Histology

Question 1

Osteocytes are connected by gap junctions

Question 2

Chromaffin cells are modified postganglionic sympathetic neurons derived from the neural crest that receive sympathetic input (neuendocrine cells). They are stimulated by Ach released from preganglionic neurons and secrete catecholamines (80% epi, 20% nor) directly into the bloodstream

Answer 2

Question 3

The A band always remains the same length during muscle contraction

The M line lies at the center of the A band and is where mysosin filaments anchor

I band is where actin does not overlap with myosin, and H band is where myosin does not overlap with actin. During contraction, both the H and I bands decrease in length