Final answer:
Desmosomes are a type of junctional complex in animal cells that act like spot welds between adjacent epithelial cells, enabling tissues to remain cohesive and strong, particularly in organs that stretch.
Step-by-step explanation:
True, desmosomes are indeed a type of junctional complex. They are specialized cellular structures found in animal cells that function like spot welds, binding adjacent epithelial cells tightly together. Desmosomes are formed from proteins called cadherins which span the plasma membrane and connect to intermediate filaments, such as keratin, within the cell. This connection provides strength and cohesion to cells within tissues, particularly those that experience stretching, like skin, heart, and muscles.
In addition to the strong adhesive properties, desmosomes allow the passage of materials in the intracellular spaces, facilitating communication and the transfer of substances between cells without compromising the structural integrity of tissues.