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Test: Excretion in Humans - Year 11 MCQ


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10 Questions MCQ Test Biology for GCSE/IGCSE - Test: Excretion in Humans

Test: Excretion in Humans for Year 11 2024 is part of Biology for GCSE/IGCSE preparation. The Test: Excretion in Humans questions and answers have been prepared according to the Year 11 exam syllabus.The Test: Excretion in Humans MCQs are made for Year 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Excretion in Humans below.
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Test: Excretion in Humans - Question 1

What is the primary role of the glomerulus in the nephron?

Detailed Solution for Test: Excretion in Humans - Question 1

The glomerulus filters blood under pressure, allowing small molecules like glucose, water, and urea to move into the Bowman's capsule and form filtrate.

Test: Excretion in Humans - Question 2

During selective reabsorption, which part of the nephron is primarily responsible for the active transport of glucose back into the bloodstream?

Detailed Solution for Test: Excretion in Humans - Question 2

The proximal convoluted tubule is where glucose is actively reabsorbed into the bloodstream. This segment contains transporters and mitochondria for active transport.

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Test: Excretion in Humans - Question 3

What happens to excess amino acids in the liver?

Detailed Solution for Test: Excretion in Humans - Question 3

Excess amino acids are deaminated in the liver, converting the amino group into ammonia, which is then converted into urea for safer excretion.

Test: Excretion in Humans - Question 4

Which organ primarily handles the excretion of carbon dioxide?

Detailed Solution for Test: Excretion in Humans - Question 4

Carbon dioxide is primarily excreted through the lungs, where it is removed from the blood and exhaled.

Test: Excretion in Humans - Question 5

What is the effect of high levels of urea in the blood if not properly excreted?

Detailed Solution for Test: Excretion in Humans - Question 5

High levels of urea can lead to cell death and deposits in blood vessels, as it becomes toxic if not excreted effectively.

Test: Excretion in Humans - Question 6

How does the reabsorption of salts in the Loop of Henle affect water reabsorption?

Detailed Solution for Test: Excretion in Humans - Question 6

The reabsorption of salts in the Loop of Henle triggers the movement of water by osmosis, leading to increased water reabsorption.

Test: Excretion in Humans - Question 7

Why is glucose not normally found in the urine of healthy individuals?

Detailed Solution for Test: Excretion in Humans - Question 7

In healthy individuals, glucose is reabsorbed completely in the proximal convoluted tubule, so it is not found in the urine.

Test: Excretion in Humans - Question 8

Which part of the nephron is responsible for the final adjustment of urine concentration?

Detailed Solution for Test: Excretion in Humans - Question 8

The collecting duct is responsible for the final adjustment of urine concentration, influenced by the body's hydration needs.

Test: Excretion in Humans - Question 9

How does the body respond to high blood carbon dioxide levels?

Detailed Solution for Test: Excretion in Humans - Question 9

High blood carbon dioxide levels trigger an increase in respiration rate to expel more carbon dioxide and restore normal pH levels.

Test: Excretion in Humans - Question 10

What is the main purpose of ultrafiltration in the nephron?

Detailed Solution for Test: Excretion in Humans - Question 10

The main purpose of ultrafiltration is to filter small molecules from the blood into the Bowman's capsule, forming the filtrate that will be processed further in the nephron.

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