Respiratory tract:nasal cavity,pharynx,
Lungs:are formed by bronchi,
extensive network of capillaries.
Lungs-2 --Lungs are enveloped by the
pleura,composed by two membranes.
Between both membranes there is a
Gas exchange: After travelling
through the respiratory tract,air filled
with oxygen reaches the pulmonary
alveoli,where gas exchange occurs.
Pulmonary ventilation: it is the process
that renew air constantly for gas
exchange to function effectively.The
intercostal muscles and the
diaphragm are responsible for this
Digestion is the process by which
foods are transformed into simpler
substances(nutrients),so they can be
utilised by our cells.