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Gland & Types of Gland in Urdu/Hindi.

Cytoplasm:

Definition:
Cytoplasm is a gel-like, semi-fluid substance present within the cell membrane of all living cells. It fills the space between the cell membrane and the nucleus in eukaryotic cells, encompassing various cellular components and organelles.

Composition and Structure:
The cytoplasm consists of several components, including:

1. Cytosol: The aqueous, jelly-like substance that makes up the bulk of the cytoplasm. It contains water, ions, nutrients, and various molecules necessary for cellular processes.

2. Organelles: Numerous membrane-bound structures with specific functions, such as mitochondria (energy production), endoplasmic reticulum (protein synthesis and lipid metabolism), Golgi apparatus (protein processing and secretion), lysosomes (digestion of waste materials), and more.

3. Cytoskeleton: A network of protein filaments (microfilaments, intermediate filaments, and microtubules) that provides structural support, maintains cell shape, and aids in intracellular transport.

4. Ribosomes: Tiny structures involved in protein synthesis. They can be free-floating in the cytosol or bound to the endoplasmic reticulum.

Regions and Parts:
The cytoplasm can be divided into two regions:

1. Ectoplasm: The outer, clearer portion of the cytoplasm that is in close proximity to the cell membrane. It contains a higher concentration of actin filaments, contributing to cell shape and movement.

2. Endoplasm: The inner, denser portion of the cytoplasm containing a higher concentration of organelles and other cellular structures.

Function:
Cytoplasm plays a crucial role in various cellular functions:

1. Cellular Metabolism: Many metabolic reactions, such as glycolysis, occur in the cytoplasm. It provides a medium for these reactions to take place.

2. Intracellular Transport: The cytoplasm serves as a highway for intracellular movement of organelles, vesicles, and molecules. The cytoskeleton helps facilitate this transport.

3. Protein Synthesis: Ribosomes in the cytoplasm and on the endoplasmic reticulum translate genetic information into proteins.

4. Storage: It can store various molecules, including nutrients, ions, and waste products.

5. Cell Division: During cell division, the cytoplasm divides along with the cell to ensure that each daughter cell receives the necessary organelles and molecules.

6. Support and Shape: The cytoskeleton provides structural support and helps maintain cell shape.

7. Signal Transduction: The cytoplasm is involved in transmitting signals from the cell membrane to the nucleus, regulating gene expression and cellular responses.

In summary, cytoplasm is a dynamic and essential component of eukaryotic cells. Its diverse functions and intricate structure contribute to the overall health, survival, and proper functioning of cells.

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0:00 - Introduction
0:51 - Meaning Cytoplasm
1:17 - Definition of Cytoplasm
1:54 - Regions of Cytoplasm
3:09 - Parts of Cytoplasm
4:58 - Composition of Cytoplasm
7:32 - Functions of Cytoplasm
10:03 - Summary of the Topic

Structure of Human Kidney:
The human kidney is a bean-shaped organ about the size of a fist, located on either side of the spine, just below the ribcage. Each kidney is made up of an outer layer called the renal cortex and an inner region known as the renal medulla. Within the medulla are cone-shaped structures called renal pyramids.

The kidney's functional unit is the nephron, which consists of a renal corpuscle (containing the glomerulus and Bowman's capsule) and a renal tubule. Blood is filtered in the glomerulus, and the filtrate then travels through the renal tubule where substances are reabsorbed and waste products are excreted. The nephrons connect to collecting ducts, which carry the processed urine to the renal pelvis and eventually to the bladder for elimination. Blood vessels, including the renal artery and renal vein, play a crucial role in maintaining blood supply and filtration processes within the kidney.

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'sFilters

The urinary system, also known as the renal system, is responsible for the production, storage, and elimination of urine in the human body. Its main components include the kidneys, ureters, bladder, and urethra.

1. Kidneys: There are two kidneys, located in the upper abdominal cavity, on either side of the spine. The kidneys filter waste products, excess water, and other impurities from the blood to produce urine. They also play a crucial role in maintaining the body's fluid balance, electrolyte levels, and blood pressure.

2. Ureters: Each kidney is connected to the bladder by a tube called a ureter. Ureters are muscular tubes that transport urine from the kidneys to the bladder. The urine moves through the ureters through peristaltic contractions, which are rhythmic muscular movements that propel the urine forward.

3. Bladder: The bladder is a hollow, muscular organ located in the pelvis. It serves as a temporary storage reservoir for urine. When the bladder fills with urine, it expands and sends signals to the brain, indicating the need for urination. The bladder can expand and contract to accommodate varying amounts of urine.

4. Urethra: The urethra is a tube that carries urine from the bladder to the outside of the body. In males, the urethra also serves as the passage for semen during ej*******on. The length of the urethra differs between males and females, with the male urethra being longer.

The process of urine formation involves the filtration of blood in the kidneys, reabsorption of essential substances, and the secretion of waste products into urine. The urine is then transported from the kidneys to the bladder through the ureters. When the bladder is full, urination occurs, and the urine is expelled from the body through the urethra.

It's important to note that the urinary system works in conjunction with other systems in the body, such as the circulatory system, to maintain homeostasis and eliminate waste products.