The portion of the membrane that faces the lumen is called the apical membrane.
Membrane is the lipid bilayer that surrounds the cell on its outer surface. The membrane serves various functions like: protection, cell shape and integrity and regulate the traffic of molecules across the membrane. It is semi-permeable in nature.
Lumen is the hollow portion present inside any organ or tube like the artery or intestine. It is a Latin word that means 'an opening'. The lumen of different organs served various purposes. However, the major function is the transport of substances like air, nutrients, waste materials, immune cells, hormones, etc.
To know more about lumen, here
brainly.com/question/28116757
#SPJ4
Answer: Skeletal system Explanation:
Answer: they have to maintain homeostasis, so they remove waste to do so..
Answer:
false
Explanation:
The reason why its false is because a person can't fight diseases with acids. there is something your body has called Antibodies. Also acid would only make it worse