Download This Sample
This sample is exclusively for KidsKonnect members!
To download this worksheet, click the button below to signup for free (it only takes a minute) and you'll be brought right back to this page to start the download!
Sign Me Up
The excretory system is a collection of organs with the main function of excretion or the process of disposing waste from the body. Moreover, the excretory system is responsible for the elimination of waste produced by the chemical processes in the body to regulate its metabolism.
See the fact file below for more information on the excretory system or alternatively, you can download our 25-page Excretory System worksheet pack to utilise within the classroom or home environment.
Key Facts & Information
- It eliminates waste products in the body such as urea, uric acid ammonia, and other waste products.
- These products are excreted from the body through urine.
- The excretory system helps in maintaining the osmotic level of blood and plasma.
- It is involved in the process of osmoregulation, a process that maintains the proper amount of electrolytes in the body regardless of external factors like temperature, diet, and weather conditions.
- An electrolyte is a substance that produces an electrically conductive solution when dissolved in a polar solvent like water. It is maintained through osmoregulation and is involved in vital processes of the body.
- When taking medication, the excretory system metabolizes or processes the drugs that are not processed in the liver.
MAIN ORGANS AND THEIR FUNCTIONS
- The kidneys are the main organ of the excretory system.
- Each individual has a pair of kidneys, located on each side of the spine at the level of the liver.
- The kidneys are divided into three regions: the renal cortex, renal medulla, and renal pelvis.
- The renal cortex is the outer region of the kidney. It is the region between the renal capsule and the renal medulla. It is made up of blood vessels connected to the nephrons.
- Erythropotein, a hormone needed for the synthesis of new red blood cells, is also produced in the renal cortex.
- The renal medulla is the inner region of the kidney. It is where renal pyramids are found. These are dense networks of nephrons. This is where blood is filtered and water and ion levels are regulated.
- The renal pelvis is the region where blood enters and exits the kidney. It is also where urine exits from the ureters and empties into the urinary bladder. It is the region that connects the kidney to the rest of the body.
- Nephrons are found in the kidneys and are responsible for the filtration of blood and regulation of chemicals.
- The ureter is connected to the renal pelvis.
- It is a muscular tube whose sole function is to carry urine from the kidneys to the bladder.
- URINARY BLADDER
- The urinary bladder is a sac-like structure, lined with a smooth layer of muscle, where the ureter transports urine from the kidneys.
- It stores urine until it is expelled from the body via microturition, the act of expelling urine from the body.
- The placement of the urinary bladder differs in gender.
- Microturition has two main stages:
- Resting or Filling stage
- This is the phase where urine is transported from the kidney via the ureter.
- The ureter is obliquely placed in the bladder. Its opening to the bladder is not guarded by any muscle; this prevents the urine from re-entering the ureter and allows the bladder (the detrusor muscle) to relax and store more urine.
- Voiding stage
- Voiding is the stage where urine is expelled.
- In this stage, the bladder and urethra are involved.
- The detrusor muscle, which was relaxing at the resting or filling stage, contracts when the bladderʼs capacity is reached.
- The urethraʼs muscles, internal and external muscles, relax.
- The nervous system is also involved in the process.
- As the bladder reaches its capacity, the receptors on the walls of the bladder send an impulse through the pelvic nerve to the brain via the spinal cord.
- The urethra is a tube that arises from the urinary bladder and functions to expel urine to the outside by microturition.
- The urethra is the pathway for both urine and sperm for males.
- Men have longer urethras than women.
- The opening of the urethra is guarded by a sphincter that is autonomically controlled.
OTHER EXCRETORY ORGANS
- The skin is the largest organ in the body.
- The skin excretes body waste via sweating.
- The lungs are the main organ of the respiratory system.
- The lungs expel waste by taking in oxygen and breathing out carbon dioxide.
- The lungs also expel water in the form of vapor.
- The liver is also important in the excretion of waste in the body.
- It is the first to process hormones, fats, alcohol, and drugs.
- While few drugs are directly eliminated in the kidneys, drugs are first or partially processed in the liver.
Excretory System Worksheets
This is a fantastic bundle which includes everything you need to know about the excretory system across 25 in-depth pages. These are ready-to-use Excretory System worksheets that are perfect for teaching students about the excretory system which is a collection of organs with the main function of excretion or the process of disposing waste from the body. Moreover, the excretory system is responsible for the elimination of waste produced by the chemical processes in the body to regulate its metabolism.
Complete List Of Included Worksheets
- Excretory System Facts
- Incomplete Boxes
- Systems of the System
- Goodbye, Wastes!
- Urinary Labels
- Match The Organs
- The Excretion Process
- Excretory Crossword
- Different Concepts
- Excretory Diseases
- Better Than Cure
Link/cite this page
If you reference any of the content on this page on your own website, please use the code below to cite this page as the original source.
Link will appear as Excretory System Facts & Worksheets: https://kidskonnect.com - KidsKonnect, October 3, 2019
Use With Any Curriculum
These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.