The fundamental unit of life | multicellular and unicellular | study of cell | introduction скачать в хорошем качестве

The fundamental unit of life | multicellular and unicellular | study of cell | introduction

cell of organism This video provides an introduction to the fundamental unit of life: the cell. Here's a summary of the key points: Definition of Cell: The cell is the smallest and most fundamental unit of life (0:06-0:25). The term "cell" is a Latin word meaning "small room" or "small compartment" (0:31-0:43), reflecting its tiny size, visible only through a microscope (0:51-0:54). Study of Cells (Cytology): The study of cells is called cytology or cell biology (1:11-1:31). Discovery of Cells: Dead Cell: The first cell discovered was a dead cell by Robert Hooke in 1665 (1:41-1:47, 3:18-3:28). He observed small, box-like structures in a thin slice of cork from tree bark (1:58-2:43). Living Cell: Living cells were discovered later, in 1674, by Antonie van Leeuwenhoek (3:43-4:06). Types of Organisms based on Cells: Unicellular Organisms: These are organisms made up of a single cell (4:13-4:18, 5:00-5:02). Examples include amoeba, Chlamydomonas, and paramecium (4:53-4:57, 5:26-5:31). Multicellular Organisms: These organisms are composed of multiple cells (4:18-4:22, 5:42-5:47). Examples include fungi, plants, and animals (5:51-6:04). Key Discoveries within the Cell: Nucleus: The nucleus, located within the cell, was discovered by Robert Brown in 1831 (6:34-6:44). Protoplasm: The fluid inside the cell, known as protoplasm, was discovered by Purkinje in 1839 (6:56-7:06). Cell Theory: Schleiden and Schwann proposed the cell theory, stating that animals and plants are made of cells (7:10-7:18). Rudolf Virchow further expanded on this, stating that all cells arise from pre-existing cells through cell division (7:21-8:24). Cell Division and Organ Examples: Some parts of the body, like the liver, have a high rate of cell division (8:36-8:39). Nerve cells (found in the brain) have a very low rate of cell division, highlighting the importance of protecting the brain (8:39-9:01). Why Cell is Fundamental: The cell is considered the fundamental unit of life because it can perform all essential life functions like nutrition, excretion, and metabolism independently (9:12-9:37). Cell Organelles: Cells contain various components called cell organelles (9:54-10:04), which are like the "organs" of the cell. These organelles, such as ribosomes, lysosomes, mitochondria, vacuoles, and endoplasmic reticulum, help the cell perform its various functions (10:05-10:25). Without these organelles, the cell cannot function (10:26-10:33).