oxygen enters pharynx and larynx then the trachea then to left and right bronchi then to the bronchioles then to the capillaries then to alveoli then to blood that has oxygen which enters the digestive system
oxygen enters digestive system
nutrients absorbed by the villi go to the blood veins, the blood, then to the liver which goes to the circulatory system
nutrients enter circulatory system through capillaries then to the veins, heart, arteries, then back to blood then into the excretory system
blood, kidneys, nephrons, ureter then to urethra which eliminates as urine
