Welcome to this lesson on the urinary system. Today you are going to be learning about how the body maintains homeostasis of its body fluids. Specifically, you will learn about:
The urinary system helps to maintain homeostasis of extracellular fluids. Remember, extracellular fluids are fluids found on the outside of cells, such as blood. Extracellular fluids, have a tendency to change as your body takes in water and solutes or loses water and solutes. In order to maintain homeostasis, your body has to try and maintain these extracellular fluids at a certain level, concentration, and pH.
The intake of water and solutes comes primarily from food and liquid that is ingested. Intake can also be through respiration or through metabolism. In summation, these are all ways that water and solutes can be added to your system. Water and solutes are primarily lost via urine, feces, sweat, and evaporation.
The kidneys play a really important role in homeostasis of these extracellular fluids by forming urine. Urine is produced and excreted by the body and hormones also play a role in this process of urine formation and extracellular fluid homeostasis.
There are two kidneys where urine is produced and from there you'll have the ureters, urinary bladder, and the urethra. So urine is produced in the kidneys and will move down the ureter to be stored in the urinary bladder, and then is expelled from the body through the urethra.
The kidneys can conserve or excrete fluids as necessary which means they can produce concentrated or diluted urine. If there needs to be more water in extracellular fluid, for example in dehydration, then the kidneys will produce more concentrated urine by holding in more water.
So this lesson has been an overview on the urinary system and how the urinary system contributes to maintaining homeostasis of extracellular fluid. Specifically, you looked at the process of intaking and losing water and solutes, as well as the role of the kidneys & hormones.
Keep up the learning and have a great day!
Source: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR AMANDA SODERLIND
A substance formed by the kidneys and excreted from the body as a means to regulate the composition and volume of extracellular fluids.
Fluid of the body that is contained outside of cells, such as blood.
Organs of the body that produce urine and help to regulate the composition and volume of body fluids.