BIO 215 Lecture Notes - Lecture 7: Vascular Resistance, Hemorheology, Cardiac Output
Document Summary
Factors affecting circulation: pressure differences that drive the blood flow. Blood pressure: resistance to flow, venous return. An interplay of force results in blood flow. Speed of blood flow in cm/sec is inversely related to the cross sectional area: blood flow is slower in the arterial branches. Flow in aorta is 40cm/sec while flow in capillaries is . 1 cm/sec. This slow rate in capillaries allows for proper exchanges (02,c02,nutrients, wastes: blood flow becomes faster when vessels merge to form veins. Circulation time is the time it takes to drop if blood to travel from the right atrium back to the right atrium. Arterial tree: (aorta)is the trunk, then vessels branching off. Velocity blood flow gr8ter in systolic phase then the diastolic phase that"s the pulsing and relaxation of the heart. Velocity is slow on the right ventricle. Time from where you track the circulation time** exam material.
