The capacity of the atrium increases when a wrinkled structure called the auricle is attached to the surface of an atrium. Because of this, there is an increase in the blood volume.
The expandable extension of the atrium is the atrial appendage, also known as the auricle. It helps to increase the overall capacity of the atrium to hold blood.
atrium
auricle
There will be higher pressure in the left atrium, when there is mitral stenosis. There will dilatation of the left atrium as well as there will hypertrophy of the left atrium. There will raise in the pulmonary veins. This will lead to pulmonary edema. This will eventually lead to high pressure in pulmonary arteries. That is called as pulmonary hypertension. The pressure in right ventricle will increase. Then the pressure in the right atrium will increase. Then the pressure in the systemic venous side will increase. This will lead to right sided heart failure.
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The plural is atria. This can be used architecturally or with reference to chambers of the heart.
The left auricular appendix (left auricula, left auricle, left atrial appendage) is a conical muscular pouch connected to the left atrium of the heart. It is somewhat constricted at its junction with the principal cavity; it is longer, narrower, and more curved than theright auricular appendix, and its margins are more deeply indented.
Contraction of veins would increase venous return to the right atrium. It would increase the efficiency of the heart pumping.
If you increase the area which an animal lives, the carrying capacity will go up.