Biology
Structural Organization in Animals Solutions
nan. Body?
Carbon dioxide (CO2)
Aerobic respiration of glucose
in all cells
Digestion of proteins, urea is
produced by the liver after
digestion
Urea & water
Salts & Minerals
Cellular Activities in all cells
Remember, waste is produced in every one of your cells. The blood is responsible for transporting (moving)
waste from your cells to the correct organ for excretion. For example, as blood passes through blood vessels in
your legs, it picks up all the CO2 produced by those cells and carries it to the lungs so it can be excreted out. As
blood passes through blood vessels in your intestines, it absorbs the nutrients, but is also absorbs urea and
brings it to the urinary system to be excreted. So the blood is like a subway system of the body - it picks up
passengers (wastes & nutrients) and takes them to where they need to be. How do the nutrients & wastes get
into and out of the blood? Blood vessels cannot open up to let nutrients and wastes in - the blood would leak
out into the body if that happened. Nutrients and wastes move into and out of the blood vessels by the process
of diffusion - going from where they are highly concentrated to where they are less concentrated.
14. How does the blood help you carry out the life function of excretion?
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