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Excretion in Animals Video Lecture | Biology for JAMB

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FAQs on Excretion in Animals Video Lecture - Biology for JAMB

1. What is excretion in animals?
Ans. Excretion in animals refers to the process by which waste products, such as carbon dioxide, ammonia, and excess water, are removed from an organism's body. This process helps to maintain the balance of various metabolic activities and ensures the proper functioning of an animal's internal systems.
2. How do animals excrete waste products?
Ans. Animals excrete waste products through various excretory organs and systems. For example, mammals excrete waste through the urinary system, which includes the kidneys, ureters, bladder, and urethra. Fish excrete waste through their gills and kidneys, while birds and reptiles excrete waste through their cloaca. Each animal species has specialized excretory organs that are adapted to their unique physiological needs.
3. What are the main excretory organs in animals?
Ans. The main excretory organs in animals vary depending on the species. In mammals, the kidneys are the primary excretory organs responsible for filtering waste products from the blood and producing urine. In birds and reptiles, the kidneys also play a crucial role in excretion. Fish have specialized excretory organs called nephrons located in their gills and kidneys. Additionally, animals may excrete waste through other organs such as the lungs, skin, or digestive system.
4. Why is excretion important for animals?
Ans. Excretion is vital for animals as it helps to maintain the internal balance of their bodies, known as homeostasis. By removing waste products, animals can regulate their blood pH, osmotic balance, and overall metabolic processes. Failure to excrete waste properly can lead to the accumulation of toxic substances in the body, resulting in various health issues and potentially fatal consequences.
5. How does excretion differ between different animal species?
Ans. Excretion differs between different animal species based on their physiological adaptations and habitats. For example, terrestrial animals such as mammals and reptiles have developed efficient urinary systems to conserve water and excrete concentrated urine. In contrast, aquatic animals like fish excrete waste mainly through their gills, where they remove ammonia directly from their bloodstream. Birds have evolved a unique excretory system that allows them to excrete uric acid, which is less toxic and requires less water for disposal compared to other waste products.
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