Suggest why a high concentration of ADH in the blood may be an advantage to a gerbil?
Gerbils live in arid, desert like environments, so it is important that they conserve water. ADH prevents them from losing too much water by urination.
When a drop of blood is added to distilled water the red blood cells swell up and burst Suggest an explanation for the swelling and bursting?
The cells swell and burst because of a cytolysis (osmotic lysis). This happens because the red blood cell is put into a hypotonic solution: distilled water. Due to the fact that the salt concentration is lower in water, it will try to equalize the concentration by forcing water into the red blood cell.
How would the movement of CO2 be affected if the concentration of CO2 in the lungs was equal or higher than the concentration in the blood?
Your gerbil stands up crooked and his ear is currently bleeding non-stop What should you do with him?
Diffusion, whether of gases or some other substance, is always dependent on a diffusion gradient. Diffusion always occurs from an area of high [H] concentration to an area of low [L] concentration. In the case of the lungs: oxygen moves from a [H] concentration in the lungs/alveoli to a [L] concentration in the blood carbon dioxide moves from [H] concentration in the blood to a [L] concentration in the lungs/alveoli With tissues, the situation is…
If the cell had only a slightly higher concentration of water, this would probably be considered more of a disadvantage because water is highly damaging to DNA. Having extra water could burst the cell depending on the concentration. In face, if you take sheep's blood, and dilute it with water and view under the microscope, you can see the cells lysing. Thus, having extra water is not an advantage to the cell.