Morphology of Cell Injury: The morphology of cell injury refers to the structural and functional changes that occur in cells when they are exposed to physiological stress or harmful stimuli. Cells are constantly subjected to changes in their internal and external environment. Under normal conditions, they adapt to these changes to maintain their normal function…
Causes of Cellular Injury: A cellular injury is a state in which a cell is unable to maintain its normal structure and function due to exposure to harmful stimuli. Cells continuously adapt to physiological and environmental changes; however, when the intensity or duration of a harmful stimulus exceeds the cell’s adaptive capacity, injury occurs. Cellular…
Components and Types of Feedback Systems: A feedback system in human physiology is a regulatory mechanism by which the body monitors and controls its internal environment to maintain homeostasis. Homeostasis refers to the ability of the body to maintain a relatively constant internal environment despite continuous changes in external and internal conditions. Feedback systems ensure…
What are Tissues: The human body is an extraordinarily organized and complex structure composed of millions of cells. These cells do not function independently; instead, they group together in an organized manner to perform specialized activities essential for life. A tissue can therefore be defined as a group of structurally similar cells, along with their…
Forms of Intercellular Signalling: Intercellular signalling is the process through which cells communicate with each other to regulate various functions of the body. In multicellular organisms, cells must exchange information continuously for proper growth, metabolism, immunity, development, and maintenance of homeostasis. This communication occurs through signalling molecules such as hormones, neurotransmitters, cytokines, and growth factors….
General Principles of Cell Communication: Cell communication, also known as cell signaling, is a fundamental biological process through which cells detect, interpret, and respond to signals from their internal and external environments. In multicellular organisms, billions of cells must coordinate their activities to maintain growth, development, metabolism, immunity, tissue repair, and homeostasis. Without proper communication…
Cell junctions are specialized structures in the cell membrane that facilitate communication, adhesion, and coordination between adjacent cells in multicellular organisms. These junctions are crucial in maintaining tissue integrity, allowing cells to work together, and ensuring the proper functioning of various organs and tissues. There are several cell junctions, each with specific functions and structures….
Cell division is a fundamental process in biology by which a single cell divides to produce two or more daughter cells. This process is essential for the growth, development, repair, and reproduction of multicellular organisms. Cell division primarily occurs in two main forms: mitosis and meiosis. Steps in Cell division 1. Mitosis: Mitosis is a…
Transport across the cell membrane is a fundamental process that controls the movement of substances in and out of cells. The cell membrane, also known as the plasma membrane, is a selectively permeable barrier that regulates the passage of molecules and ions. There are two primary mechanisms of transport across the cell membrane: passive transport…
The Cell: A cell is defined as the smallest and most basic unit of life that is responsible for carrying out all of life’s essential processes. It serves as the structural, functional, and biological unit of all living organisms. Cells have the unique ability to replicate themselves independently, which is why they are often referred…