What Is Excretion?
Excrement refers to urine sweat, not feces
Feces
- Chinese name
- Feces
- Foreign name
- excretion
- Brief introduction
- Includes urination and defecation
- Including
- Carbon dioxide, excess water
- Excrement refers to urine sweat, not feces
- Although the "excretion" referred to in daily life includes urination and defecation, biologically, excretion only includes the formation of urine, and feces are not part of excretion. The correct name is-exclusion.
- Scientifically, to be precise, excretion is not limited to excretion of body waste. The lungs also excrete carbon dioxide and excess water, urine excretes nitrogenous compounds, part of the salt and moisture, and sweat glands in the skin expel part of the water and salt. Human excretion of undigested food is not really excretion , because the undigested food never passes through the cells of the human body , so it is not a metabolic waste .
- Therefore, the above carbon dioxide, excess water, nitrogen compounds (also called urine), salt, etc. are all excretions.
- In fact, not only humans have excreta, plants also excrete. There are also excreta: when plants perform photosynthesis, the leaves of the plants release unwanted oxygen. Some plants store solid waste in cells. For example, garlic deposits unused calcium oxalate crystals as excreta in garlic.