Class 11 Biology - Chapter Breathing and Exchange of Gasses NCERT Solutions | Define oxygen dissociation curve. Can yo
Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
The oxygen dissociation curve is a graph showing the percentage saturation of oxyhaemoglobin at various partial pressures of oxygen.
The curve shows the equilibrium of oxyhaemoglobin and haemoglobin at various partial pressures.
In the lungs, the partial pressure of oxygen is high. Hence, haemoglobin binds to oxygen and forms oxyhaemoglobin.
Tissues have a low oxygen concentration. Therefore, at the tissues, oxyhaemoglobin releases oxygen to form haemoglobin.
The sigmoid shape of the dissociation curve is because of the co-operative binding of oxygen to haemoglobin. As the first oxygen molecule binds to haemoglobin, it increases the affinity for the second molecule of oxygen to bind. Subsequently, haemoglobin attracts more oxygen.Hence Haemoglobin is a positively co-operative protein.
More Questions From Class 11 Biology - Chapter Breathing and Exchange of Gasses
- Q:- What are the major transport mechanisms for CO2? Explain.
- Q:- What will be the pO2 and pCO2 in the atmospheric air compared to those in the alveolar air?
(i) pO2 lesser, pCO2 higher
(ii) pO2 higher, pCO2 lesser
(iii) pO2 higher, pCO2 higher
(iv) pO2 lesser, pCO2 lesser - Q:- Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?
- Q:- Define vital capacity. What is its significance?
- Q:- Explain the process of inspiration under normal conditions.
- Q:- How is respiration regulated?
- Q:-
Distinguish between
(a) IRV and ERV
(b) Inspiratory capacity and Expiratory capacity
(c) Vital capacity and Total lung capacity - Q:-
What is the effect of pCO2 on oxygen transport?
- Q:- State the volume of air remaining in the lungs after a normal breathing.
- Q:- What happens to the respiratory process in a man going up a hill?
Popular Questions of Class 11 Biology
- Q:- Why are living organisms classified?
- Q:- Discuss how classification systems have undergone several changes over a period of time?
- Q:- What is the basis of classification of algae?
- Q:- What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
- Q:- What is meant by modification of root? What type of modification of root is found in the (a) Banyan tree (b) Turnip (c) Mangrove trees
- Q:- State the location and function of different types of meristem.
- Q:- Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?
- Q:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell. - Q:- What are macromolecules? Give examples.
- Q:- What is the average cell cycle span for a mammalian cell?
Recently Viewed Questions of Class 11 Biology
- Q:- Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.
- Q:- Discuss the factors responsible for ascent of xylem sap in plants.
- Q:- Describe briefly the four major groups of Protozoa.
- Q:- Draw labelled diagrams of the following:
(a) Neuron
(b) Brain
(c) Eye
(d) Ear - Q:- Answer the following:
(a) Which part of the ear determines the pitch of a sound?
(b) Which part of the human brain is the most developed?
(c) Which part of our central neural system acts as a master clock? - Q:- What different criteria would you choose to classify people that you meet often?
- Q:- When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
- Q:- Write a note on economic importance of algae and gymnosperms.
- Q:- Even though a very few cells in a C4 plant carry out the biosynthetic Calvin pathway, yet they are highly productive. Can you discuss why?
- Q:- Define a cardiac cycle and the cardiac output.
8 Comment(s) on this Question
Really appreciable
Very useful,thanks
Thanks
Nice
Helpful
Give some short answer according to a11 class student because students are also child a little,cute and lovely child
Nice answer
Thnxxx fr ur crrct ans.
- All Chapters Of Class 11 Biology
- All Subjects Of Class 11