Significance of Urea Excretion Discussion Essay

Tubular reabsorption: Nephrons are the kidney’s functional units, and around a million of them are present in each kidney. They are an essential part of the excretory system and are responsible for urine formation. The afferent arteriole is responsible for bringing in the blood to the head of the glomerulus, while the efferent arteriole transports the blood back into circulation. The vasa recta extend the efferent arteriole and help in the re-absorption and secretion of certain substances to and from the nephron and circulation. The four main steps for water excretion are filtration, reabsorption, secretion, and excretion.

Filtration: The most significant part of the nephron that carries out filtration is the renal corpuscle. The glomerular filtrate enters the capsule by an afferent arteriole, and the filtration happens through the ultra filtration barrier. Particles with a size of less than 1.8\text{ nm}1.8 nm (\text{N}{{\text{a}}^{+}}Na
and \text{Cl}^{-}Cl
) pass freely, whereas particles of more than 3.6\text{ nm}3.6 nm (hemoglobin) are not filtered. The bottom layer is composed of the endothelium, the middle layer is the basement membrane, and the outer layer has podocytes which are part of the Bowman’s capsule.

Don't use plagiarized sources. Get Your Custom Essay on
Significance of Urea Excretion Discussion Essay
Just from $9/Page
Order Essay

Reabsorption: In this process, water and solutes move from the nephron back into the blood circulation. This process is mainly carried out by the proximal convoluted tubule (PCT), distal convoluted tubule (DCT), the loop of Henle (LOH), and collecting tube (CT). The PCT absorbs \text{Na}^{+}Na
, \text{Cl}^{-}Cl
, {{\text{K}}^{+}}K
, glucose, amino acids, and water. The descending LOH reabsorbs water while the ascending loop reabsorbs \text{Na}^{+}Na
, \text{Cl}^{-}Cl
, {{\text{K}}^{+}}K
. The DCT is responsible for the reabsorption of \text{Na}^{+}Na
, \text{Cl}^{-}Cl
, {{\text{K}}^{+}}K
, \text{Ca}^{2+}Ca
, \text{Mg}^{2+}Mg
, \text{HCO}^{3-}HCO
and the CT reabsorbs \text{Na}^{+}Na
, \text{Cl}^{-}Cl
, water, and urea.

Secretion: Here, the water and solute particles move from the blood circulation into the nephron. The PCT secretes creatinine, drugs, and H+ ions. The DCT is responsible for the secretion of {{\text{H}}^{+}}H
and {{\text{K}}^{+}}\text{ ions}K

Excretion: The urine formed by the above process then passes into the urinary bladder through the ureter. Here, the urine is stored temporarily and is released outside by the urethra with the help of a circular muscle called the sphincter muscle.

ADH and water absorption
During urine excretion, the nephrons absorb a small quantity of urea. Therefore, the concentration of urea increases as the water moves up the nephrons. When it reaches the collecting tube, the concentration is very high and can pose several problems. Antidiuretic hormone plays a vital role in water reabsorption. The ADH is responsible for reabsorbing excess water out of the fluid in the collecting tubule.

The ADH activates the water channels in the collecting duct, allowing water transport into the high concentration area (medulla). However, since urea is a solute, it resists moving out of the collecting tubule. It adds solute and concentrations to the collecting duct, making it more difficult to remove the water. To counter this, ADH releases aquaporin into the collecting duct for water reabsorption and activates urea channels in the collecting duct. These urea channels allow urea to diffuse into the medulla.

Significance of Urea Excretion
The kidney filters about 1.2\text{ L}1.2 L of blood every minute in the human body. The blood contains urea, a waste product of the excess protein in the body. The average amount of urea in a healthy individual is 7-20\text{ mg/dL}7−20 mg/dL. It is vital to eliminate urea since excess levels of urea can be toxic for the body. In addition, the kidney is responsible for filtering out the urea, excess water, and ions.

Each kidney comprises about a million microscopic units called nephrons. As the blood flows in the kidney, the renal artery splits into smaller arteries and eventually becomes capillaries. Each capillary then forms a glomerulus which has tiny pores in it to squeeze out the blood. The filtrate comprises water, urea, amino acids, glucose, and ions.

As the filtrate passes along, anything the body needs to keep is taken back in the blood by selective re-absorption.

However, since urea is a waste product, the blood carries it through the nephron, eventually reaching the collecting duct.

This structure transports urea to the pyramid area of the kidney, which collects all the waste from the nephrons.

The urine now flows down the ureter, and the body stores it in the urinary bladder till the person feels the urge to urinate.


Get Professional Assignment Help Cheaply

Buy Custom Essay

Are you busy and do not have time to handle your assignment? Are you scared that your paper will not make the grade? Do you have responsibilities that may hinder you from turning in your assignment on time? Are you tired and can barely handle your assignment? Are your grades inconsistent?

Whichever your reason is, it is valid! You can get professional academic help from our service at affordable rates. We have a team of professional academic writers who can handle all your assignments.

Why Choose Our Academic Writing Service?

  • Plagiarism free papers
  • Timely delivery
  • Any deadline
  • Skilled, Experienced Native English Writers
  • Subject-relevant academic writer
  • Adherence to paper instructions
  • Ability to tackle bulk assignments
  • Reasonable prices
  • 24/7 Customer Support
  • Get superb grades consistently

Online Academic Help With Different Subjects


Students barely have time to read. We got you! Have your literature essay or book review written without having the hassle of reading the book. You can get your literature paper custom-written for you by our literature specialists.


Do you struggle with finance? No need to torture yourself if finance is not your cup of tea. You can order your finance paper from our academic writing service and get 100% original work from competent finance experts.

