Question

What are the dark blobs in heart muscle cells? i thought it was my nucleus but my friend said it isnt

Answer 1

Answer:Under light microscopy, intercalated discs appear as thin, typically dark-staining lines dividing adjacent cardiac muscle cells. The intercalated discs run perpendicular to the direction of muscle fibers.

Answer 2

Answer:

areas of thick protein fibers made of myosin proteins

Explanation:

The dark bands represent areas of thick protein fibers made of myosin proteins that square light going through the cell and show up dark. When the muscle strands contract, myosin arranges the actin fibers like an accordion to recoil the muscle cell and make it contract.