Question

Atrioventricular septum is a
A. Thick fibrous tissue
B. Thin fibrous tissue
C. Thick muscular tissue
D. Thin muscular tissue

Answer 1

Hint: The atrioventricular septum is an organization that helps to separate the right atrium and the left ventricle. It usually stands between the interatrial septum and interventricular septum. It prevents the mixing of blood between two partitions.

Complete answer: The atrioventricular septum is a type of thick muscular partition that separates the atria from the ventricle of the heart. The septum is derived from the endocardial cushion in an atrioventricular canal. It opens only at the bicuspid and tricuspid valves. The endocardial cushions are formed at the ventral and dorsal part of the atrioventricular canal. The cushion tissue buds off and form future leaflets of the mitral and tricuspid valves. It is a membranous part of the interventricular septum that is located above the septal cusp roots of the mitral valve. Its development begins after the third week of the foetus. If the septum is not properly developed it can result in some abnormalities that will affect the normal physiologies of the heart. It is also known as atrioventricular septal defects (AVSDs). Atria receives blood, while ventricles pump it to different parts of the body.
Hence, the correct answer is option is C.

Note: During the development of the atrioventricular septum, leaflets are produced which are known as atrial. The valves are formed primarily from the connective tissue. It is also known as a septum intermedium or interstate barrier. It acts as a barrier and keeps the deoxygenated and oxygenated blood from crossing over.