GPC negotiator Dr Peter Holden told the coroner's inquest into the London bombings how the committee was preparing for its usual Thursday meeting at the time.
Dr Michelle Drage told the inquiry how one of her colleagues 'jumped into her arms' when the bomb went off, as a 'huge vibration' shook the room.
After the explosion, in case of a secondary device, the group waited a few minutes before heading down to the courtyard of BMA House.
They then pitched in to help as victims of the bombings, in some cases severely or fatally injured, were brought through to the courtyard.
Dr Drage described how BMA staff and doctors were organised into a 'field hospital type of arrangement' as victims were carried through on makeshift stretchers, made from tables or other items.
Dr Holden, who has trained to handle major medical emergencies, set about organising care on the scene and prioritising patients.
He told the inquiry how admirably his BMA colleagues responded to the circumstances: 'It was one of the abiding memories I have of the day, to watch a colleague and friend of mine who, in his own words, has said to me many times since, "I haven't done anything like this for 20 years", he stuck a drip in as though he'd done it yesterday.'