Respiration in Organisms Class 7 Science (Biology) in One Shot | BYJU'S - Class 7

BYJU'S - Class 6, 7 & 8・2 minutes read

Ankita emphasizes the importance of understanding cellular respiration and the human respiratory system, encouraging interaction and note-taking for a strong foundation in learning and exam preparation. The exchange of gases in the alveoli is essential for respiration, with various organisms like cockroaches, earthworms, fishes, and frogs demonstrating different respiratory mechanisms for survival.

Insights

  • Ankita stresses the significance of understanding cellular respiration as the breakdown of food in cells to release energy, highlighting the essential role of glucose and oxygen in this process, emphasizing the critical importance of this foundational knowledge for future learning and exam preparation.
  • The text elucidates the diverse respiratory systems of various organisms, from humans to cockroaches, earthworms, fishes, and frogs, showcasing the unique adaptations each species has evolved for efficient gas exchange, with frogs, for instance, utilizing both lungs and moist skin for respiration, enabling them to respire effectively both underwater and on land, underscoring the remarkable diversity and complexity of respiratory mechanisms across the animal kingdom.

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Recent questions

  • What is cellular respiration?

    Cellular respiration is the process where cells break down food to release energy, involving glucose and oxygen.

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Summary

00:00

Ankita's Lesson: Cellular Respiration and More

  • The speaker joined Akasha in 9th standard, giving Anthony an 8th standard, marking a pivotal moment leading to competing across India.
  • The speaker, Ankita, greets students on Channel 6 7th and 8th, engaging with names like Kushi, Sarvesh, Rakesh, and others.
  • Ankita emphasizes the importance of finishing the chapter on respiration and organisms in one class, encouraging interaction and focus on learning.
  • Ankita discusses cellular respiration, defining it as the breakdown of food in cells to release energy, highlighting the importance of glucose and oxygen.
  • Cellular respiration occurs in all living organism cells, with glucose entering cells to undergo a chain reaction releasing energy, carbon dioxide, and water.
  • Two types of respiration are explained: aerobic, occurring in the presence of oxygen, and anaerobic, occurring without oxygen, producing alcohol, carbon dioxide, and energy.
  • The human respiratory system is detailed, starting from nostrils to pharynx, trachea, bronchi, bronchioles, and alveoli, with a focus on the exchange of gases in alveoli.
  • The pathway of exhalation is described, with carbon dioxide in the blood moving to the alveoli for gas exchange with oxygen, facilitated by capillaries surrounding the alveoli.
  • The structure of alveoli, resembling a bunch of grapes with blood vessels or capillaries around them, allows for the exchange of gases like oxygen and carbon dioxide.
  • Ankita encourages note-taking, interaction, and understanding of the respiratory system, emphasizing the importance of a strong foundation for future learning and examination preparation.

18:45

"Respiratory System: Gas Exchange and Breathing"

  • Exchange of gases occurs in the alveoli in the respiratory system.
  • The nasal passage leads to the pharynx, a common passage for air movement.
  • Arteries are large blood vessels carrying oxygen-rich blood, while capillaries are thin structures reaching tissues and cells.
  • The difference between the pharynx and the nasal passage lies in their paths.
  • Respiration and breathing are distinct processes, with breathing involving inhaling and exhaling air.
  • Inhaling involves the rib cage moving up and the diaphragm moving down to expand the chest cavity.
  • Exhaling sees the ribs moving down and the diaphragm moving up to decrease chest cavity space.
  • Cockroaches respire through spiracles, allowing air to enter the trachea and diffuse into body tissues.
  • Earthworms breathe through their moist skin, with air dissolving into the skin and diffusing into the body.
  • Fishes breathe through gills, extracting oxygen dissolved in water, while frogs, as amphibians, have lungs for breathing on land and in water.

39:22

"Breathing and Communication in Nature"

  • Frogs respire through both their lungs and their moist skin, allowing for gas exchange underwater and on land.
  • Fish communicate through various methods like noise, bubbles, and color changes, forming their own language.
  • Plants respire by taking in oxygen through stomata on their leaves and releasing carbon dioxide, with stomata aiding in gas exchange and photosynthesis.
  • Roots in plants also facilitate gaseous exchange, with guard cells controlling the opening and closing of stomata.
  • Plants perform photosynthesis during the day, taking in carbon dioxide and releasing oxygen, while respiration occurs at night, leading to higher carbon dioxide levels, making it advisable not to stay under a big tree at night due to increased carbon dioxide levels.
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