How can surveying reading material improve your comprehension?

Surveying is one of the reading techniques which one can use in order to quickly determine the content of a written document.
Surveying involves taking a broad look at a text by focusing on the general aspects in order to determine the relevancy and the value of the text, that is, to know whether it is worth reading or not.
Surveying helps comprehensions by bring to focus the general aspect of the text such as title and introduction. Understanding the general aspects of the text will greatly enhance one's understanding when one is reading for details.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.