It is a good idea to think about the human body’s basic architecture, or how its smallest elements are put together to form larger structures, before you start studying its various structures and functions. It is helpful to think of the body’s structures in terms of basic organizational levels that rise in complexity.
The seven levels of classification for the human body are as follows: atoms, molecules, organelles, cells, tissues, organs, organ systems. Only the latter four of these seven levels are regarded to constitute the key classification levels.
Understanding the basic concepts of physiology can help you grasp the numerous levels of organization of the human body. The majority of bodily problems are cellular in nature, therefore pay attention to the cellular and chemical themes you learn and build on them to gain a better understanding of the body as a whole.
Scientists investigate the smallest building components of matter, subatomic particles, atoms, and molecules, to study the chemical level of order. All stuff in the universe is made up of one or more distinct pure substances known as elements, which include hydrogen, oxygen, carbon, nitrogen, calcium, and iron, to name a few.
1. Atom and Subatomic particles
An atom is the smallest unit of any of these pure substances (elements). Protons, electrons, and neutrons are subatomic particles that make up atoms. A molecule is made up of two or more atoms, such as water molecules, proteins, and carbohydrates present in living organisms.
2. Molecules
A molecule is made up of two or more atoms, such as water molecules, proteins, and carbohydrates present in living organisms. All body structures are made up of molecules, which are the chemical building blocks. Molecules make up organelles, which are minute sections of our cells that work together to produce the finest results, much like a factory would.
3. Organelles
A cell membrane (thin outer layer) encloses a jelly-like cellular fluid containing organelles, which are microscopic organ-like structures. Organelles are specialized structures within cells that conduct a variety of functions. The name literally translates to “little organs.” Organelles provide specialized functions to keep a cell alive in the same way that organs such as the heart, liver, stomach, and kidneys serve specific roles to keep an organism alive.
Organelles come in a variety of shapes and sizes, each with its own function (for example, organelles called mitochondrion provides energy to a cell). Depending on their purpose, different types of cells include varied amounts and types of organelles (for example, muscle cells need a lot of energy and so have many mitochondria, whereas skin cells do not and have a few).
4. Cell
A cell is the smallest unit of a living organism that functions autonomously and is enclosed by a flexible, screen-like membrane. Even bacteria, which are microscopic, self-contained organisms, have a cellular structure. Each bacteria consists of only one cell. Cells are found in every living structure in the human body, and cells conduct or begin nearly every activity of human physiology. Cells execute all of life’s processes in humans, as well as in all other species.
Each sort of cell in the diagram has a distinct function. Nerve cells, for example, contain lengthy projections that aid in the transmission of electrical signals to other cells. Muscle cells have a lot of mitochondria, which give them the energy they need to move about. By the time they reach maturity, the average person’s body contains 37 trillion of cell.
4. Tissue
After the cell, the tissue is the next level of organization in the human body. A tissue is made up of several similar cells that work together to provide a certain purpose (albeit it may be made up of a few related types). The four main categories of human tissues are epithelial, muscle, nerve, and connective tissues. These four tissue types make up all of the organs in the human body.
5. Organ
An organ is a body structure made up of two or more tissue types that is anatomically separate . Each organ has one or more physiological roles to perform. Organs are the human body’s next level of structure. An organ is a body structure made up of two or more tissue types that is anatomically separate. Each organ has one or more physiological roles to perform. The heart, brain, lungs, skin, and kidneys are only few of the human organs.
6. Organ System
An organ system is a collection of organs that operate together to carry out significant functions or meet the body’s physiological requirements.
The integumentary system, skeletal system, muscular system, lymphatic system, respiratory system, digestive system, nervous system, endocrine system, cardiovascular system, urinary system, and reproductive systems are among the eleven organ systems.
The highest level of organization is the organism. An organism is a living being with a cellular structure that can conduct all of the physiologic tasks required for survival on its own. All cells, tissues, organs, and organ systems in multicellular creatures, including humans, work together to maintain the organism’s life and health.
How does the Human Body resemble a Finely tuned Machine?
The human body has been compared to a machine by many. Consider common machines like drills and washing machines. Each machine is made up of several pieces, each of which performs a specialized purpose, yet all of the parts work together to complete the total task. In all of these respects, the human body is similar to a machine. In fact, it could be the most incredible machine on the planet.