Which of the following substances are not present in the initial filtrate of nephron?a)Plateletsb)Ureac)Glucosed)Amino acidCorrect answer is option 'A'. Can you explain this answer?

Question

Accepted Answer

Filtering unit of kidney is nephron. Platelets are present in the muscle part only and not in the initial filtrate .

Answer

Plateletes

Answer

Option [a] becoz--->

The resulting filtrate(of nephron) contains waste, but also other substances the body needs essential ions, glucose, amino acids, and smaller proteins.

Answer

Yes large particle not absorbed by bundle of capillaries means gloumerlus.

Answer

A) Platelets

Answer

Filtering unit of kidney is nephron platelets are present in muscle part only they will cloed the blood

Answer

Introduction:
The filtration process in the nephron of the kidney is responsible for removing waste products and excess substances from the blood. This process occurs in the glomerulus and forms the initial filtrate, which then undergoes reabsorption and secretion to form urine. In this question, we are asked to identify the substance(s) that are not present in the initial filtrate of the nephron.

Analysis:
To determine which substances are present in the initial filtrate of the nephron, we need to understand the process of filtration in the glomerulus. The glomerulus is a network of capillaries with small pores that allow the passage of small molecules from the blood into the filtrate. However, larger molecules, such as proteins and blood cells, are not able to pass through these pores and are therefore not present in the initial filtrate.

Explanation:
Let's analyze each of the given substances to determine their presence in the initial filtrate of the nephron:

a) Platelets:
Platelets are small cell fragments that are responsible for blood clotting. They are not present in the initial filtrate because they are much larger than the size of the pores in the glomerulus. Therefore, option A is correct.

b) Urea:
Urea is a waste product formed during the breakdown of proteins in the liver. It is small enough to pass through the pores in the glomerulus and is present in the initial filtrate. Therefore, option B is incorrect.

c) Glucose:
Glucose is a small molecule that is an important source of energy for the body. It is normally reabsorbed by the renal tubules and does not appear in the urine. However, in certain conditions such as uncontrolled diabetes, glucose levels may exceed the reabsorption capacity of the renal tubules, resulting in the presence of glucose in the urine. In the initial filtrate, glucose is present and is later reabsorbed. Therefore, option C is incorrect.

d) Amino acids:
Amino acids are the building blocks of proteins and are necessary for various physiological processes. They are small enough to pass through the pores in the glomerulus and are present in the initial filtrate. Therefore, option D is incorrect.

Conclusion:
Based on the analysis, the substance that is not present in the initial filtrate of the nephron is platelets (option A). This is because platelets are larger in size and cannot pass through the pores in the glomerulus. The other substances mentioned, including urea, glucose, and amino acids, are present in the initial filtrate and undergo further reabsorption and secretion processes in the nephron.

Answer

Size of platelet is larger than other substance given and are not toxic to be excreated out.

Answer

Platelets<div><br /></div>

Answer

Is option A is correct answer

Similar Class 10 Doubts

What substances are selectively re-absorbed from the initial filtrate in the kidneys?

What substances are selectively re-absorbed from the initial filtrate in the kidneys?

Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Excretion in Animals and Plants (Life Processes)" are available for CBSE Class 10 Science and have been compiled as per the syllabus of CBSE Class 10ScienceQ. Excretion is

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