Question

Trace the path of an oxygen molecule.
Match the structure to the number for when the oxygen would first contact the structure when inhaled.
1.
2.
3.
4.
5.
6.
7.
8.
blood vessels
bronchi
trachea
larynx
alveoli
pharynx
mouth/nose
heart

Answer 1

Answer:

heart mouth and noes and blood vessels