サンプル
Default Sample
This is the respiratory system. The upper respiratory tract includes the nose, pharynx and larynx. This is where air enters and is filtered. The lower respiratory tract contains the trachea, bronchi and lungs, where oxygen exchange occurs and carbon dioxide is removed.
説明
いいね数
0
0
マーク数
0
0
共有数
0
0
使用回数
1
1