Chapter 12 Renal and Acid-Base Physiology – Kidney Maintains constancy of ECF volume (extra cellular fluid volume) Absorption those substances come back to blood vessel capillary – Excretion means releases into urine elimination from body – Kidney produces urine which avoids high level of blood volume and excretes extra fluid from body as urine But first, renal system has filtration Water filtration, the capillary again absorbs many ions, substances, glucose, and water Structure of kidney Has two parts cortex Renal medulla in center There are millions of nephrons and capillary surrounds nephrons Nephron Consists of nephron and renal tubule Glomerulus Glomerular capillary network emerges from afferent arteriole Renal tubule Made of… Proximal tubule Loop of Henle Distal tubule Collecting ducts Blood supply Renal artery enters kidney which is branch of aorta Becomes interlobar artery becomes arcuate artery then cortical radial artery. After radial, becomes efferent arterial Then becomes glomerular capillary which is inside bowman capsule This becomes afferent arterial then peritubular capillary which surrounds tubules of nephrons. Peritubular becomes renal venule then renal vein This releases content into inferior vena cava Body fluids Total body water (TBW) 60% of body water – 40% inside cell intracellular fluid – 20% in blood vessels extracellular – TBW Highest in newborns
Chapter 12 – Renal and Acid-Base Physiology Kidney Maintains constancy of ECF volume (extra cellular fluid volume) Absorption those substances come back to blood vessel – capillary Excretion means releases into urine – elimination from body Kidney produces urine which avoids high level of blood volume and excretes extra fluid from body as urine But first, renal system has filtration Water filtration, the capillary again absorbs many ions, substances, glucose, and water Structure of kidney Has two parts cortex Renal medulla in center There are millions of nephrons and capillary surrounds nephrons Nephron Consists of nephron and renal tubule Glomerulus Glomerular capillary network emerges from afferent arteriole Renal tubule Made of… Proximal tubule Loop of Henle Distal tubule Collecting ducts Blood supply Renal artery enters kidney which is branch of aorta Becomes interlobar artery becomes arcuate artery then cortical radial artery. After radial, becomes efferent arterial Then becomes glomerular capillary which is inside bowman capsule This becomes afferent arterial then peritubular capillary which surrounds tubules of nephrons. Peritubular becomes renal venule then renal vein This releases content into inferior vena cava Body fluids Total body water (TBW) – 60% of body water 40% inside cell – intracellular fluid 20% in blood vessels – extracellular TBW Highest in newborns
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