In this course, the term source represent what most people refer to as the creator, the universe, the cosmos, God, divinity... 
It is also the great white expanse where everything originates: the great undifferentiated essence of our very existence.

How much blood in our bodies

Males of average height have about 4 grams of iron in their body, females about 3.5 grams; children will usually have 3 grams or less. These 3-4 grams are distributed throughout the body in hemoglobin, tissues, muscles, bone marrow, blood proteins, enzymes, ferritin, hemosiderin, and transport in plasma.

pineal gland activation

The Pineal gland activation was a central part of the Maya initiation process.
See links below for more info.