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Surfactant...

Surfactant

A

Is a protein produceb by type - II alveolar cells

B

Is exvessive in many premature infacts resulting in difficulties in breathing

C

Decrese the surface tension of the fluid lining the alveoli

D

Is lacking in individuals suffering from acute respiratory stress syndrome

Text Solution

Verified by Experts

The correct Answer is:
C
Lecithin lining the alveolar epithelium acts as surfactant and prevents collapsing of alveolar wall by decreasing the surface tension.
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Assertion (A): Micelles are formed by surfactant molecules above the critical micellization concentration (CMC) . Reason(R): The conductivity of a solution having surfactant molecules decreases sharply at the CMC .

Statements : The micelle formation by a surfactant takes places at certain concentration at definite temperature . Expabnations : The temperature above which a surfactant forms micells is called Kraft point .

10 ml of 1 millimolar surfactant solution forms a monolayer covering 0.24cm^(2) on a polar substrate. If the polar head is approximated as a cube. Consider the surfactant is adsorbed only on one face of the cube. What is the edge length of cube? (Answer should be in pm and assume Avogadro's number =6xx10^(23) ).

each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: Micelles are formed by surfactant molecules above the critical micelle concentartion (CMC). STATEMENT-2: The conductivity of a solution having surfactant molecules decrease sharply at the CMC.

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 (i) the point of bifurcation of trachea is called carina and is at the level of 5th thoracic vertiebra (ii)the right bronchus is shorter iwder and more in line with trachea than the let bronchus (iii) the bronchioles are without cartilaginous rings (iv) the surfactant of lungs is secrated in infants between 6th and 7th month o flife which of these are correct ?

MODERN PUBLICATION-BREATHING AND EXCHANGE OF GASES-COMPETITION FILE (MULTIPLE CHOICE QUESTIONS (MCQS)):
  1. Vital capacity is

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  2. If concentration of CO(2) is more the curve of oxygen will shift towar...

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  3. Surfactant

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  4. the volume of air which remains in the conducting airways and is not a...

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  5. The two organisms which breathe only through their moist skin are

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  6. The blood-brain barrier

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  7. When fats are respiratory substrate the value of R.Q would be

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  8. The amount of O(2) transported in a dissolved state through plasma is ...

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  9. In humans, which among these is not a step in respiration

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  10. the enzyme essential for the transport for the transport of CO(2) as d...

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  11. The inspiratory reserve volume + tidal volume + expiratory reserve vol...

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  12. Between breaths, the intrapleural pressure is approximately ……. Mm Hg ...

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  13. Approximately seventy percent of carbon dioxide absorbed by the blood ...

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  14. When you hold your breath, which of the following gas changes in blood...

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  15. The flight muscles in an eagle has more of aerobic muscles. These musc...

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  16. The volume of air that will remain in the lungs after a normal expirat...

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  17. The entry of food into the larynx is prevented by :

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  18. The partial pressure of oxygen in the alveoli of the lungs is

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  19. Lungs do not collapse between breaths and some air always remains in t...

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  20. Name the chronic respiratory disorder caused mainly by cigarette smoki...

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