The excretory system
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Transcript of The excretory system
What is the excretory system?The excretory system is a system that removes excess, unnecessary materials from an organism (i.e. humans),
in order to prevent damage to the body. It is responsible for the elimination of the waste products as well as other liquid and gaseous wastes, as urine and as
a component of sweat and exhalation.
Why is it important?As we have seen, it is important in order to prevent damage to the body:Waste products must be removed from the body. If they are not, they will increase in concentration and may interfere with, or damage cells. Waste products that must be removed include carbon dioxide and urea.
Vocabulary:Waste products- productos de desecho
Interfere with- interferir conDamage- dañar Urea- la urea
Concentration- la concentraciónCells- las células
WATER IN THE BODY
Water is gained• from drinking• from water contained in food• from chemical reactions in the body
Water is lost• as sweat• as water vapour when breathing out• in urine
Urea- the process. Part One• Blood is brought to the kidney in the renal
artery. The kidneys filter the blood and then reabsorb useful materials such as glucose. After it has been purified, the blood returns to the circulation through the renal vein.
Vocabulary:Renal artery- las arterias renalesTo filter- filtrarReabsorb- reabsorberGlucose- la glucosaTo purify- purificarCirculation- la circulaciónRenal vein- las venas renales
Urea- the process. Part Two
Urine is taken from the kidneys to the bladder by the ureters. The bladder stores the urine until it is convenient to expel it from the body.
VocabularyBladder- la vejigaTo store- almacenarExpel- expulsar
What’s the difference?Note that ‘ureter’ differs from the word ‘urethra’.
The ureters are tubes that carry urine from the kidneys to the bladder, whereas the urethra is the tube that carries urine out of the body.
How does it work?
• The skin is made up of an outer layer called the epidermis and an inner layer called the dermis
• The skin contains sweat glands that excrete perspiration through skin pores. Perspiration is made up of wastes (urea), salts, and water.
VocabularySweat glands- las glándulas sudoríparasPores- los porosEpidermis- la epidermisDermis- la dermis
https://www.youtube.com/watch?v=TZMJeZL-BVg
A VIDEO ON THE URINAL SYSTEM
QUIZ!
http://www.softschools.com/quizzes/biology/excretory_system/quiz889.html