nephron and concentrations of interstital fluid image

NEPHRON AND CONCENTRATIONS OF INTERSTITAL FLUID IMAGE SERIES

It never functions as a kidney, but its ductule system gives rise to portions of the metanephros and the The latter develops from the urogenital ridge toward the end of the fourth week and lasts through the eighth week. The most primitive kidney, the develops during the fourth week and persists only through the sixth week. The permanent set of kidneys derives from a which begins to form during the fifth Survey week of embryonic development The metanephros has two mesodermal sources: (1) a ureteric bud and (2) a metanephrogenic which develops from the urogenital ridge and forms the meaty portion of the kidney.įigure 21.3 Development of the embryonic kidney.Ģ1.5 Is the metanephros the only precursor of the kidney? Objective trace the embryonic development of the kidneys. Sympathetic stimulation of the renal plexus produces a vasomotor response in the kidneys that affects the circulation of the blood by regulating the diameters of arterioles. The kidneys have an autonomic nerve supply derived from the tenth, eleventh, and twelfth thoracic nerves.

NEPHRON AND CONCENTRATIONS OF INTERSTITAL FLUID IMAGE SERIES

The concave medial surface is called the and through it the renal artery enters and the renal vein and ureter exit The kidney is embedded retroperitoneally in an adipose and fibrous The outer portion of the kidney, or the renal contains capillary tufts and convoluted tubules the inner portion, or the renal is composed of a series of triangular masses, called renal separated by renal The apex of each pyramid is called a renal and each papilla projects into a small depression, called a minor calyx (plural Several minor calyces unite to form a major In turn, the major calyces join to form the renal pelvis that collects urine and funnels it to theįigure 21.2 The kidney viewed in coronal section.Ģ1.4 Describe the innervation of the kidneys. Each kidney is approximately 11.25 cm (4 in.) long, 5.5 to 7.5 cm (2 to 3 in.) wide, and 2.5 cm (1 in.) thick. The kidneys are located on either side of the vertebral column in the abdominal cavity, between Survey the levels of the twelfth thoracic and the third lumbar vertebrae. Objective describe the anatomy of the kidneys and to trace their embryonic development. Urination is the voiding of urine from the urinary bladder, whereas micturition is the physiological process of urination, which includes nerve impulses and muscular responses. Therefore, because other systems also eliminate wastes and because the kidneys are also involved in functions other than excretory, the term urinary system is a more precise designation.Ģ1.3 Do micturition and urination have the same meaning? Carbon dioxide is eliminated through the respiratory system excessive water, salts, and nitrogenous wastes are eliminated through the integumentary system and digestive wastes (bile) are eliminated through the digestive system. Finally, the kidneys serve as minor endocrine organs (see fig.Ģ1.2 Is the term excretory system appropriate for the urinary system?Īlthough the urinary system has a major excretory function, other body systems are also excretory in nature. It also rids the body of the wastes of metabolism and phagocytosis, in addition to removing foreign chemicals, drugs, and food additives. Specifically, it plays a critical role in regulating the composition of the body fluids (water balance, electrolyte balance, and acid-base balance). Like most body systems, the urinary system is involved in maintaining homeostasis. The urinary system consists of the which form urine the which transport urine to the urinary where it is stored and the which carries urine to the outside body.Ģ1.1 What are the specific functions of the urinary system? Objective describe the components of the urinary system and to state their functions.

Nephron and concentrations of interstital fluid image