Blood Flow in Birds and Mammals rest of body lungs right atrium left atrium right ventricle left ventricle In birds and mammals, the heart is fully partitioned into two halves. Blood circulates in two circuits: from the heart’s right half to lungs and back, then from the heart’s left half to oxygen-requiring tissues and back.
Tuần hoàn cơ thể capillary beds of head and upper extremities (to pulmonary circuit) aorta (from pulmonary circuit) heart capillary beds of other organs in thoracic cavity capillary bed of liver capillary beds of intestines
Tuần hoàn phổi right pulmonary artery left pulmonary artery capillary bed of right lung pulmonary trunk capillary bed of left lung (to systemic circuit) pulmonary veins lungs (from systemic circuit) heart
right lung left lung diaphragm pericardium rib cage 1 2 3 4 5 6 7 8
superior vena cava (from head, upper limbs) right semilunar valve (shown closed); to the pulmonary trunk right pulmonary veins (from lungs) right atrium right AV valve (shown open) right ventricle (muscles that prevent valve from everting) inferior vena cava (from trunk, legs) septum (partition between heart's two halves) myocardium heart’s apex arch of aorta trunk of pulmonary arteries left semilunar valve (shown closed); to aorta left pulmonary veins (from lungs) left atrium left AV valve (shown open) left ventricle endothelium and underlying connective tissue inner layer of pericardium
Blood Pressure <ul><li>Highest in arteries, lowest in veins </li></ul><ul><li>Systolic pressure is __________________(ventricular contraction) </li></ul><ul><li>Diastolic pressure is the lowest </li></ul><ul><li>Greatest pressure drop is in arterioles </li></ul>