The Description of the Human Body He believed the heat of the heart somehow caused all movement of the body. Blood vessels he realized were pipes, he saw that veins carried digested food to the heart. (This was brought further by William Harvey. Harvey developed the idea of the circulation of the blood.) Descartes felt that an energetic part of blood went to the brain and there gave the brain a special type of air imbued with vital force that enabled the brain to experience, think and imagine. This special air then went through the nerves to the muscles enabling them to move. The Description of
The One I Gave My Heart To in which she showcased her belting range as she usually used her falsetto and lower register in most of her compositions. Warren spoke highly of Aaliyah's vocal performance, stating that "She could go where the Whitneys went. She wailed on that single I wrote for her. I write songs that challenge singers, and she rose to the occasion." The music video for "The One I Gave My Heart To" was directed by Darren Grant, and uses the single version of the song, keeping the second half of the first verse which is normally cut for radio airplay. Throughout the video