CATDOLL : CATDOLL: How do fish regulate osmotic pressure? How do fish regulate osmotic pressure?

1. How do fish regulate osmotic pressure?

Fish live in seawater environments with higher osmotic pressure than their body's internal osmotic pressure, or in freshwater environments with lower osmotic pressure than their body's internal osmotic pressure, and adapt to the external environment's osmotic pressure in different ways.

In the changing environmental osmotic pressure, its osmotic pressure regulating function also changes to adapt to the changing environmental osmotic pressure.

Mainly regulates osmotic pressure through skin, gills, and kidneys

2. How do fish regulate osmotic pressure?

The fish's swim bladder, commonly known as the fish bubble, contains air. By regulating the contraction and expansion of the swim bladder muscle, the fish can adjust its body density and rise or sink in the water.

3. How do inorganic salts maintain osmotic pressure and pH value?

Osmotic pressure~~~The concentration of inorganic salts affects the distribution of water molecules inside and outside the cells~~~and generally regulates the osmotic pressure. When the concentration of extracellular fluid is greater than that of intracellular fluid, it manifests as water loss, and vice versa, it manifests as water absorption.

pH value~~ carbonate, bicarbonate, hydrogen phosphate, dihydrogen phosphate of inorganic salts can help adjust the pH value of the internal environment. Even if the external environment changes suddenly, the internal environment will not change too quickly, and there will be a buffer space.

4. How do freshwater fish and saltwater fish maintain osmotic pressure in their bodies?

The osmotic pressure in freshwater fish is relatively high, which means that water will continuously flow into the body from outside the body through the body surface, oral mucosa, etc., so freshwater fish must constantly excrete water through urination.

There are two ways for saltwater fish to maintain osmotic pressure. One is to excrete excess salt from the body; the other is to increase the osmotic pressure in the body and maintain the same osmotic pressure as seawater.