Find the best tutors and institutes for Class 11 Tuition
Q12:
Have you heard about hypoxia? Try to gather information about it, and discuss with your friends.
Solution :
1. Definition and Physiological Basis of Hypoxia
Hypoxia is a pathological condition wherein the body or a region of the body is deprived of adequate oxygen supply at the tissue level. [Per the principles of cellular respiration, $O_2$ is the terminal electron acceptor in the electron transport chain; its deficiency halts ATP synthesis, leading to metabolic failure].
2. Classification of Hypoxia
Hypoxia is clinically categorized based on the mechanism of oxygen deficiency:
| Type | Mechanism | Primary Cause |
|---|---|---|
| Hypoxic Hypoxia | Low arterial $PO_2$ | High altitude, hypoventilation. |
| Anemic Hypoxia | Decreased $O_2$ carrying capacity | Anemia, Carbon Monoxide (CO) poisoning. |
| Stagnant (Circulatory) Hypoxia | Reduced blood flow | Heart failure, shock, local obstruction. |
| Histotoxic Hypoxia | Inability of cells to use $O_2$ | Cyanide poisoning (inhibits Cytochrome c oxidase). |
3. Visual Representation of Oxyhemoglobin Dissociation Curve Shifts
The following SVG illustrates the impact of environmental/metabolic stressors on hemoglobin oxygen saturation ($SaO_2$) relative to partial pressure ($PO_2$).
4. Clinical Manifestations and Physiological Responses
The body triggers homeostatic feedback loops to combat hypoxia:
- Ventilatory Response: Peripheral chemoreceptors (Carotid and Aortic bodies) detect low $PaO_2$ and stimulate the medulla oblongata to increase respiratory rate [Reflex arc of gas regulation].
- Erythropoiesis: Prolonged hypoxia leads to the release of Erythropoietin (EPO) from the kidneys, stimulating the bone marrow to produce more erythrocytes, increasing the oxygen-carrying capacity of blood.
- Symptoms: Cyanosis (bluish skin discoloration), tachycardia (increased heart rate), cognitive impairment, and in extreme cases, unconsciousness or tissue necrosis.
5. Case Study: High Altitude Hypoxia
At high altitudes, the barometric pressure decreases ($P_B \downarrow$), leading to a lower partial pressure of inspired oxygen ($PiO_2$). This results in a decreased pressure gradient for $O_2$ diffusion across the alveolar-capillary membrane [Fick’s Law of Diffusion: $Rate \propto \frac{\Delta P \cdot Area}{Thickness}$].
Final Solution: Hypoxia is defined as a pathological state where oxygen delivery is insufficient for cellular metabolic demand. It is classified into four physiological types based on the etiology of the oxygen deficit, with the body responding through compensatory mechanisms such as hyperventilation and increased red blood cell production to restore homeostatic $O_2$ partial pressures.
More Questions from Class 11 Biology Breathing and Exchange of Gases EXERCISES
- Q1: Define vital capacity. What is its significance?
- Q2: State the volume of air remaining in the lungs after a normal breathing.
- Q3: Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?
- Q4: What are the major transport mechanisms for $CO_2$? Explain.
- Q5: What will be the $pO_2$ and $pCO_2$ in the atmospheric air compared to those in the alveolar air ?
- Q6: Explain the process of inspiration under normal conditions.
- Q7: How is respiration regulated?
- Q8: What is the effect of $pCO_2$ on oxygen transport?
- Q9: What happens to the respiratory process in a man going up a hill?
- Q10: What is the site of gaseous exchange in an insect?
- Q11: Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
- Q13(a): Distinguish between (a) IRV and ERV
- Q13(b): Distinguish between (b) Inspiratory capacity and Expiratory capacity.
- Q13(c): Distinguish between (c) Vital capacity and Total lung capacity.
- Q14: What is Tidal volume? Find out the Tidal volume (approximate value) for a healthy human in an hour.
