BIOL 3755 Lecture Notes - Lecture 14: Heart Rate, Hemorheology, Erythropoiesis
Document Summary
3 principal components of circulatory system: heart, blood vessels or vascular system, blood (fluid connective tissue containing water, solutes, and cells that fills tubes) Erythrocytes: function gas transport, carry oxygen taken in by lungs and carbon dioxide produced by cells, contain large amounts of protein hemoglobin (with iron) to which oxygen and. Iron is transported in blood bound to iron transport plasma protein (transferrin) which delivers almost all of it to bone marrow to be incorporated into new erythrocytes. Iron is stored bound to protein called ferritin in liver, spleen, and small intestines. Innervation of heart: 1) initiation of action potentials at sa node, the pacemaker, 2) internodal pathway, 3) av node, 4) bundle of his, 5) right bundle branch, 6) purkinje fibers. Sequence of cardiac excitation: atrial excitation ventricular excitation ventricular relaxation. Cardiac cycle: orderly process of depolarization triggers recurring cardiac cycle of atrial and ventricular contractions and relaxations, systole, diastole.
