1. I would say D.
2. I would say C.
Your mouth, nose, throat, sinuses and lungs are lined with mucus membranes. These membranes contain mucus glands that produce - surprise - mucus. Mucus-producing membranes line specific passages in your body, like the respiratory and digestive tracts, for protection and support.
An advantage of the syringe method is that blood appears in the hub when the vein has been entered.
