The respiratory system has two main jobs:
1. Diffusion occurs at the site of the alveoli and at the site of the muscle tissue? Why does diffusion occur?
Question 1 of 5
The alveoli are tiny air sacs found in the lungs. What are the alveoli surrounded by?
Question 2 of 5
What is the orange arrow pointing to?
Question 3 of 5
What is being shown by the blue arrow?
Question 4 of 5
Which muscles help with the mechanics of breathing during exercise?
Question 5 of 5