...of flesh, but contains several cavities." " I perfectly remember the appearance of the slice I tyad. There was a layer of flesh on the outside, and the...action of the heart depends. Like other muscles, it has the1 power of contracting ; and when it contracts, the sides of its cavities are squeezed together,...

...The engine that works this curious machinery is the heart. The heart is composed of four cavities. Like other muscles, it has the power of contracting...sides of its cavities are squeezed together, so as to force out any fluid the heart may at that moment contain. This purpose being effected the fibres relax,...

...The engine that works this curious machinery is the heart. The heart is composed of four cavities. Like other muscles, it has the power of contracting...sides of its cavities are squeezed together, so as to force out any fluid the heart may at that moment contain. This purpose being effected, the fibres relax,...

...chamber above. You already know that this diaphragm is a stout, strong, muscular partition. Like all other muscles, it has the power of contracting, and when it contracts its muscular fibres are shortened, so that the dome or arch is pulled down and flattened. This contraction,...