Kidney structure and function pdf

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kidney structure and function pdf

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Anatomy and Function of the Urinary System

Regulation of extracellular fluid volume. The kidneys work to ensure an adequate quantity of plasma to keep blood flowing to vital organs. Regulation of osmolarity. The kidneys help keep extracellular fluid from becoming too dilute or concentrated with respect to the solutes carried in the fluid. Regulation of ion concentrations.

The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart. Nephrons are the most important part of each kidney. They take in blood, metabolize nutrients, and help pass out waste products from filtered blood.

Structure and Function of the Kidneys

Click Image to Enlarge. The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The kidney and urinary systems help the body to get rid of liquid waste called urea. Urea is produced when foods containing protein such as meat, poultry, and certain vegetables are broken down in the body.

Renal Structure and Function. Sodium Metabolism. Renal Function. Good stuff. Bad stuff. Endocrine hormone. Metabolic substrate. Page 5. Gross anatomy.

25.1 Internal and External Anatomy of the Kidney

Nephron , functional unit of the kidney , the structure that actually produces urine in the process of removing waste and excess substances from the blood. There are about 1,, nephrons in each human kidney. The most primitive nephrons are found in the kidneys pronephros of primitive fish, amphibian larvae, and embryos of more advanced vertebrates. The nephrons found in the kidneys mesonephros of amphibians and most fish, and in the late embryonic development of more advanced vertebrates, are only slightly more advanced in structure.

The kidneys are two reddish-brown bean-shaped organs found in vertebrates. Each kidney is attached to a ureter , a tube that carries excreted urine to the bladder. The nephron is the structural and functional unit of the kidney. Each adult human kidney contains around 1 million nephrons, while a mouse kidney contains only about 12, nephrons.

Figure 1. Kidneys filter the blood, producing urine that is stored in the bladder prior to elimination through the urethra. The kidneys , illustrated in Figure 1, are a pair of bean-shaped structures that are located just below and posterior to the liver in the peritoneal cavity. The adrenal glands sit on top of each kidney and are also called the suprarenal glands.

Kidney Overview