Question

1. A group of students is reviewing the structures of the heart, noting that the thickest layer of the heart is made up of contractile muscle cells. The students are correct in identifying this layer as which of the following?

A) Myocardium
B) Epicardium
C) Endocardium
D) Pericardium

Answer 1

The thickest layer of the heart is called the myocardium. It is made up of contractile muscle cells and is responsible for the contraction of the heart.

Step-by-step explanation:

The thickest layer of the heart is called the myocardium. It is made up of contractile muscle cells and is the middle layer of the heart wall. The myocardium consists of cardiac muscle cells that are responsible for the contraction of the heart, which allows it to pump blood through the body.

Answer 2

The correct answer is A) Myocardium.

The myocardium is the middle layer of the heart and is composed of contractile muscle cells called cardiomyocytes. These muscle cells are responsible for the contraction and pumping action of the heart, allowing it to effectively circulate blood throughout the body. The myocardium is thicker in the left ventricle compared to the other chambers of the heart, reflecting the greater workload required for pumping oxygenated blood to the body's tissues. The epicardium is the outermost layer of the heart, the endocardium is the innermost layer lining the heart chambers, and the pericardium is the protective sac that surrounds the heart.