Heart Anatomy and Functions

Define myocardium: Specialized heart muscle. When one part contracts the whole muscle contracts, ejecting blood from one chamber to the next. It adds strength due to the thickness of the tissue.

• Myocardium is a specialized heart muscle that contracts as a whole, ejecting blood and adding strength due to its thickness.

• Myocardium is a thin layer of tissue that does not contribute to heart contraction.

• Myocardium is a type of nerve tissue found in the heart.

• Myocardium is a non-essential part of the heart that does not affect its function.

The bicuspid valve is also known as the:

• Tricuspid valve

• Mitral valve

• Aortic valve

• Pulmonary valve

Cardiac muscle resembles:

• Skeletal muscle

• Smooth muscle

• Both skeletal and smooth muscle

• Neither skeletal nor smooth muscle

Define pericardium: doubled walled heart's protective sac. Stabilizes the heart and buffers it from contact with the chest cavity.

• A double-walled sac that protects the heart

• A single-walled sac that protects the heart

• A muscle that pumps blood

• A valve that regulates blood flow

The three layers of the heart (inner to external) are:

• Endocardium, Myocardium, Epicardium

• Epicardium, Myocardium, Endocardium

• Myocardium, Endocardium, Epicardium

• Epicardium, Endocardium, Myocardium

The endocardium is the innermost layer of which organ?

• Heart

• Liver

• Kidney

• Lung

The myocardium is the muscular tissue of which organ?

• Liver

• Heart

• Kidney

• Lung

What is epicardium?

• The outer layer of the heart wall

• A type of blood vessel

• A chamber of the heart

• A type of heart valve

The mediastinum is a part of the body located in which area?

• Abdominal cavity

• Thoracic cavity

• Pelvic cavity

• Cranial cavity

Define Intercalated disks: cardiac muscle fibers that are long cells fitting together tightly at junctions.

• Intercalated disks are specialized connections between cardiac muscle cells.

• Intercalated disks are a type of bone tissue.

• Intercalated disks are found in the brain.

• Intercalated disks are a type of skin cell.