The Bcl-2 family of proteins is the main controller of the intrinsic (mitochondrial) pathway of apoptosis. Every cell constantly receives two kinds of signals: ones that say “survive” and ones that say “die.” The Bcl-2 family weighs these signals and…
Apoptosis is a programmed, controlled form of cell death. The cell dies in a clean, silent manner without causing inflammation. It uses a group of enzymes called caspases to dismantle itself in an orderly way. There are two main pathways…
Apoptosis is a form of programmed cell death (PCD). It is regulated, caspase-dependent, and non-inflammatory. The cell dismantles itself in a controlled, orderly manner. Cellular contents are packaged into small vesicles called apoptotic bodies. These are quickly cleared by phagocytes…
Unlike apoptosis, necrosis is not a programmed or regulated process. The cell doesn’t receive a signal or activate a pathway. It simply fails. And in its failure, it triggers a chaotic inflammatory response that can cause massive secondary damage to…
Introduction: Why Cells Choose to Die It sounds like a contradiction. Why would a cell—a unit of life—meticulously plan and execute its own destruction? Yet, in multicellular organisms, controlled cell suicide is not only common; it is absolutely essential. This…
Fertilization is one of the most important processes in biology, ensuring the union of a sperm and an egg to form a zygote. But what if more than one sperm enters the egg during fertilization.? This condition, called polyspermy, leads…
Gametogenesis is the biological process of forming gametes. In males, this process produces sperm, while in females it produces the ovum (egg). Formation of sperm is spermatogenesis process, and the formation of ovum is oogenesis process. In humans, we refer…