Textbook / WB pages Textbook: p. 356-366, p. 370-373, p. 382-386, p. 389-390 WB 205-209, 212-213, 224-225,228-229 http://qrmhsalvarez.weebly.com/

Blood Vessels

Capillary System

Capillary exchange

Distribution of Blood

Control of Blood Nervous system Kidneys (water, volume, pressure) 3. Temperature Chemicals ex. Epinephrine Diet (low salt, fat, cholesterol)

Cardiac cycle – relaxation and contraction Diastole – relaxed heart, atria contract Systole – atria relax, ventricles contract Left atrium Right atrium Left ventricle Right ventricle Ventricular filling Atrial contraction Isovolumetric contraction phase Ventricular ejection phase Isovolumetric relaxation 1 2 3 Mid-to-late diastole (ventricular filling) Ventricular systole (atria in diastole) Early diastole

Blood Pressure Systolic pressure 120 contraction Diastolic pressure 80 relaxation Healthy range: 90-120 60-80 Blood Pressure Blood pressure is the force that blood exerts against the inner walls of blood vessels. Although this force occurs throughout the vascular system, the term "blood pressure" most commonly refers to pressure in arteries supplied by branches of the aorta. The oscillating pressure in these arteries produces a "pulse." Arterial Blood Pressure Arterial blood pressure rises and falls in a pattern corresponding to the phases of the cardiac cycle. That is, contracting ventricles (ventricular systole) squeeze blood out and into the pulmonary trunk and aorta, which sharply increases the pressures in these arteries. The maximum pressure during ventricular contraction is called the systolic pressure. When the ventricles relax (ventricular diastole), arterial pressure drops, and the lowest pressure that remains in the arteries before the next ventricular contraction is the diastolic pressure.