The container, or housing, also has {HEAD ~ a membrane} at an opening thereof which is permeable to {TAIL ~ oxygen} 
The container , or housing , also has { HEAD ~ a membrane } at an opening thereof which is permeable to { TAIL ~ oxygen }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL