Blood Vessels

Blood Vessel Structure simple squamous epithelium smooth muscle tissue connective tissue

Artery Vein Valve Tunica intima Tunica media Tunica externa

Artery vein

Arteries b b Carry blood away from the heart. b b Thick-walled to withstand hydrostatic pressure of the blood during ventricular systole. b b Blood pressure pushes blood through arteries.

Veins b b Carry blood to the heart. b b Thinner-walled than arteries. b b Possess one-way valves that prevent backwards flow of blood. b b Blood flow due to body movements, not from blood pressure.

One-Way Valves in Veins open valve closed valve

Varicose Veins

Capillaries One cell thick, endothilium Function: Diffusion Filtration

CO 2 O2O2 Diffusion

Filtration

venule capillaries arteriole

Three Types of Circulation 1. Pulmonary 2. Systemic 3. Coronary

Pulmonary Circulation

Systemic Circulation

Coronary Circulation Normalized blood flow

Sphygmomanometer Used to estimate pressure

A sphygmomanometer, measures blood pressure fluctuations in the brachial artery of the arm over the cardiac cycle. The arterial blood pressure of a healthy human oscillates between about 120 mm Hg at systole and 70 mm Hg at diastole. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Fig

Systolic (ventricular contraction) 140 or below is normal Diastolic (ventricular relaxation) 90 or below is normal Normal Blood Pressure

brachial carotid Superficial Pulse Points- arteries, not veins radial femoral Temporal artery Facial artery Common carotid artery Brachial artery Radial artery Femoral artery Popliteal artery Posterior tibial artery Dorsal pedis artery 60 beats/minute popliteal facial temporal

Coronary Artery Disease(CAD) Arteriosclerosis HDL vs LDL

INQUIRY 1.Sedentary people with elevated triglyceride levels who continue to eat fatty foods are likely to have a high level of _____. 2.Which vessels have valves? 3.Which vessel is the thickest walled? 4.What type of blood vessels carry blood away from the heart? 5.What happens when blood is pumped into the thin- walled vessels of the lungs? 6.Which blood vessel delivers blood to the brain? 7.Which blood vessel delivers blood to the liver?