Secretion and Effects of Waste Products
Cellular respiration takes place in the cristae of the mitochondria within cells. Depending on the pathways followed, the products are dealt with different ways.
CO2 is excreted from the cell via diffusion into the blood stream, where it binds with hemoglobin in red blood cells, is carried to the lungs, and exhaled.
H2O also diffuses out of the cell into the blood stream, from where it is excreted in the form of perspiration, water vapor in breath, or urine from the kidneys. Water, along with some dissolved solutes, are removed from blood circulation in the nephrons of the kidney and eventually excreted as urine.
The products of fermentation can be processed different ways, depending on the cellular conditions.
Lactic acid tends to accumulate in the muscles, which causes pain of the muscle and joint as well as fatigue. It also creates a gradient which induces water to flow out of cells and increases blood pressure. Research suggests that lactic acid may also play a role in lowering levels of potassium in the blood. It can also be converted back to pyruvate or converted back to glucose in the liver and fully metabolized by aerobic respiration.
Read more about this topic: Cellular Waste Product
Famous quotes containing the words effects, waste and/or products:
“Like the effects of industrial pollution ... the AIDS crisis is evidence of a world in which nothing important is regional, local, limited; in which everything that can circulate does, and every problem is, or is destined to become, worldwide.”
—Susan Sontag (b. 1933)
“Flushed with new life, the crowd flows back again:
And all is tangled talk and mazy motion—
Much like a waving field of golden grain,
Or a tempestuous ocean.
And thus they give the time, that Nature meant
For peaceful sleep and meditative snores,
To ceaseless din and mindless merriment
And waste of shoes and floors.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“But, most of all, the Great Society is not a safe harbor, a resting place, a final objective, a finished work. It is a challenge constantly renewed, beckoning us toward a destiny where the meaning of our lives matches the marvelous products of our labor.”
—Lyndon Baines Johnson (1908–1973)