Topic: Circulatory System
Aim: Describe the structure and function of the 3 types of blood vessels. Do Now: Practice Questions HW: Read pgs Write a paragraph describing enzymes, their role in digestion and their role in other life processes. (Packing Fat Reading Comprehension due on Monday!) Review: Identify the part of blood being described.
Most numerous blood cell. Carries enzymes. Involved in blood clotting. Carries oxygen. Largest blood cell. Made up of 90% water. Protect the body against disease. Carries hormones. Did you know The body of an adult contains over 60,000 miles of blood vessels! An adult's heart pumps nearly 4000 gallons of blood each day! The average three-year-old has two pints of blood in their body. The average adult has at least five times more! Arteries Capillaries Veins Capillaries Arteries Veins Branching arteries in the eye Capillaries Arteries Veins Capillaries Arteries Veins Capillary diameter is very small.
A typical small artery or vein may be 5mm (in diameter in a human) But a capillaries are approx 10 micrometer about the size of a red blood cell (erythrocyte) Arteries Capillaries Veins Arteries AWAY from heart THICK and ELASTIC Experiences most pressure (PULSE) Capillaries Veins Experiences most pressure (PULSE)
Arteries AWAY from heart THICK and ELASTIC Experiences most pressure (PULSE) Capillaries SMALLEST Connect arteries to veins Exchange (diffusion) of materials bw blood and cells - O2: from alveoli into capillaries - CO2 and H2O vapor: capillaries alveoli Veins Experiences most pressure (PULSE)
Arteries AWAY from heart THICK and ELASTIC Experiences most pressure (PULSE) Capillaries SMALLEST Connect arteries to veins Exchange (diffusion) of materials bw blood and cells - O2: from alveoli into capillaries - CO2 and H2O vapor: capillaries alveoli Veins TO the heart THIN and NOT VERY ELASTIC VALVES (prevent backflow of blood) Artery Vein ARTERIES CAPILLARIES VEINS Blood vessels in the right arm and shoulder Arteries of the lower leg & blood supply to the face & skull Lets summarize Identify the three types of blood vessels. Why are arteries very muscular? Identify where each type of blood vessel carries blood? Why are capillaries so thin? Why do veins have valves? In which blood vessel is your pulse felt? Explain why. Review: Identify the type of blood vessel being described.
Low blood pressure Where diffusion of substances occurs. Contains valves Carry blood away from the heart Connects arteries and veins Red blood cells move in single file Elastic and flexible. Used to feel pulse.