When we breathe in – When we breathe in – Inspiration – the following Expiration – the following happens… happens… Our diaphragm pulls Our diaphragm relaxes down Our intercostal Our intercostal muscles relax muscles contract Our chest becomes Air pressure is smaller reduced Pressure increases on Air is sucked through the lungs the tubes into lungs Air is forced out Our chest expands
When we breathe in – Inspiration – the following happens… When we breathe in – Expiration – the following happens… Our diaphragm pulls down Our intercostal muscles contract Air pressure is reduced Air is sucked through the tubes into lungs Our chest expands Our diaphragm relaxes Our intercostal muscles relax Our chest becomes smaller Pressure increases on the lungs Air is forced out
gcse_revision_booklet.docx