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Questions and Answers
Which organs are primarily involved in excretion in vertebrates?
What is the main difference between excretion and secretion?
In mammals, how is urine expelled from the body?
What are the waste products produced during cellular respiration in the body?
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What is the harmful consequence of the accumulation of metabolic waste beyond a certain level in the body?
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Study Notes
Organs Involved in Excretion
- Kidneys are the primary organs responsible for filtering blood and producing urine in vertebrates.
- Liver plays a vital role in metabolizing substances and detoxifying harmful compounds before they are excreted.
- Skin and lungs also participate in excretion; skin eliminates waste through sweat, while lungs expel carbon dioxide during respiration.
Excretion vs. Secretion
- Excretion refers to the removal of waste products from the body, essential for maintaining homeostasis.
- Secretion involves the release of substances (like enzymes or hormones) produced by an organism, which serve specific functions in physiological processes.
Urine Expulsion in Mammals
- Urine is expelled from the body through the urethra, a tube connecting the bladder to the external environment.
- The bladder stores urine until voluntary signals trigger its release, controlled by sphincter muscles.
Waste Products of Cellular Respiration
- Carbon dioxide is generated as a byproduct when glucose is oxidized for energy.
- Water is also produced during cellular respiration, following the reduction of oxygen.
- Urea is formed from the breakdown of proteins and amino acids and is excreted as part of urine.
Consequence of Metabolic Waste Accumulation
- Accumulation of metabolic waste can lead to toxicity, impairing organ function and possibly resulting in severe health issues like kidney failure or systemic poisoning.
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Description
Test your knowledge of excretion and the organs involved in this important process with this quiz. Questions cover the role of lungs, kidneys, and skin in excretion, as well as the distinction between excretion and secretion.
