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Updated: June 23, 2025
The left semilunar valve is around the opening of the left ventricle into the aorta, and is similar in all respects to the right semilunar valve. *Differences in the Parts of the Heart.*—Marked differences are found in the walls surrounding the different cavities of the heart.
The arterial canal contains no membrane or valve to direct or impede the flow of blood in this or in that direction: for at the root of the pulmonary artery, of which the arterial canal is the continuation in the foetus, there are three semilunar valves, which open from within outwards, and oppose no obstacle to the blood flowing in this direction or from the right ventricle into the pulmonary artery and aorta; but they prevent all regurgitation from the aorta or pulmonic vessels back upon the right ventricle; closing with perfect accuracy, they oppose an effectual obstacle to everything of the kind in the embryo.
The passage leading to the right ventricle lies open, and through it the blood pours till the ventricle is full. Instantly this begins, in its turn, to contract. The tricuspid valve at once closes, and blocks the way backward. The blood is now forced through the open semilunar valves into the pulmonary artery.
The short sound follows quickly after the dull sound and the two are fairly imitated by the words "lūbb, dŭp." While the cause of the first sound is not fully understood, most authorities believe it to be due to the contraction of the heart muscle and the sudden tension on the valve flaps. The second sound is due to the closing of the semilunar valves.
Kite, killed by a game-cock. Knot, retention of winter plumage by the. Knox, R., on the semilunar fold; on the occurrence of the supra-condyloid foramen in the humerus of man; on the features of the young Memmon. Koala, length of the caecum in. Kobus ellipsiprymnus, proportion of the sexes in. Kolreuter, on the sterility of hybrid plants. Koodoo, development of the horns of the; markings of the.
He then dwelt upon the merits of fire-arrows and fire-pikes in the attack or defence of places of strength, and had finally begun to descant upon sconces, 'directis lateribus, and upon works, semilunar, rectilineal, horizontal, or orbicular, with so many references to his Imperial Majesty's lines at Gran, that it seemed that his discourse would never find an end.
Muller, Hermann, emergence of bees, from pupa; pollen-gathering of bees; proportion of sexes in bees; courting of Eristalis; colour and sexual selection with bees. Muller, J., on the nictitating membrane and semilunar fold. Muller, Max, on the origin of language; language implies power of general conception; struggle for life among the words, etc., of languages.
Oh, no! but what dull ache is this in that obscurely sensitive region, somewhere below the heart, where the nervous centre called the semilunar ganglion lies unconscious of itself until a great grief or a mastering anxiety reaches it through all the non-conductors which isolate it from ordinary impressions?
Selection, methodical, of Prussian grenadiers. Selection, sexual, explanation of; influence of, on the colouring of Lepidoptera. Selection, sexual and natural, contrasted. Self-command, habit of, inherited; estimation of. Self-consciousness, in animals. Self-preservation, instinct of. Self-sacrifice, by savages; estimation of. Semilunar fold. Semnopithecus, long hair on the heads of species of.
The body is made up of separately woven bands, upon which disk-like and semilunar figures representing human faces are stitched, covering the surface in horizontal rows. To the center of these rosette-like parts clusters of tassels of varying sizes are attached.
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