Urinary+System

Urinary+System - Chapter 26 The Urinary System • Kidneys,...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 26 The Urinary System • Kidneys, ureters, urinary bladder & urethra • Urine flows from each kidney, down its ureter to the bladder and to the outside via the urethra • Filter the blood and return most of water and solutes to the bloodstream Overview of Kidney Functions • Regulation of blood ionic composition – Na+, K+, Ca+2, Cl- and phosphate ions • Regulation of blood pH, osmolarity & glucose • Regulation of blood volume – conserving or eliminating water • Regulation of blood pressure – secreting the enzyme renin – adjusting renal resistance • Release of erythropoietin & calcitriol • Excretion of wastes & foreign substances External Anatomy of Kidney • Blood vessels & ureter enter hilus of kidney • Renal capsule = transparent membrane maintains organ shape • Adipose capsule that helps protect from trauma • Renal fascia = dense, irregular connective tissue that holds against back body wall allen2e_36_02_li allen2e_36_02_li allen2e_36_03_li allen2e_36_03_li Urinary Bladder • The urinary bladder is a hollow muscular organ situated in the pelvic cavity posterior to the pubic symphysis. • Anatomy and Histology of the Urinary Bladder • In the floor of the urinary bladder is a small, smooth triangular area, the trigone . The ureters enter the urinary bladder near two posterior points in the triangle; the urethra drains the urinary bladder from the anterior point of the triangle (Figure 26.21). allen2e_36_04_li allen2e_36_04_li Histology of Urinary Bladder • 3 layers in wall – mucosa is transitional epithelium & lamina propria • since organ must inflate & deflate • mucus prevents the cells from being contacted by urine – muscularis (known as detrusor muscle) • 3 layers of smooth muscle – inner longitudinal, middle circular & outer longitudinal • circular smooth muscle fibers form internal urethral sphincter • circular skeletal muscle forms external urethral sphincter – adventitia layer of loose connective tissue Blood Vessels around the Nephron...
View Full Document

This note was uploaded on 05/04/2009 for the course BIO bio112 taught by Professor Abidi,tanveer during the Spring '09 term at Middlesex CC.

Page1 / 76

Urinary+System - Chapter 26 The Urinary System • Kidneys,...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online