Get 11c Notes sheet from front On your notes: Identify some things that can happen as a result of low blood pressure Identify some things that can result from high blood pressure

Blood Vessels 11c

The Vessel System Much like the roadway system through the body Freeways Surface Streets Alleys

Blood Vessels: The Vascular System Function: Taking blood to the tissues and back Arteries Arterioles Capillaries Venules Veins Slide 11.23 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

The Vascular System Slide 11.24 Figure 11.8b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Blood Vessels Arteries Function: Carry blood away from the heart Thick, strong vessel walls Very high pressure Part of the Freeway System

The Vascular System Slide 11.24 Figure 11.8b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Blood Vessels Capillaries Function: allow transfer of substances between blood and body cells Smallest blood vessels - only 1 cell thick!!! Connect on one side to arterioles and on the other side to venules Like the alleyways of the vascular system

The Vascular System Slide 11.24 Figure 11.8b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Blood Vessels Veins Function: bring blood back to the heart Thinner than arteries Not as much pressure Have valves to help keep blood moving back toward the heart Very low pressure Part of the freeway system

The Vascular System Slide 11.24 Figure 11.8b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Movement of Blood Through Vessels Most arterial blood is pumped by the heart Veins use the milking action of muscles to help move blood Figure 11.9 Slide 11.27 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Capillary Beds True capillaries – exchange vessels Oxygen and nutrients cross to cells Carbon dioxide and metabolic waste products cross into blood Figure 11.10 Slide 11.28b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Diffusion at Capillary Beds Figure 11.20 Slide 11.29 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Heart Attack! Answer question #1 solo. You will get a chance to talk with other people. Read 2-4