Answer:
· The principle of progression states that you should increase overload, which can be achieved by using FITT (frequency, intensity, time, and type) when your body adapts to its present routine. The specificity principle states that only targeted exercises will improve specific fitness goals.
 
        
             
        
        
        
The right chamber( right atrium)
        
                    
             
        
        
        
The heart itself needs blood and nutrients to work properly and gets its share of blood supply from coronary arteries. Coronary heart diseases are linked to coronary arteries. The diseases of coronary arteries are very dangerous; coronary artery diseases like atherosclerosis may cause heart attack.
        
             
        
        
        
Answer:
Use insect repellent, wear long-sleeved shirts and long pants, and control mosquitoes inside and outside your home. Each year, an estimated 400 million people are infected with dengue virus. About 100 million get sick.