Anatomy of the Urinary System AOHS Foundations of Anatomy and Physiology II Lesson 19 Anatomy of the Urinary System Copyright © 2014‒2016 NAF. All rights reserved.

By the end of this presentation you will know: The organs of the urinary system Special features of cells in the bladder The functions of the urinary system The differences between the male and female urinary system

The urinary system is the body’s most important mechanism for homeostasis The urinary system regulates: How much water to get rid of How much blood you have Blood levels of electrolytes The chemical environment surrounding your cells What are some electrolytes you know of that your body has to regulate through homeostasis?

The urinary system is like a waste treatment plant for the fluids in your body This central cleaning facility filters out unwanted or excess materials from your blood. List the things found in blood that will go through this filtering system.

What food gets its name from being shaped like a kidney? The kidneys filter blood and produce urine The kidneys are the active organ of the urinary system. You have two kidneys, one posterior to the stomach and one posterior to the liver. Each kidney is about the size of an adult’s fist. What food gets its name from being shaped like a kidney?

Renal means “associated with the kidney” The large blood vessels going into the kidneys are the renal artery and vein. A loss of kidney function is often referred to as renal failure. What do you think adrenal gland and its hormone, adrenaline, mean?

The inside of a kidney has many tissue structures The renal cortex forms a shell around the inner part of the kidney. The renal medulla is a half-circle containing triangular tissue sections. These triangles are called medullary pyramids. What gland is also made of a cortex and a medulla?

Nephrons, the structures that make urine, are found in the renal cortex and medulla Nephrons create urine by separating and removing wastes, electrolytes, and excess water from the blood. By bringing these substances into homeostatic balance and leaving what’s not needed outside of the bloodstream, urine is created.

At the base of the renal pyramids, tubules join together to make the beginning of the ureter Ureters are muscular tubes that use peristalsis to move urine from the kidneys toward the bladder.

Each ureter empties urine into the urinary bladder The urinary bladder holds about 20 ounces. Its inner wall is made of cells that can change shape, allowing the bladder to stretch.

Urine leaves the body through the urethra Like the anus, the urethra has two sphincters, the inner one smooth muscle and the outer one voluntary skeletal muscle. The length of the urethra is different in males and females.

Urine is so much more than yellowish water Substances in urine can tell doctors a lot about what’s happening in a person’s body. A woman’s urine can indicate whether she is pregnant or not. Pregnant women get regular urine tests to check for proteins that can indicate complications. What does it say about the kidney’s treatment of drugs and anabolic steroids that they can be detected in a urine test?