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Chapter 26, part 4

Chapter 26, part 4. The Urinary System. SECTION 26-6 Urine Transport, Storage, and Elimination. Urine production ends with fluid entering the renal pelvis. Rest of urinary system transports, stores and eliminates Ureters Bladder Urethra.

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Chapter 26, part 4

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  1. Chapter 26, part 4 The Urinary System

  2. SECTION 26-6Urine Transport, Storage, and Elimination

  3. Urine production ends with fluid entering the renal pelvis • Rest of urinary system transports, stores and eliminates • Ureters • Bladder • Urethra

  4. Figure 26.17 A Radiographic View of the Urinary System Figure 26.17

  5. The ureters • Pair of muscular tubes • Extend from renal pelvis to the bladder • Peristaltic contractions force urine toward the urinary bladder

  6. The urinary bladder • Hollow, muscular organ • Reservoir for the storage of urine • Contraction of detrusor muscle voids bladder • Internal features include • Trigone • Neck • Internal urethral sphincter • Ruggae

  7. Figure 26.19 Organs for the Collection and storage of Urine Figure 26.19a

  8. Figure 26.19 Organs for the Collection and storage of Urine Figure 26.19b

  9. Figure 26.19 Organs for the Collection and storage of Urine Figure 26.19c

  10. The urethra • Extends from the urinary bladder to the exterior of the body • Passes through urogenital diaphragm (external urinary sphincter) • Differs in length and function in males and females

  11. Figure 26.20 The Histology of the Organs that Collect and Transport Urine Figure 26.20a

  12. Figure 26.20 The Histology of the Organs that Collect and Transport Urine Figure 26.20b, c

  13. Micturition reflex and urination • Urination coordinated by micturition reflex • Initiated by stretch receptors in wall of bladder • Urination requires coupling micturition reflex with relaxation of external urethral sphincter

  14. Figure 26.21 The Micturition Reflex Figure 26.21

  15. Figure 26.21 The Micturition Reflex Figure 26.21

  16. SECTION 26-7Aging and the Urinary System

  17. Changes with aging include: • Decline in the number of functional nephrons • Reduction of GFR • Reduced sensitivity to ADH • Problems with the micturition reflex

  18. You should now be familiar with: • The components of the urinary system and their functions • The location and structural features of the kidneys • The structure of a nephron, and the processes involved in the formation of urine • The normal characteristics, composition, and solute concentrations of a representative urine sample

  19. You should now be familiar with: • The factors that influence filtration pressure and the rate of filtrate formation • The types of transport mechanisms found along the nephron • How antidiuretic hormone and aldosterone levels influence the volume and concentration of urine

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