The major function of the contractile vacuole of amoeba is osmoregulation. The solute concentration found in the cell of amoeba's cytoplasm is more than the solute concentration in the freshwater that surround the external part of the organism, thus, water enter the cell through osmosis. The contractile vacuole collect the excess water and expel it through an opening in the cell membrane. By doing this, the contractile vacuole maintains the water balance in amoeba. This how the contractile vacuole normally operate.
In a situation where amoeba is placed in seawater, then water from the cell cytoplasm will rush out of amoeba cell, because of the higher salt content of the surrounding medium. The contractile vacuole will respond to the situation by increasing its contraction and pumping water out the cell in an accelerated manner, this will lead to the shrinking of the cell.
The same way we never inject a full bag of anything quickly and intravenously. Your body would not be able to compensate for the amount of the substance. Alcohol or more importantly the Ethanol or Ethyl Alcohol in alcoholic beverages is the active ingredient of such beverages. It is also a drug called a CNS (Central Nervous System) depressant which means it is in the same class category of Opioids (Such as Heroin and Morphine) and Barbiturates (Rophynol). Your body processes alcohol via the liver, as it is also considered a toxin. By consuming a massive amount of alcohol without spacing it out, you will overload your system, not only literally overwhelming your liver and causing Alcohol Poisoning, but you also can go into a state similar to a Heroin overdose.
Explanation:
The higher the volume of water in a stream, the higher its speed and the wide its size and shape which ensures a proportionate flow rate.
To quantify how the speed of stream, we use the quantity, discharge in hydrology;
Discharge is the volumetric rate of water flow past a point at a particular time.
Discharge = 
- We see that discharge is directly proportional to the volume of water in a stream.
- It is inversely proportional to the time taken.
- We know that volume is the amount of space occupied by a body. It is function of its size and shape.
- A big water body that is deeper, wider and longer will have more wate and a greater discharge.
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