Figure 21.4 Using the Above Figure, Identify the Labeled Structure(s) in Each

question 92

Multiple Choice

Figure 21.4

Using the above figure, identify the labeled structure(s) in each of the following questions.
-Identify the structure(s) indicated by Label S.

• A) Papillary muscle
• B) Interatrial septum
• C) Moderator band
• D) Interventricular septum
• E) Pectinate muscle

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Definitions:

Adhesion Junctions

Specialized structures in cells that help in the binding of cells with each other or with the extracellular matrix.

Gap Junctions

Specialized intercellular connections that facilitate the direct transfer of ions and small molecules between the cytoplasms of adjacent cells.

Tight Junctions

Specialized connections between neighboring cells that create a barrier to prevent the leakage of molecules across cell layers.

Plasmodesmata

Microscopic channels allowing transport and communication between plant cells, enabling the sharing of water, nutrients, and biochemical signals.