Answer to Question 1
The human body has three types of muscles, the skeletal muscles, the heart or cardiac muscles, and the smooth muscles. The skeletal muscles, the muscles of the body attached to bone, are also known as the striated muscles because of their shape and color and as the voluntary muscles since we have control over their contractions except during reflex actions. These muscles contrast with the heart muscles, which are responsible for the heart's contractions, and the smooth muscles such as those found in the gastrointestinal tract that are responsible for gastric motility and in the walls of the arteries.
Answer to Question 2
It's noteworthy that the more LDL particles circulating in the blood stream, the greater the likelihood some will penetrate the endothelial lining. That's why it is important to keep LDL levels within normal limits. As Granato explains, these particles tend to congregate on the endothelium like condensation on a shower door.
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