The Urinary System: Anatomy and Physiology: Introduction (01:56)
The urinary system filters and eliminates waste products collected by the circulatory system. It also monitors blood pressure, blood volume, pH, and sodium, potassium, chloride, and calcium levels. The kidneys, ureters, urinary bladder, and the urethra make up the urinary system.
The Kidneys (06:10)
Nephrons within the cortex begin urine production— the papilla at the tip of the renal pyramids projects the urine into the minor calyx. Learn the stages of filtration: absorption, reabsorption, and secretion. The substances present in urine include sodium, potassium, chloride, urea, creatinine, ammonia, and uric acid.
Ureters Bladder Urethra and Micturition (03:12)
Peristalsis in the ureters pushes the urine from the kidney to the bladder. Nerves in the bladder send messages to the cerebral cortex when urine levels rise. Micturition occurs when an individual relaxes the external urethral sphincter.
The Regulatory Function of the Kidneys (04:06)
The kidney participates in whole-body homeostasis by regulating blood volume, ion balance, and controlling the pH levels of the bloodstream. If sodium levels in the bloodstream are incorrect, the kidneys will secrete aldosterone or antidiuretic hormone (ADH).
Credits: The Urinary System: Anatomy and Physiology (00:14)
Credits: The Urinary System: Anatomy and Physiology
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