About fishes and frogs

Fishes and Frogs out of water

( https://www.youtube.com/watch?v=ZUsARF-CBcI )

Q: What are the differences and similarities in the strategies that they employ?

Similarities
When there is hardly any water, both the lungfish and the desert frog will entomb themselves underground. The lungfish and the desert frog also use a form of outer covering that they encase themselves in, dried mucus for the lungfish and waterproof skin layers for the desert frog.

Differences
One difference is that the desert frog contains a water supply in its bladder for use in emergencies, while the lungfish, in bad conditions, shuts itself down completely until conditions improve. Also, the lungfish's swim bladder can form a crude lung for it to use as the lungfish does not have any lungs, while the desert frog does not do so.
The Thorny Devil gets the moisture it needs from consuming black ants, hence it can survive for years without drinking water. It also obtains water through capillary action, where its skin sucks up the water until it reaches the eyes and mouth, and a network of channels direct the water to its mouth. This completely differs from the functions of the other two animals.

Q: From what you understand from homeostasis so far, how do you think these strategies allow for homeostasis to take place?

Homeostasis occurs when there is a controlled stability of the internal environment of cells and tissues.
The lungfish's and desert frog's encasing itself with a covering prevents loss of water, hence with no water input or output, homeostasis cannot occur. When the Thorny Devil obtains water through its skin, homeostasis occurs as it is getting a sufficient amount of water that it needs.

How does the body regulate water?

Regulating water input and output of the human body involves the process of homeostasis, and organs such as the kidney.
Water input to our bodies comes from drinking fluids or consuming moist foods. Water is also gained as a byproduct of cellular respiration, while water output from our bodies comes from sweating through our skin, exhaling, faeces and urinating.
If a person does not gain much water to their body, the amount of water output will be decreased such as to maintain a water balance in the body. In our bodies, the water concentration among other things must be maintained as constant as possible.
The kidney plays an important role in regulating water in our body, as it controls the water concentration in blood plasma and produces urine. As our blood passes though our kidneys, molecules such as water, glucose, urea and salt are filtered out. Glucose, as well as sufficient water and salt for the body will be reabsorbed into our blood, leaving the remaining water, salt and urea or urine. When the water level of our blood plasma is high, less water will be reabsorbed back into our blood, and the kidney will produce more diluted urine. Likewise, when the water level of our blood plasma is low, more water will be reabsorbed back into our blood and the kidney will produce more concentrated urine.