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Key points Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive.
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
For instance, digestive system organs cooperate to process food. The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.
|Tissues, organs, & organ systems (article) | Khan Academy||To your right you will see Claude Bernard —|
Introduction If you were a single-celled organism and you lived in a nutrient-rich place, staying alive would be pretty straightforward.
For instance, if you were an amoeba living in a pond, you could The principles of the homeostasis nutrients straight from your environment. The oxygen you would need for metabolism could diffuse in across your cell membrane, and carbon dioxide and other wastes could diffuse out. When the time came to reproduce, you could just divide yourself in two!
How, then, does the body nourish its cells and keep itself running? Let's take a closer look at how the organization of your amazing body makes this possible.
Multicellular organisms need specialized systems Most cells in large multicellular organisms don't directly exchange substances like nutrients and wastes with the external environment, instead, they are surrounded by an internal environment of extracellular fluid—literally, fluid outside of cells.
The cells get oxygen and nutrients from this extracellular fluid and release waste products into it.
Humans and other complex organisms have specialized systems that maintain the internal environment, keeping it steady and able to provide for the needs of the cells. Different systems of the body carry out different functions. For example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system—is responsible for taking up oxygen and getting rid of carbon dioxide.
The muscular and skeletal systems are crucial for movement; the reproductive system handles reproduction; and the excretory system gets rid of metabolic waste.
Because of their specialization, these different systems are dependent on each other. The cells that make up the digestive, muscular, skeletal, reproductive, and excretory systems all need oxygen from the respiratory system to function, and the cells of the respiratory system—as well as all the other systems—need nutrients and must get rid of metabolic wastes.
All the systems of the body work together to keep an organism up and running. Overview of body organization All living organisms are made up of one or more cells. Unicellular organisms, like amoebas, consist of only a single cell.
Multicellular organisms, like people, are made up of many cells. Cells are considered the fundamental units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task.
Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems. From left to right: For instance, the cells in the small intestine that absorb nutrients look very different from the muscle cells needed for body movement.Water B.
cannon wrote the classic book on physiology called “The wisdom of the body” and introduced the word homeostasis which means constant state. Much . The aim of this essay below is to explain homeostasis, the principles involves, the negative feedback, the control of the blood glucose level, the mechanism of temperature regulation and the structure of the kidney and the function and the hormonal control of osmoregulation.
Water B. cannon wrote the classic book on physiology called “The wisdom of the body” and introduced the word homeostasis which means constant state. Much . General principles of Homeostasis Homeostasis is the way the body maintains a stable internal environment.
It is important for the body to have a stable environment for cells to function correctly. Principles of Homeostasis. EXCESS. NORM. DEFICIENCY.
Change detected by β-cells in pancreas. Change detected by α-cells in pancreas. Increase in insulin secretion Homeostasis is achieved by a negative feedback and involves.
Change in level of an internal factor (change from norm level). Sep 07, · Best Answer: Homeostasis The relatively constant conditions within organisms, or the physiological processes by which such conditions are maintained in the face of external variation.
Similar homeostatic controls are used to keep factors such as temperature and blood pressure nearly constant despite changes Status: Resolved.