Respuesta :
The structure labeled in the diagram is a membrane protein.
The cell is called the smallest, structural and functional unit of life because it is one to form the bodies and their complex organization and also involves all the cell organelles like the nucleus, mitochondria, ribosomes, lysosomes, vesicles, vacuole, Golgi bodies to perform different functions like respiration, transportation, excretion and so on and the main important part of the cell is the cell wall to protect it which has different layers like plasma membrane and plasma membrane has some proteins called as membrane proteins or the proteins present in the membrane and they are mainly of two types which are intrinsic proteins and extrinsic or peripheral proteins and they are necessary for the facilitated diffusion and are also called as the transport channels because they can work in both down the gradient and against the grdeint but it doesnt involve th usage of ATP and is called as passive transport an they cam transport from extracellular membrane to intracellular membrane and vice versa and they also help in the transfer of ions like sodium , potassium and chlorine and small lmolecules like glucose through their lipid bilayer .
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