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  1. >>Class 11
  2. >>Biology
  3. >>Excretory Products and their Elimination
Common Misconceptions
6 min read

Excretory Products And Their Elimination

- Clear the fog of misconceptions and get a clarity of concepts.
1
Urine and Urea
Do you get confused with urine and urea? Well, do not worry. Many of us have this misconception that they are the same as they sound similar and both are related to excretion. But they are not the same, urea is a chief nitrogenous waste produced in mammals and some fishes. Urine is the liquid waste produced by the kidneys. Urea is eliminated through urine in mammals.
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How are urine and urea different from each other?
2
Urethra and Ureter
We often get confused between the urethra and ureters. Ureters are tube or duct that passes urine from each kidney to the urinary bladder and the urethra is the tubular path that eliminates the urine from the urinary bladder to the outside of the body.
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Differentiate between ureter and urethra.
3
Excretion and Egestion
Are excretion and egestion the same? We often think these are the same as both the process are involved in eliminating wastes but they are different. Let us find how they are different through the given gif.
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Mention the differences between egestion and excretion. 
4
Pain in Kidney Diseases
There is a misconception that diseases related to the kidney, is usually accompanied by pain in the sides and/or back. Kidney disease shows no symptoms until very advanced. And pain is NOT one of the common symptoms of kidney diseases. The kidneys only cause pain if there is an obstruction of urine flow out of the kidney, such as in passing a kidney stone, or in cases of significant kidney infection. Here are some of the symptoms when kidney disease becomes severe.
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A man went to the hospital to get a regular check-up. In a urine test, the doctors found that there his kidney was not working properly and recommended dialysis. The man was shocked when he heard this and said that he never felt any pain. This person's kidneys failed. Comment on this statement why he did not feel any pain.
5
Frequent Urination is a Healthy Sign?
A common misconception most people have that if we urinate frequently this means that our kidneys are doing their jobs and are perfectly healthy. But wait! it is not so, this can be a dangerous situation. Frequent urination can be a symptom of diseases related to the excretory system, diabetes or prostate gland problems.
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Frequent urination can be a symptom of:
A
Urinary tract infection
B
Heart disease
C
Diabetes mellitus
D
Both A and C
6
Is Excess Water Good for Kidneys?
Water is important for the normal functioning of the body. One of the major function of water is to keep our kidneys healthy by helping them to eliminate waste in the form of urine. So, we should keep ourselves well hydrated by drinking water. But we all know that anything in excess is harmful, this is true even in the case of water. Excess intake of water can be unhealthy. When our body takes in or holds on to more fluid than our kidneys can remove then over-hydration can occur. This increases the water levels to build up in our body causing major problems.
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In a function, a man started nauseating and he fainted suddenly. The entire day he drank 2 Litres of water every hour. What could be the reason behind this?
A
Weakness
B
Dehydration
C
Overhydration
D
Need to be tested