Heart Motu Cordis" (1628) by the English physician William Harvey. Harvey's book completely describes the systemic circulation and the mechanical force of the heart, leading to an overhaul of the Galenic doctrines. Otto Frank (1865–1944) was a German physiologist; among his many published works are detailed studies of this important heart relationship. Ernest Starling (1866–1927) was an important English physiologist who also studied the heart. Although they worked largely independently, their combined efforts and similar conclusions have been recognized in the name "Frank–Starling mechanism". Although Purkinje fibers and the bundle of His were discovered as early as the 19th century, their
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