Sub 1[1].2   form 5
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Sub 1[1].2   form 5 Sub 1[1].2 form 5 Presentation Transcript

  • CHAPTER 1:TRANSPORT1.2 The Concept ofCirculatory System
  • LEARNING OUTCOME• Describe the structure of human blood vessels
  • STRUCTURE OF HUMAN BLOOD VESSELS• Tubes that transport blood from one part to another in the human body View slide
  • 3 types of human blood vessels View slide
  • • Transport blood to the heart. •Connect arterioles to venules •Transport blood away from the heart
  • A R T E R IES• Carry blood away from the heart• Branch into smaller vessels  arterioles  capillaries• To transport blood quickly & at high pressure to the tissues.• Arteries walls consist of epithelial tissue, smooth
  • CAPILLARIES• The sites for the exchange of nutrients, respiratory gases & waste products.• Thin-walled blood vessels which allow rapid gaseous exchange to occur, only one- cell thick.• Capillaries  venules  veins
  • VEINS• Transport blood back to the heart• Consist of epithelial tissue surrounded by smooth muscle (thinner than arteries) & connective tissue• Blood flows under low pressure• Have large lumens & valves that maintain the one-way flow of blood
  • Differences between arteries, capillaries & veins A r t e r ie s C a p il l a r ie s V e in s Transport blood away Connect arterioles to Transport blood to the from the heart venules heart Transport oxygenated Act as the sites for Transport deoxygenated blood (except the exchange of substances blood (except the pulmonary artery) with the cells pulmonary vein) Thick muscular wall Thinnest wall, one cell in Thinner wall thickness No valves except semi- No valves Valves present to preventlunar valves at the base of back flow of blood the aorta & pulmonary artery Blood flows in pulse No pulses; pressure lower No pulses; blood flows under high pressure than arteries but higher under lower pressure than than veins arteries