The Office Christmas specials were released on VHS and DVD in the UK on 25 October 2004 by BBC Video. Extra features include an audio commentary on Part 2 by Merchant and Gervais, a retrospective documentary entitled "The Office: Closed For Business", the full video for Brent's version of "If You Don't Know Me By Now", a featurette about the cast and crew collecting the Golden Globes, and a studio version of "Freelove Freeway"—Brent's song from Series 1, Episode 4. It was released in the United States on 16 November 2004 with the same special features. The Office Christmas specials "The Office" Christmas Specials
All-or-none law contraction is not increased if the stimulus strength is further raised. Stronger stimuli bring more muscle fibres into action and thus the tension of a muscle increases as the strength of the stimulus applied to it rises. All-or-none law The all-or-none law is the principle that the strength by which a nerve or muscle fibre responds to a stimulus is independent of the strength of the stimulus. If that stimulus exceeds the threshold potential, the nerve or muscle fibre will give a complete response; otherwise, there is no response. It was first established by the American physiologist Henry Pickering Bowditch