Answer:
b. It keeps alveoli from collapsing with breaths.
Explanation:
Surfactants are highly surface active agents which are formed from a protein and lipid complex. It comprises of a hydrophobic and hydrophilic portion and its sole purpose is to control the tension at the air-liquid interface and thereby lower the surface tension. Surfactants are produced by the type II aveolar pneumocytes in the lungs.
Surfactants are needed in order to aid breathing and prevent straining oneself, it also prevents the lungs from collapsing during breathing, a term known as atelectasis.
 
        
             
        
        
        
Question's pretty vague, although I recommend a name that's brief and easily recognizable as well as something that relates to the purpose. So if someone sees it, they can easily remember and identify what it is exactly. 
        
             
        
        
        
Answer:
Androstenedione is a steroid hormone. It is used to make medicine. Androstenedione is used to increase the production of the hormone testosterone to enhance athletic performance, increase energy, keep red blood cells healthy, enhance recovery and growth from exercise, and increase sexual desire and performance.
Explanation:
 
        
             
        
        
        
<em>Hi !</em>
Natural remedies for rheumatoid arthritis 
<em>- relaxation</em>
<em>- Regular exercise</em>
<em>- Tai chi</em>
<em>- yoga</em>
<em>- Creams, gels, and lotions</em>
<em>- Plant oils</em>
<em>- Heat and cold</em>
<em>- homéopathie</em>
 
        
             
        
        
        
Answer:
UNable to complete daily tasks or responsibilities
Explanation: