CHAPTER 13
글쓴이: 신민철
이 책에서 모르는 영어단어나 모르는
문장이 있다면, 글쓴이 (신민철) 한테
물어봐도 된다. 연락만 해라, 뭐든지
다 알려줄 수 있다.
이 책은 IGCSE CIE Extended Syllabus
를 공부하는 학생들을 위한 책이다.
시험 페이퍼를 따지면 papers 2, 4, 6
이다.
Excretion
Excretion is the removal of waste products of metabolism from their
bodies. All living cells have many metabolic reactions going on inside them.
For example, the reactions of respiration provide energy for the cell.
Urea
Urea is a waste product that is produced in the liver in humans. As urea is
toxin, too much urea in the blood is toxic. Urea is removed from the blood
by the kidneys.
The Urea is removed from the blood by the kidneys. The kidneys also
remove excess water and excess ion from the blood, and produce urine.
The urine flows down the ureters and into the bladder, where it is stored.
The urine flows out of the body through the urethra.
Vena Cava
Renal vein
kidney
A human excretory system.
Renal artery
Ureter
Bladder
Urethra
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