BIO 106 Lecture Notes - Lecture 6: Arteriole, Hepatic Portal System, Coronary Circulation
Document Summary
Record of electrical changes in heart muscles during the cardiac cycle. Atria produce electrical current called p wave when stimulated by sa node. Contraction of ventricles is the qrs complex. Recovery of ventricles is called the t wave. Atria are receiving chambers, have lower pressure than ventricles. For every systolic event, it will be followed by a diastolic event. Highest pressure called systolic pressure takes place during the blood ejection from the heart. Lowest pressure called diastolic pressure takes place when ventricles relax. Slower in the capillaries, important to allow time for exchange between cells. Minimal in the veins and venules but blood flow increases. Arteries and veins either transport blood away from or towards the heart. Every inch of the body is covered by capillaries. Hydrostatic pressure is driving blood through arteries, no pressure is required for blood to flow through the veins. Right side of heart that brings blood from body to the heart and lungs.
