Question

Write the following statements true or false.
1. Influenza is a disease of the respiratory system.
2. During the day the wind speed is from land to sea.
3. Urea is a nitrogen nutrient.
4. Inertia is a scalar quantity.​

Answer 1

Abstract

A new technique of cell culture in gas phase may be used for the "in vitro" study of the effects of toxic gases on the alveolar macrophages responsible for phagocytic defence of the respiratory system. Macrophage cells deposited on a porous membrane applied to the surface of a reservoir filled with nutrient fluid, survive in direct contact with the atmosphere, retaining normal metabolic and functional activities for several days. It is then possible to analyse the effects exerted on these cells by various types of gaseous aerocontaminants. This "in vitro" technique is highly sensitive. Nitrogen dioxide and ozone have cytotoxic effects after 30 minutes exposure at concentrations at less than 1 p.p.m. Acrolein has a harmful effect only at concentrations of 8 to 35 p.p.m. A mixture of oxygen (95 p. cent) and of CO2 (5 p. cent) causes much slower cell destruction, in a period varying from 2 to 6 days. Information provided by this method must be interpreted taking two concepts into account: 1--"in vitro" cytotoxicity explores only one aspect of the harmfulness of a gas, since the latter may have pathological effects by other mechanisms: irritant action on the respiratory mucosa resulting in hypersecretion and bronchospasm, ciliary paralysis or destruction, changes in the alveolar wall also capable of disturbing the phagocytic intervention of alveolar macrophages; 2--"in vitro", certain gaseous aerocontaminants are fixed or

Answer 2

Answer:

First ans is true

second ans is false

third ans is true

fourth ans is false

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