CBSE Solutions for Class 11 Biology Breathing and Exchange of Gases
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
Top Tutors who teach Breathing and Exchange of Gases
Top Tutor
Rahara Kalyan Nagar, Kolkata
16 yrs of
Exp
1 student
270 hrs of classes completed
600
per hour
Online Classes
Student's Home
Tutor's home
Starting always matters, and I think class 10 or class 11 is a starting point for a bright future. A subject like Mathematics can either become a nightmare or the first love of your life. So, I think I can help you to learn how to love the subject. If someone is really interested to learn the subject deeply not just to know problem solving tricks feel free to contact me.
Top Tutor
Kamarajar St Kattankulathur, Chengalpattu
10 yrs of
Exp
3 students
250 hrs of classes completed
750
per hour
Online Classes
Tutor's home
Willing to teach school children with special attention
Mam is tutoring both physics and chemistry to my daughter. She is very kind and patient. She clears her doubt then and there and she has an in-depth knowledge in both the subjects.
Top Tutor
Vijay Nagar Colony Sector 9, Ghaziabad
7 yrs of
Exp
18 students
1067 hrs of classes completed
400
per hour
Online Classes
Student's Home
Tutor's home
Founder of knowledge park classes. I am a graduate in corporate affairs and administration and CS Final too. I have experience of more than 10 years. Our results have been extra ordinary and one of our student from DPS greater Noida scored 100 marks in accounts in 2021-22 session. Over all all our students have been scoring 95 plus consistently from many years. I have successfully taught students of Amity, DPS, Ryan, gurukul among many others. I teach: Company account Financial management Business studies Mathematics Economics Taxation And all other subjects of Bcom,mcom,CA/CS/CMA.
Mandeep sir is a great teacher, He makes learning a tough subject like accountancy easy to learn. I have benefited a lot from his teaching.
Top Tutor
Naskar Bagan, Kolkata
2 yrs of
Exp
5 students
210 hrs of classes completed
400
per hour
Online Classes
Student's Home
Tutor's home
🚀 High-Impact Computer Science & IP Tutoring for CBSE& CISCE Class 10, 11 & 12 Hi! I’m a B.C.A. graduate and experienced online educator dedicated to helping students build genuine logical thinking and ace their board examinations. Having scored 94/100 in my own Class 12 Computer Science boards using highly efficient study strategies, I know exactly how to simplify the syllabus for maximum understanding and top marks. I bridge the gap between memorizing syntax and actually understanding how to code. 🌟 Why Choose My Classes? 1. Targeted Expertise: Specialized coaching for CBSE & CISCE Class 10 ,11 & 12 Computer Science, Informatics Practices (IP), and Information Technology (including Java, Python programming and database management). 2. Proven Resources: Standard reference alignment, custom study notes, topic-wise assignments, and rigorous mock tests. 3. Interactive Learning: 100% online sessions utilizing dynamic PPTs and live whiteboards—no boring lectures, just hands-on, practical coding. 4. Track Record: Successfully coached students from top schools to become confident, independent problem solvers. 5. My Approach: I don't just teach you how to write code; I teach you how to think like a programmer so you can approach any exam question with confidence. Let’s turn coding anxiety into board exam success.
He is the best teacher. He explains in easy language and develops a good bond with the student.
Top Tutor
Narasapur, Gadag
10 yrs of
Exp
1 student
70 hrs of classes completed
400
per hour
Online Classes
I specialize in breaking down complex mathematical derivations, interpreting complex velocity-time or field graphs, and explaining the physical significance behind equations.Step-by-step algorithmic breakdown of complex integrals, visualizing 3D space geometries, and teaching the underlying logic of proofs.I break down intimidating, high-weightage topics into digestible sub-concepts. For example, before diving into complex Electromagnetic Induction problems, I ensure the student thoroughly grips Lenz's Law and magnetic flux concepts.
Other Subjects in CBSE - Class 11
Download free CBSE - Class 11 Biology Breathing and Exchange of Gases EXERCISES worksheets
Download Now
