Multiple Choice
Which of the following proteins are not found in the ECM
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18. Cell Junctions and Tissues
Extracellular Matrix of Animal Cells
Multiple Choice
In the extracellular matrix of animal tissues, which connective tissue layer surrounds an individual muscle cell (muscle fiber)?
A
Perimysium
B
Endomysium
C
Sarcolemma
D
Epimysium
Verified step by step guidance1
Understand the hierarchical organization of muscle tissue: muscle tissue is composed of muscle fibers (cells), which are grouped into fascicles, and the entire muscle is surrounded by connective tissue layers.
Identify the connective tissue layers and their locations: Epimysium surrounds the entire muscle, Perimysium surrounds each fascicle (a bundle of muscle fibers), and Endomysium surrounds each individual muscle fiber (muscle cell).
Recall that the sarcolemma is the plasma membrane of a muscle fiber, not a connective tissue layer.
Match the connective tissue layer to the structure it surrounds: since the question asks for the layer surrounding an individual muscle cell, the correct connective tissue is the Endomysium.
Summarize that the Endomysium is the thin layer of connective tissue that wraps each muscle fiber, providing support and a pathway for capillaries and nerves.
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