2006-09-25 09:03:51 · 16 answers · asked by Diana K 1 in Science & Mathematics ➔ Biology
Because they all are excretory organs.
2006-09-26 14:27:22 · answer #1 · answered by moosa 5 · 0⤊ 0⤋
I presume you mean they are all organs. This is because they each perform a specialised function - kidneys filter the blood to remove waste products, lungs are responsible for respiration and skin has several functions. These are forming a barrier against infection, excretion of urea (in small amounts: this why sweat smells horrible), helps regulate body temperature, provides sensory information about the outside world through touch (nerve endings in skin) and yes, it keeps your insides in!
Skin is pretty amazing stuff.
2006-09-25 09:19:27 · answer #2 · answered by tagette 5 · 0⤊ 0⤋
They all act as filters eliminating wastes. Skin expells sweat as waste, also excess salt. Lungs filter through chemicals and kidneys are also filters. All three are helping to keep our systems clean so that we can function properly.
2006-09-25 09:08:00 · answer #3 · answered by LothLorien 2 · 0⤊ 0⤋
i think its because they all play a role in EXCRETION, along with the liver and the colon.
skin gets rid of some urea with water, lungs of carbon dioxide and the kidneys of urea, water...not really sure what else...
2006-09-25 09:28:37 · answer #4 · answered by lola* 1 · 0⤊ 0⤋
They are all organs. They each provide a very specific function.
2006-09-25 09:32:07 · answer #5 · answered by Vince M 7 · 0⤊ 0⤋
they are all organs. Yes, the skin is an organ.
2006-09-25 09:08:14 · answer #6 · answered by Felix Q 3 · 1⤊ 0⤋
I'm assuming they are considered same class because they are all organs that can regrow themselves :)
2006-09-25 09:06:39 · answer #7 · answered by Anonymous · 0⤊ 0⤋
they are all considered organs that clean as well ? First lines of defence?
2006-09-25 09:07:25 · answer #8 · answered by Shannon Day 1 · 0⤊ 0⤋
Hi. Could it be capillary based exchange of materials?
2006-09-25 09:07:22 · answer #9 · answered by Cirric 7 · 0⤊ 0⤋
Because they are all organs.
2006-09-25 09:06:29 · answer #10 · answered by bc.grown 3 · 1⤊ 0⤋