In a tissue type that undergoes a relatively great deal of mechanical stress, like the tissue that lines the intestine, you would expect to see an abundance of between the individual cells of the tissue. gap junctions desmosomes connexons tight junctions

The answer is desmosomes. These are inter-cellular hyper-adhesive between cells that prevent easy tear from mechanical stress.  They bestow mechanical strength to tissue. They are found in tissues such as the cardiac tissue and epithelia. Desmosomes are composed of intermediate filaments.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.