Activity 4: Microscopic Anatomy of Cardiac Muscle and Examining Cardiac Muscle Tissue Anatomy

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1

When the heart contracts, what happens to the size of the internal chambers?

They get smaller.

2

When the heart contracts, and the internal chambers become smaller, what happens to the blood?

It is forced into the large arteries leaving the heart.

3

In cardiac muscle cells, the cells interdigitate at which sites?

At the intercalated discs