Which of the following is a characteristic of cardiac myocytes?

Cardiac myocytes, or cardiac muscle cells, have several distinctive features, and one of their key characteristics is their length, which typically ranges from 25 to 100 micrometers. This size allows these cells to efficiently facilitate contraction and relaxation, contributing to the heart's ability to pump blood effectively.

In particular, the structured length of cardiac myocytes plays a crucial role in their function, enabling them to form intercalated discs that link adjacent cells together for synchronized contraction. This is essential for the coordinated beating of the heart. Additionally, this range in length supports the overall architecture of cardiac tissue, allowing for the mechanical and electrical coupling necessary for effective cardiac function.

The other characteristics listed are not typical of cardiac myocytes. For example, cardiac myocytes usually contain a single nucleus, are surrounded by relatively abundant capillary networks for nutrient and oxygen exchange, and they exhibit striations due to the organized arrangement of contractile proteins. Understanding the correct characteristics of cardiac myocytes is vital for those studying cardiovascular physiology and perfusion practices.