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What About Frog Sushi??

What About Frog Sushi??. The Heart has an innate beating mechanism that can be regulated without the central nervous system…..This topic is explored in PHYSIOLOGY ….Here is some of the anatomy of this innate beating system Involves a”pacemaker” and series of conducting fibers……see next slide.

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What About Frog Sushi??

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  1. What About Frog Sushi?? • The Heart has an innate beating mechanism that can be regulated without the central nervous system…..This topic is explored in PHYSIOLOGY ….Here is some of the anatomy of this innate beating system • Involves a”pacemaker” and series of conducting fibers……see next slide.

  2. Blood Vessels: The Vascular System • Taking blood to the tissues and back • Arteries • Arterioles • Capillaries • Venules • Veins Figure 11.8a

  3. Blood Vessels • Arteries- Are have thick walls and are Elastic. They Carry blood away from the heart. Arteries become smaller arterioles and branch into capillaries. • Veins-Carry blood to the Heart. Veins become smaller venules and and connect with the capillaries • Capillaries - Exchanges between cells and nutrients/oxygen occur here

  4. The Vascular System Figure 11.8b

  5. Blood Vessels: Anatomy • Three layers (tunics) • Tunic intima • Endothelium • Tunic media • Smooth muscle • Controlled by sympathetic nervous system • Tunic externa • Mostly fibrous connective tissue

  6. Differences Between Blood Vessel Types • Walls of arteries are the thickest • Lumens of veins are larger • Skeletal muscle “milks” blood in veins toward the heart • Walls of capillaries are only one cell layer thick to allow for exchanges between blood and tissue

  7. 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

  8. Capillary Beds • True capillaries – exchange vessels • Oxygen and nutrients cross to cells • Carbon dioxide and metabolic waste products cross into blood Figure 11.10

  9. Capillary Exchange: Additional Mechanisms • Direct diffusion across plasma membranes • Endocytosis or exocytosis • Fenestrations of some capillaries • Fenestrations = pores

  10. Major Arteries of Systemic Circulation Figure 11.11

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