Answer:
If you still need the answer here it is! good luck
 
        
             
        
        
        
Answer:
<em>Hey there!</em>
3) Well injection is usually done through the vein because they need the substance to go into the blood. 
4) Some people believe that the heart is on the left side because its the left ventricle and atrium responsible and when people hear left they think the heart is on the left.
5) People living in high altitudes don't get as much oxygen so their bodies evolved into carrying ,more RBC so more oxygen is carried into their bodies.
<em>Hope this helps :)</em>
 
        
             
        
        
        
Answer:
Explanation:
Skeletal muscles are arranged in regular parallel bundles, cardiac muscle connect at branching irregular angles called intercalated disc,smooth muscle substains longer or even near permanent contractions
Cardiac muscle is located in the wall of the heart,appear striated and are under involuntary control.
Skeletal muscles fibres occurs in muscles which are attached to the skeleton...
I believe you've achieved some things from the explanation above... thanks
 
        
             
        
        
        
Lack of exercise 
High blood pressure 
Diabetes 
Obesity and high cholesterol 
        
             
        
        
        
Respiratory system, excretory system, digestive system