MYTUTOR SUBJECT ANSWERS

854 views

how is urine produced in the kidney?

The first step of urine formation is ultrafiltration. Blood passes through a network of capillaries in the kidney called the glomerulus. It is filtered into the Bowman’s capsule (the first part of the nephron) through a fine membrane which acts like a sieve. Blood cells and proteins are too big to pass through the membrane so they remain in the blood, but everything else – water, ions, waste produce (urea) and glucose passes into the nephron. The solution entering the nephron is called the ultrafiltrate.

The next step is selective reabsorption. It is important that waste products (urea) are excreted from the body in urine while substances your body needs – ions, water and glucose – remain in the blood so they can be used. To achieve this, most ions and all glucose is pumped back into the blood from the nephron. This mostly happens in the first part of the nephron, the proximal convoluted tubule. Everything that is not pumped back into the blood moves into the bladder down the ureters as urine and is excreted.

Lois C. Uni Admissions Test .UKCAT. tutor, Uni Admissions Test -Medic...

2 years ago

Answered by Lois, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

221 SUBJECT SPECIALISTS

£24 /hr

Naomi S.

Degree: Medicine (Bachelors) - Trinity College Dublin University

Subjects offered:Biology, Music+ 4 more

Biology
Music
Maths
Human Biology
Chemistry
-Medical School Preparation-

“*Available to teach exam revision sessions immediately.* I'm a medical student at Trinity College Dublin.”

£20 /hr

Shivani M.

Degree: Medicine (Bachelors) - Exeter University

Subjects offered:Biology, Maths+ 4 more

Biology
Maths
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Medical School Preparation-

“I graduated with 5 A-levels last year and now study medicine at Exeter. I have mentored GCSE maths students for the last 2 years. I would love to hear from you!”

£24 /hr

Pooja D.

Degree: Medicine (Bachelors) - Birmingham University

Subjects offered:Biology, Science+ 6 more

Biology
Science
Physics
Maths
Chemistry
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“I have tutored for the past 4 years and have gathered many ways of teaching concepts to students in a way that is easily-digestible and understandable. ”

About the author

Lois C.

Currently unavailable: no new students

Degree: Medicine (Bachelors) - St. George's University

Subjects offered:Biology, Chemistry+ 2 more

Biology
Chemistry
.UKCAT.
-Medical School Preparation-

“Second year medical student. I would love to help you improve with GCSE/A Level biology or chemistry. I'm also happy to help with any part of your medical school application!”

MyTutor guarantee

|  2 completed tutorials

You may also like...

Other A Level Biology questions

What are enzymes and how do they work?

What features of the nephron allow ultrafiltration to take place in the kidneys?

Explain the formation of a new species

What is the function of the myelin sheath?

View A Level Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok