CHAP19_2402 - BIOLOGY 2402 Anatomy and Physiology Lecture...

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BIOLOGY 2402 Anatomy and Physiology Lecture CHAPTER 19 THE CARDIOVASCULAR SYSTEM THE BLOOD
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THE CARDIOVASCULAR SYSTEM – THE BLOOD (As cells become more differentiated, they become less capable of carrying on an independent existence) Example: Specialized cells are less able to: a. Protect themselves from extreme temperature, toxic chemicals, and changes in pH b. Cannot seek food or devour whole bits of food; c. Cannot move away from their own wastes, if firmly implanted in a tissue Interstitial Fluid (also known as Intercellular or Tissue fluid ) - bathes cells and carries out the above mentioned functions for them. Extracellular fluid - composed of interstitial fluid. * Blood plasma and lymph service the interstitial fluid, blood, plasma, and other fluids. All termed as fluids outside of cells. * Blood and lymph, in turn service the interstitial fluids. (Picks oxygen from the lungs, nutrients from the gastrointestinal tract, and hormones from endocrine glands). ** Since the blood services all the tissues of the body it can be an important medium for the transport of disease-causing organisms (pathogens). * Lymphatic System (a collection of lymphatic tissue and lymph vessels that contain a fluid called lymph) is the body's mechanism to protect itself from organisms.
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