Computer science

Computer science is a tough subject. Fortunately, our computer science experts are up to the match. No need to stress and have sleepless nights. Our academic writers will tackle all your computer science assignments and deliver them on time. Let us handle all your python, java, ruby, JavaScript, php , C+ assignments!


While psychology may be an interesting subject, you may lack sufficient time to handle your assignments. Don’t despair; by using our academic writing service, you can be assured of perfect grades. Moreover, your grades will be consistent.


Engineering is quite a demanding subject. Students face a lot of pressure and barely have enough time to do what they love to do. Our academic writing service got you covered! Our engineering specialists follow the paper instructions and ensure timely delivery of the paper.


In the nursing course, you may have difficulties with literature reviews, annotated bibliographies, critical essays, and other assignments. Our nursing assignment writers will offer you professional nursing paper help at low prices.


Truth be told, sociology papers can be quite exhausting. Our academic writing service relieves you of fatigue, pressure, and stress. You can relax and have peace of mind as our academic writers handle your sociology assignment.


We take pride in having some of the best business writers in the industry. Our business writers have a lot of experience in the field. They are reliable, and you can be assured of a high-grade paper. They are able to handle business papers of any subject, length, deadline, and difficulty!


We boast of having some of the most experienced statistics experts in the industry. Our statistics experts have diverse skills, expertise, and knowledge to handle any kind of assignment. They have access to all kinds of software to get your assignment done.


Writing a law essay may prove to be an insurmountable obstacle, especially when you need to know the peculiarities of the legislative framework. Take advantage of our top-notch law specialists and get superb grades and 100% satisfaction.

What discipline/subjects do you deal in?

We have highlighted some of the most popular subjects we handle above. Those are just a tip of the iceberg. We deal in all academic disciplines since our writers are as diverse. They have been drawn from across all disciplines, and orders are assigned to those writers believed to be the best in the field. In a nutshell, there is no task we cannot handle; all you need to do is place your order with us. As long as your instructions are clear, just trust we shall deliver irrespective of the discipline.

Are your writers competent enough to handle my paper?

Our essay writers are graduates with bachelor's, masters, Ph.D., and doctorate degrees in various subjects. The minimum requirement to be an essay writer with our essay writing service is to have a college degree. All our academic writers have a minimum of two years of academic writing. We have a stringent recruitment process to ensure that we get only the most competent essay writers in the industry. We also ensure that the writers are handsomely compensated for their value. The majority of our writers are native English speakers. As such, the fluency of language and grammar is impeccable.

What if I don’t like the paper?

There is a very low likelihood that you won’t like the paper.

Reasons being:

  • When assigning your order, we match the paper’s discipline with the writer’s field/specialization. Since all our writers are graduates, we match the paper’s subject with the field the writer studied. For instance, if it’s a nursing paper, only a nursing graduate and writer will handle it. Furthermore, all our writers have academic writing experience and top-notch research skills.
  • We have a quality assurance that reviews the paper before it gets to you. As such, we ensure that you get a paper that meets the required standard and will most definitely make the grade.

In the event that you don’t like your paper:

  • The writer will revise the paper up to your pleasing. You have unlimited revisions. You simply need to highlight what specifically you don’t like about the paper, and the writer will make the amendments. The paper will be revised until you are satisfied. Revisions are free of charge
  • We will have a different writer write the paper from scratch.
  • Last resort, if the above does not work, we will refund your money.

Will the professor find out I didn’t write the paper myself?

Not at all. All papers are written from scratch. There is no way your tutor or instructor will realize that you did not write the paper yourself. In fact, we recommend using our assignment help services for consistent results.

What if the paper is plagiarized?

We check all papers for plagiarism before we submit them. We use powerful plagiarism checking software such as SafeAssign, LopesWrite, and Turnitin. We also upload the plagiarism report so that you can review it. We understand that plagiarism is academic suicide. We would not take the risk of submitting plagiarized work and jeopardize your academic journey. Furthermore, we do not sell or use prewritten papers, and each paper is written from scratch.

When will I get my paper?

You determine when you get the paper by setting the deadline when placing the order. All papers are delivered within the deadline. We are well aware that we operate in a time-sensitive industry. As such, we have laid out strategies to ensure that the client receives the paper on time and they never miss the deadline. We understand that papers that are submitted late have some points deducted. We do not want you to miss any points due to late submission. We work on beating deadlines by huge margins in order to ensure that you have ample time to review the paper before you submit it.

Will anyone find out that I used your services?

We have a privacy and confidentiality policy that guides our work. We NEVER share any customer information with third parties. Noone will ever know that you used our assignment help services. It’s only between you and us. We are bound by our policies to protect the customer’s identity and information. All your information, such as your names, phone number, email, order information, and so on, are protected. We have robust security systems that ensure that your data is protected. Hacking our systems is close to impossible, and it has never happened.

How our Assignment  Help Service Works

1.      Place an order

You fill all the paper instructions in the order form. Make sure you include all the helpful materials so that our academic writers can deliver the perfect paper. It will also help to eliminate unnecessary revisions.

2.      Pay for the order

Proceed to pay for the paper so that it can be assigned to one of our expert academic writers. The paper subject is matched with the writer’s area of specialization.

3.      Track the progress

You communicate with the writer and know about the progress of the paper. The client can ask the writer for drafts of the paper. The client can upload extra material and include additional instructions from the lecturer. Receive a paper.

4.      Download the paper

The paper is sent to your email and uploaded to your personal account. You also get a plagiarism report attached to your paper.

smile and order essaysmile and order essay PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A PERFECT SCORE!!!

order custom essay paper