transport system (circulation and blood) are combined into a single functional system to provide the body with oxygen. The same way digestive and transport systems are functionally combined with each other.

Permanent anatomical and functional relationship and the "cooperation" of cells, tissues, organs and organ systems create a complex, unique system — the human body (diagram 14). It lives according to the laws of unity, integrity, self-control and interaction with the environment under the guidance of nervous and humoral system.

Categories:
Questions:
  • Give the definition of "organ".

  • Explain how physiological and functional systems communicate.

  • Explain that gives a human a temporary union of the different organs and systems.