United States or Ghana ? Vote for the TOP Country of the Week !
Further, in all true fishes the heart has only two sections an atrium that receives the venous blood from the veins, and a ventricle that propels it through a conical artery to the gills; the atrium was now divided into two halves, or right and left auricles, by an incomplete partition.
Often in the first stage of this weakening and later fibrillation of the auricles the patient may recognize the cardiac irregularity and disturbances. Generally, however, he soon becomes accustomed to the sensations, and, unless he has cardiac pains or dyspnea, he becomes oblivious to the irregularity.
He says: "After the heart had ceased pulsating an undulation or palpitation remained in the blood itself which was contained in the right auricle, this being observed so long as it was imbued with heat and spirit." He recognized too the importance of the auricles as the first to move and the last to die.
The heart, therefore, ceases to pulsate sooner than the auricles, so that the auricles have been said to outlive it, the left ventricle ceasing to pulsate first of all; then its auricle, next the right ventricle; and, finally, all the other parts being at rest and dead, as Galen long since observed, the right auricle still continues to beat; life, therefore, appears to linger longest in the right auricle.
And when they talk of you as familiarly as if they had taken out your auricles and ventricles, and turned them inside out, and wrung them, and shaken them, when they prate of your transparency and openness, the abandonment with which you draw aside the curtain and reveal the inmost thoughts of your heart, you, who are to yourself a miracle and a mystery, you smile inwardly, and are content.
Of this time one-fifth is occupied by the contraction of the auricles, two-fifths by the contraction of the ventricles, and the time during which the whole heart is at rest is two-fifths of the period. Impulse and Sounds of the Heart. The rhythmic action of the heart is attended with various occurrences worthy of note.
These differences in structure are all accounted for by the work done by the different portions of the heart. The greater the work, the heavier the structures that perform the work. The right ventricle forces the blood through the lungs and into the left auricle. The left ventricle forces blood through all parts of the body and back to the auricle. The auricles force blood into the ventricles.
The offices of the auricles and the ventricles are subverted. The blood is sent forth by the veins, and returns by the arteries. Consequently it is running the wrong way through all her corporeal organism lungs and all. Is it then all mysterious, seeing that such is the case, that on the other particular of gravitation as well, she should differ from normal humanity?
It may be worth remarking, as a proof how tenacious the walrus sometimes is of life, that the animal killed to-day struggled violently for ten minutes after it was struck, and towed the boat twenty or thirty yards, after which the iron of the harpoon broke; and yet it was found, on examination, that the iron barb had penetrated both auricles of the heart.
Heart of a human embryo, six weeks old, front view. r right ventricle, t left ventricle, s furrow between ventricles, ta arterial bulb, af furrow on its surface; to right and left are the two large auricles.
Word Of The Day