Which functional unit of muscle is shown on the micrograph?

Match the GI tract structure below with the correct epithelium found in its mucosa.

Identify the endocrine structure on the micrograph below that releases insulin and glucagon. Click on the image to below to select your answer.

The adventitia of large arteries and veins have a unique feature identified on the micrograph below with blue ovals. What are these structures and what purpose do they serve?  

In which fluid-filled compartment does the circled structure reside?

To which category of vein would this belong?

What is the function of this fragment?

Identify the structure circled (in blue) on the micrograph.

Match the layers of the heart on the left with the corresponding letter on the micrograph.

Match the tissue on the left with its correct location on the micrograph below.