Angus Robertson, the SNP's Westminster leader, asks David Cameron about the strikes planned by junior doctors in England following a clash with the government over pay and conditions.
Mr Robertson asked why junior doctors in Scotland, which runs its own health service, were not striking.
The PM said the UK government was increasing spending on the NHS and said he was determined to secure a seven-day service.
The British Medical Association has called three-walkouts - the first next Tuesday - after talks broke down.