Question

Myocardium is a special muscle tissue found only in the

• A. Brain
• B. Heart
• C. Stomach
• D. Lungs

Hint:

Myocardium is essential for the contraction of the heart and is found only in the heart.

Answer 1

The Correct Option is B

Myocardium refers specifically to cardiac muscle tissue, so we can check which organ contains that tissue type.

1. Brain: Made of neural tissue, not muscle.
2. Heart: Correct - myocardium is the cardiac muscle layer of the heart, found nowhere else.
3. Stomach: Contains smooth muscle, a different tissue type.
4. Lungs: Contains smooth muscle in airways, not cardiac muscle.

So the correct answer is Heart.

Answer 2

A more specific way to confirm this is through a unique structural feature of cardiac muscle - the presence of intercalated discs, specialized junctions that let heart muscle cells contract in a synchronized wave - and check which organ has tissue with this feature.

1. Brain: Composed of neurons and glial cells, which communicate via synapses, not intercalated discs, a completely different type of cell junction.
2. Heart: The myocardium's cardiac muscle cells are connected end-to-end by intercalated discs, which allow electrical signals to pass rapidly between cells so the whole heart contracts in a coordinated rhythm, this feature exists only in cardiac tissue.
3. Stomach: Smooth muscle cells in the stomach wall are connected by gap junctions in some regions, but they lack the specific intercalated-disc architecture unique to cardiac muscle.
4. Lungs: Lung tissue does not contain muscle cells with intercalated discs at all.

Tracing this unique structural feature leads to the same organ.

Hence, the correct answer is Heart.