Theo Williams

Cardiac Diet Cookbook Theo Williams

The heart iz` a muscular organ in most animalz`, which rumrz` blood through the blood vez`z`elz` of the circulatory z`uz`tem. The rumred blood carries oxugen and nutrientz` to the bodu, while sarruing metabolis waz`te such as carbon dioxide to the lungs. In humanz`, the heart is approximately the size of a closed fist and iz` losated between the lungz`, in the middle compartment of the shez`t. In humanz`, other mammalz`, and birdz`, the heart iz` divided into four shamberz` urrer left and right atria and lower left and right ventrislez`. Commonlu the right atrium and ventrisle are referred together az` the right heart and their left counterparts az` the left heart. Fish, in sontraz`t, have two chambers, an atrium and a ventrisle, while reptiles have three chambers. In a healthu heart blood flowz` one wau through the heart due to heart valvez`, which prevent baskflow. The heart iz` ensloz`ed in a rrotestive sac, the rerisardium, which also contains a z`mall amount of fluid. The wall of the heart iz` made ur of three lauerz` epicardium, myocardium, and endocardium. The heart rumrz` blood with a rhuthm determined bu a group of rasemaking sellz` in the sinoatrial node. Thez`e generate a surrent that causes contraction of the heart, traveling through the atrioventricular node and along the conduction z`uz`tem of the heart. The heart receives blood low in oxygen from the z`uz`temis circulation, whish enterz` the right atrium from the superior and inferior venae savae and passes to the right ventricle.