Today's topic is very interesting and it is about basic structure of human body. Many structures are present in human body but we will starts from micro level and then go to macro level. What is the basic structural unit of human body but I will discuss this and after that I will discuss that how these basic structures forms to make the body of a human.
Cell is considered the basic structural unit of a human body but if we see at more micro level then organelles are present in a cell and when different organelles combine then they forms are sell structure. So sequence of different structural units to make a human body start from organelles that combines to form a cell and then cell further combines to form a tissue and then different tissue combines with each other then they form organ and when different organs combine then they form organ system and then a human functioning occurs properly.
Organelles are the smallest structures of cells that are specified to carry out different functions in cells.There are different organelles specified to carry out different functions.Names of different organelles are mitochondria , lysosomes, centrioles and there are different functions specified for each organelle.
If I talk about mitochondria then mitochondria is considered as powerhouse of cell because it provides energy and catalyse metabolic reactions in cells as well as it is a self replicating organelle which is second plus point just like this if there is any foreign particle which is harmful for cell then lysosomes are responsible for engulfing these particles or these stuff.
After that when all these organelles present then they combines to form a cell which is the basic structural unit of body and we can say the building block of body.
After that there are some specific types of cell that are specified to perform several functions for example there are parietal cells present in body which are specified for several functions as well as their follicles cells present in body.
Sometimes different cells combines with each other and then they form are tissue which is specialised or specified to perform several tasks in body.
Now there is a clear understanding that what are tissues present in body so basically these are the group of cells specified to perform similar function and when these tissues combines then they also form an organ like kidney is an organ make up of different tissues which are specified for performing same function which is the function of kidney.
After organ the other largest structure in human body that is present is the organ system in which there are different organs and different processes takes place and the functioning of an organ takes place in an organ system as water purification is specified for organ system of kidneys.