ANSC 23000 Lecture Notes - Lecture 1: Heart Valve, Pulmonary Vein, Pulmonary Artery
27 Sep 2018
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Apex: tip of the rounded part of the heart formed by the left ventricle. Two cavities: thoracic cavity (thorax): contains heart and lungs, abdominal cavity (abdomen): contains lower part of the esophagus, stomach, small intestine, colon, rectum, liver, gallbladder, kidneys, pancreas, spleen, and bladder. Heads in caudal direction when it contracts causing the thorax to get larger, increases the amount of negative pressure already there, and aids in drawing in air and returning blood to the heart. Made of skeletal muscle (needs neural input to tell it to contract: most domesticated animals have a 4-chambered heart. Left atrium: receives blood from lungs through pulmonary vein. Right atrium: receives blood from whole body through vena cava. Left ventricle: thicker than the right side because this chamber supplies the whole body with blood through the aorta. Right ventricle: thinner than the left side because it only supplies blood to the lungs through the pulmonary artery.
