organlari

An organ is a specialized structure composed of several tissues that work together to perform one or more specific functions necessary for the survival, growth, and reproduction of an organism. In multicellular animals and plants, organs are organized into organ systems that coordinate physiology and response to the environment.

In humans and other animals, major organs include the heart, lungs, liver, kidneys, stomach, intestines, brain, skin, and reproductive organs. In plants, organs include roots, stems, leaves, and flowers. These organs carry out essential tasks such as circulation, respiration, digestion, perception, support, and reproduction.

Organs are composed of different tissue types. In animals, tissues typically include epithelial, connective, muscle, and nervous tissue that together carry out the organ’s function. In plants, organs contain dermal, ground, and vascular tissues that support growth, photosynthesis, and nutrient transport.

Organs develop from embryonic germ layers during organogenesis. The architecture and function of organs are adapted to the organism’s lifestyle and environment; some organs are paired (like kidneys or lungs) while others are single (like the heart). Variation occurs across species, reflecting evolutionary changes.

Organ health affects overall homeostasis. Organ failure can be life-threatening, and medical science uses approaches such as organ transplantation, dialysis, and supportive therapies to treat dysfunction. It is important to distinguish organs from cellular organelles, which are subcellular components such as the mitochondrion or ribosome.