Exam (elaborations)
CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
- Course
- Institution
CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
[Show more]
Seller
Follow
lennyjast
Reviews received
Content preview
CBSE Quick Revision Notes (Class-11 Biology)CHAPTER-19 EXCRETORY PRODUCTS AND THEIR ELIMINATION
• Elimination of metabolic wastes products from the animal body to regulate the composition
of body fluids and tissues is called excretion. These wastes products includes ammonia, uric
acid, urea, carbon dioxide and ions like Na+, K+, Cl- and phosphates and sulphate.
• Ammonia is the most toxic and uric acid is the least toxic. The process of removing ammonia
is called ammonotelism and organisms that excrete ammonia are called ammonotelic
(bony fishes, aquatic amphibians and insects).
• The organism that release urea as nitrogenous wastes are called ureotelic (mammals,
terrestrial amphibians). The organism that excretes uric acids are called urecotelic
(reptiles, birds and land snails).
Animals Excretory organs
Flat worms, some annelids and cephalochordates. Protonephridia or flame cells.
Earthworms and annelids Nephridia
Insects including cockroaches Malpighian tubules
Mammals Kidney
Human Excretory System
Human excretory system consists of
i. A pair of kidneys
ii. A pair of ureters
iii. A urinary bladder
iv. A urethra
Kidneys are reddish brown bean shaped structure
situated between last thoracic and lumber vertebra.
Each with a notch on its inner side called hilum
through which ureter, blood vessels and nerves
enter.
Inside the hilum has broad funnel shaped space called
renal pelvis with projection called calyces.
Inside the kidney are two zone- outer cortex and inner
medulla. Medulla is divided into medullary pyramids
projecting into calyx.
Cortex extends between medullary pyramids as renal
column called Columns of Bertini.
The functional unit of kidney is nephron. Each kidney contains about one million nephrons.
Each nephron had two parts- the glomerulus and renal tubules. Glomerulus is the tuft of
capillaries formed by afferent arteriole. Blood from glomerulus is carried away by efferent
arteriole.
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 lennyjast. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.60. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now