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The human kidney is a remarkable organ that performs various functions essential for maintaining overall health. The nephron is the fundamental structural and functional unit of the kidney, responsible for the filtration and purification of blood. It is the core of the kidney that determines the state and strength of kidneys. The structure and function of nephrons invariably decide the overall functioning of the human kidney. A careful observation of the nephron diagram in the later section of this blog post will help you gain more insights with the help of the illustration.

There are at least one million nephrons in each kidney, and together, they drive the kidneys, collectively serving as the functional unit responsible for filtering blood and regulating the body’s fluid balance. As we explore the structure and functions of nephrons, and parts of nephrons, we actually shed light on their significance in maintaining overall health.

Functions of Nephron
The Nephron functions are explained below,
Filtration
Filtration is the first step in urine formation and occurs in the renal corpuscle. As blood passes through the glomerulus, the high-pressure forces water, ions, nutrients, and waste products out of the blood and into the Bowman’s capsule. This fluid, known as the filtrate, contains substances that need to be selectively reabsorbed or excreted.

Reabsorption
Reabsorption takes place primarily in the renal tubule. Essential substances, such as glucose, amino acids, and water, are selectively reabsorbed into the surrounding capillaries to be returned to the bloodstream. This process ensures that vital molecules are retained in the body, maintaining balance.

Secretion
Secretion involves the transfer of additional substances, such as excess ions, drugs, and toxins, from the blood into the renal tubule. This process allows the nephron to regulate the concentration of certain substances in the body, aiding in the elimination of waste and maintenance of homeostasis.

Excretion
Excretion is the final step in urine formation. After the filtrate has undergone reabsorption and secretion processes in the renal tubule, it reaches the collecting duct. Here, additional water and solutes are reabsorbed or excreted based on the body’s needs, resulting in the formation of concentrated urine.

Types of Nephrons
There are two main types of nephrons: cortical nephrons and juxtamedullary nephrons.

Cortical Nephrons
Cortical nephrons are the most abundant type, comprising approximately 85% of all nephrons. They are primarily located in the outer region of the kidney cortex and have a shorter loop of Henle. These nephrons are involved in maintaining overall body fluid balance.

Juxtamedullary Nephrons
Juxtamedullary nephrons are located closer to the medulla of the kidney and have a longer loop of Henle. They play a crucial role in producing concentrated urine and are involved in the body’s water conservation mechanisms.

The nephron, as the functional unit of the kidney, performs vital tasks to maintain fluid balance, regulate blood pressure, and eliminate waste products from the body. It is an intricate system that ensures the proper filtration, reabsorption, and secretion processes required for overall health and well-being.

Understanding the structure and functions of nephron, and their types provides valuable insights into the complex processes involved in urine formation. The nephron’s remarkable capabilities enable the body to maintain a delicate balance and eliminate waste effectively. By comprehending the significance of nephrons, we can appreciate the intricacies of the human body’s filtration system.

Hope our article has introduced you to more interesting information about the human body, and added extra knowledge. Tutoroot, as an educational institute offers online interactive classes with a personalised touch. Click here to book a free demo of our live interactive sessions for NEET Online Tuitions and much more for the various boards.

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