Class sharing on an example of cell that has homeostasis and is achieved by different transport mechanisms.
- Root hair cell / Plant root
- Villi cell / small intestines
Sunday, 2 February 2014
Video Viewing: BBC Worldwide Fish and Frogs Living Out of Water
What are the differences or similarities in the strategies that they have employed?
The lung fish and the desert frog burrows itself into the soil/mud to escape the drought and it coats itself with the mucus and the skin respectively to create a “skin” that is impenetrable to prevent water loss while the thorny devil is able to use capillary action to suck up water that is left on the floor.
From what you understand about Homeostasis so far, how do you think these strategies allow for homeostasis to occur?
These strategies allow for either prevention of water loss or replenishment of lost water. The lung fish and the desert frog coats itself with mucus and sheds dead skin respectively to reduce the total amount of water loss so that there is a constant equilibrium while the thorny devil replenishes the water it has lost by sucking it up through it skin as well as eating black ants that have water content in them.
Sunday, 19 January 2014
How does our body perform water regulation?
The kidneys maintain our water balance by producing urine of different concentrations when the water level of our plasma is low, more water is reabsorbed back into the blood and the urine becomes more concentrated. When the water level of our blood plasma is high, less water is reabsorbed back into the blood and our urine is more dilute.
The concentration of our urine is controlled by a hormone called ADH. ADH is produced by pituitary gland situated below the brain. The pituitary gland monitors the concentration of the blood plasma. It releases ADH into the bloodstream, which travels in the blood to the kidneys.
The more concentrated the plasma (less water), the more ADH is released into the blood. When ADH reached the kidneys, it causes them to reabsorb more water. This keeps more water in the blood and produces more concentrated urine.
The more dilute the plasma (more water), less ADH is released into the blood. This allows more water to leave the kidneys, producing more dilute urine.
This method of control is called negative feedback.
The concentration of our urine is controlled by a hormone called ADH. ADH is produced by pituitary gland situated below the brain. The pituitary gland monitors the concentration of the blood plasma. It releases ADH into the bloodstream, which travels in the blood to the kidneys.
The more concentrated the plasma (less water), the more ADH is released into the blood. When ADH reached the kidneys, it causes them to reabsorb more water. This keeps more water in the blood and produces more concentrated urine.
The more dilute the plasma (more water), less ADH is released into the blood. This allows more water to leave the kidneys, producing more dilute urine.
This method of control is called negative feedback.
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