Class 11 Biology - ODISHA
Breathing and Exchange of Gases
The chapter 'Breathing and Exchange of Gases' in Class 11 Biology explores the mechanism of respiration and how organisms obtain oxygen and release carbon dioxide. Students will learn about the human respiratory system, respiratory volumes, and capacities, as well as the transport of respiratory gases like oxygen and carbon dioxide in the blood. Special emphasis is placed on the regulation of respiration and common respiratory disorders like asthma and emphysema. This chapter is vital for the Odisha BSE board exams, carrying a significant weightage with both direct descriptive questions and diagram-based problems that test conceptual understanding.
Start Learning FreeKey Concepts
Respiratory Organs
Different animals use different organs for breathing based on their habitats and organization, such as skin and lungs in amphibians, gills in fishes, and the tracheal system in insects.
Mechanism of Breathing in Humans
Inspiration and expiration involve pressure gradients created by the movement of the diaphragm and intercostal muscles, allowing air to flow in and out of the lungs.
Exchange of Gases
Gas exchange occurs across the respiratory membrane in the alveoli by simple diffusion, driven by partial pressure differences of oxygen and carbon dioxide.
Transport of Gases
Oxygen is primarily transported bound to hemoglobin as oxyhemoglobin, while carbon dioxide is transported as bicarbonate ions, dissolved in plasma, and carbaminohemoglobin.
Regulation of Respiration
The respiratory rhythm center in the medulla oblongata and the pneumotaxic center in the pons primarily regulate and control the rate of breathing.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 11 Biology examinations, this chapter typically carries around 5 to 7 marks. Common question types include long-answer questions explaining the mechanism of breathing or transport of gases, short-answer questions on respiratory volumes, and diagram-based questions labeling the human respiratory system.
Frequently Asked Questions
What is the difference between breathing and respiration?
Breathing is a physical process of inhaling oxygen and exhaling carbon dioxide, whereas respiration is a biochemical process where glucose is oxidized inside cells to release energy.
What is Residual Volume and why is it important?
Residual volume is the volume of air remaining in the lungs even after a forcible expiration. It prevents the lungs from collapsing and ensures continuous gas exchange.
How is carbon dioxide transported in the blood?
Carbon dioxide is transported mainly as bicarbonate ions (about 70%), carbaminohemoglobin bound to hemoglobin (20-25%), and in a dissolved state in plasma (7%).
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