100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary Excretion - IGCSE Biology Complete Notes £4.07   Add to cart

Summary

Summary Excretion - IGCSE Biology Complete Notes

 13 views  0 purchase

Summary study book Cambridge IGCSE Biology 3rd Edition of D. G. Mackean, Dave Hayward (Excretion) - ISBN: 9781471841439 (FULL Notes)

Preview 1 out of 3  pages

  • No
  • Excretion
  • July 4, 2024
  • 3
  • 2021/2022
  • Summary
book image

Book Title:

Author(s):

  • Edition:
  • ISBN:
  • Edition:
All documents for this subject (1)
avatar-seller
cindyong
excretion
·
excretion -
removal of toxic substances ,
waste products of metabolism processes and substances in excess of



requirements in the body -
defecation excretion


·
skin -
removes substances through sweat / containing water , urea and salts (


lungs removes CO2 & water vapour
removal of amine
groups
·
liver assimilation of amino acids /amino acids -
> proteins)

·
deamination (break down of the
nitrogen-containing parts of excess amino acids) to produce urea



·
urea is excreted in the form of urine/mineral salts and urea dissolved in H2O
breaks down alcohol to form acetaldehyde
·
alcohol dehydrogenase

breaks down acetalhyde to form acetate
·
aldehyde dehydrogenase




factors affecting vol . and conc . of urine-


·

temperature and exercise


·
not temperatures and exercise leads to increased dehydration :
higher conc . and lower vol.




me
·
water Intake

-



·

higher hydration : lower conc . and higher vol .




of the blood
kidney regulate water content
·




·
excrete urea and other waste materials


·
ureter -
carries vrine from the kidney to the bladder



·
bladder-sac that stores urine and allows urination to be controlled


·

sphincter muscle -
used to control exit of urine



-
-return-cust that transmits crine from the bloder to


·

nephrons functional unit of the Kidney

·
consists of renal corpuscle and renal tubules


·
renal corpuscle blood-filtering system of the Kidney (glomerulus and Bowman's capsule (
·
renal tubules
Conveys urine from the glomerull to the renal pelvis

·
water and salts are reabsorbed into the blood along the way


·
ADH (antidiuretic hormone) -

a hormone produced in the brain that makes the collecting duct more permeable to water




reactions that take place in the cells




larger molecules from smaller constituent parts
·
anabolic reaction -
Synthesizes


catabolic reactions breakdown of molecules for energy (liver
organic organ (
-

is an example
·

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller cindyong. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £4.07. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73216 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£4.07
  • (0)
  Add to cart