Home
Class 12
BIOLOGY
Read the following statement carefully. ...

Read the following statement carefully.
A. The diffusion membrane is made up of three major cellular layers.
B . The partial pressure of oxygen and carbon dioxide gases in mmHg are the same for both deoxygenated blood and tissue.
Select correct option about the above statements .

A

Statement A is correct but B is incorrect.

B

Statement B is correct but A is incorrect.

C

Both A and B are correct.

D

Both A and B are incorrect

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, we will evaluate each one step by step. **Step 1: Evaluate Statement A** - The statement claims that "The diffusion membrane is made up of three major cellular layers." - In the context of gas exchange in the lungs, the diffusion membrane refers to the pulmonary capillary membrane, which is indeed composed of three layers: 1. The thin squamous epithelium of the alveoli (the air sacs in the lungs). 2. The basement membrane that lies between the alveolar epithelium and the capillary endothelium. 3. The endothelium of the capillaries, which is also made up of squamous epithelial cells. - Since all three layers are essential for the diffusion of gases (oxygen and carbon dioxide), this statement is **correct**. **Step 2: Evaluate Statement B** - The statement claims that "The partial pressure of oxygen and carbon dioxide gases in mmHg are the same for both deoxygenated blood and tissue." - In the case of deoxygenated blood, the partial pressure of oxygen (pO2) is approximately 40 mmHg, and the partial pressure of carbon dioxide (pCO2) is about 45 mmHg. - These values reflect the equilibrium between the deoxygenated blood and the surrounding tissues, where the pO2 and pCO2 are similar in both compartments. - Therefore, this statement is also **correct**. **Conclusion:** Both statements A and B are correct. Thus, the correct option regarding the statements is option 3. ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements about respiratory system of humans : I. Type II alveoli help in secretion of a chemical surfactant called lecithin , which decreases the surface tension around alveoli. II. The diffusion membrane for exchange of gases is made up of three major cellular layers. III. Binding of oxygen with hemoglobin is primarily related to the partial pressure of O_2 . IV. Every 100 ml of oxygenated blood can deliver around 5 ml CO_2 to the tissues under normal physiological conditions. How many statement is /are correct from the above ?

Read the following statements carefully Y : The resistivity of semiconductor decreases with increases of temperature. Z : In a conducing solid, the rate of collisions between free electrons and ions increases with the increase of temperature. Select the correct statement ( s ) from the following a. Y is true but Z is false b. Y is false but Z is true c.Both Y and Z are true d. Y is true Z and Z is the correct reason for Y

Read the following statements carefully (i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart. (ii) The openings of the right and the left ventricle into pulmonary artery and aorta respectively are provided with the mitral valves. (iii) The nodal musculature has the ability to generate action potential without any external stimuli, i,e., it is autoexcitable. (iv) The T-wave of ECG represents depolarisation of the ventricles. Which of the above four statements are incorrect?

Refer to the given diagrammatic representation of the transportation of oxygen and carbon dioxide in the blood. P, Q, R, S and T represent percentage of both gases in different forms. Select the correct option for P-T .

Read the following statement . a) High H^+ concentration and higher temperature are favourable for dissociation of oxygen from oxyhaemoglobin. b) Partial pressure of oxygen in alveoli is higher than in tissue . c) The maximum volume of air a person can breather in after a forced expiration is vital capacity. d) In alveoli PCO_2 low and PO_2 high are for dissociation of CO_2 from carbamino haemoglobin . How many of the above statement are true ?

Following is a tabular respresentation of partial pressure (in mmHg ) of oxygen and carbon dioxide at different parts involved in diffusion in cmparison to those in atmosphere : Choose from the option which correctly fills up the values A,B,C,D and E

Which one of the following statements is correct about the human circulatory system? (A) Blood transports only oxygen and not carbon dioxide. (B) Human heart has five chambers. (C) Valves ensure that the blood does not flow backwards. (D) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.

Read the following four statement carefully. (i) Ventral respiratory group of neurons of medulla oblongata can cause both inspiration and expiration. (ii) The part of the respiratory system starting with the external nostrils up to the terminal bronchioles constitutes the respiratory or exchange part of the respiratory system. (iii) During swallowing epiglottis can be covered by a thin elastic cartilaginous flap called glottis to prevent the entry of food into the larynx. (iv) Binding of oxygen with haemoglobin in primarily related of oxygen with haemoglobin is primarily related to partial prssure of O_(2) . Which of the above two statement are correct ?