Many biological structures are composed of smaller units assembled into more complex structures having functions based on their structural organization. for the following complex structures, describe the smaller units, their assembly into the larger structures, and one major function of these larger, organized structures. an inner membrane of a mitochondrion.

The inner membrane of mitochondria contains many proteins, has no pores and is very selective; It contains many enzyme complexes and transmembrane transport systems, which are involved in translocation of molecules. This membrane forms invaginations or folds called mitochondrial ridges, which considerably enlarge the surface for affixing these enzymes. In most eukaryotes, the folds form flattened partitions perpendicular to the mitochondrial axis, but some protists have a tubular or discoid shape. In the composition of the inner membrane there is a great abundance of proteins (80%), which are, moreover, exclusive of this organ, namely:

1. The electron transport chain, consisting of four fixed enzyme complexes and two mobile electron transporters:

2- An enzymatic complex, the H + ATP synthetase channel that catalyzes the synthesis of ATP (oxidative phosphorylation).

3- Carrier proteins that allow ions and other molecules to pass through the membrane, such as fatty acids, pyruvic acid, ADP, ATP, O2 and water. The following mitochondrial transporters may be highlighted:

which condition is a cause of impotency in men?

b. the inability of the penis to become erect