BIOL164Ch11NotesWin12

BIOL164Ch11NotesWin12 - 1 The Cardiovascular(Circulatory...

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Unformatted text preview: 1 The Cardiovascular (Circulatory) System • Function : to transport nutrients, gases, hormones, wastes, immune cells, etc. throughout the body • Is made up of the following parts : – The fluid = blood , which is a fluid connective tissue (Ch. 11) – The pump = the heart (Ch. 12) – The pipes/tubes/hoses = blood vessels (Ch. 12) Figure 12.1 Ch. 11 – Blood • Is the “river of life” • = a specialized fluid connective tissue that contains cells (called “formed elements”) suspended within a watery liquid matrix (= plasma) 2 The functions of blood • 1. Transportation of: – Gases, nutrients, hormones, metabolic wastes, heat, etc. • 2. Protection , via: – The restriction of fluid loss at injury sites • Due to hemostasis and blood clotting – Defense against toxins and pathogens • By white blood cells and antibodies • 3. Regulation of: – The pH and ion composition of blood and interstitial (extracellular) fluid • Blood contains buffers • Free diffusion between the blood and interstitial fluid eliminates ion differences between them – Body temperature • Blood can absorb, redistribute, and/or dissipate body heat Characteristics of normal whole blood • 1. Its temperature is ~ 38°C (100.4°F) • 2. Viscosity = stickiness/cohesiveness/ thickness – Blood is 5X more viscous than water – Blood that has abnormally ↑ viscosity causes ↑ resistance to blood flow, making the heart work harder to pump it • 3. pH = 7.35-7.45 (slightly alkaline) • 4. Blood volume is primarily dependent on body size – In an adult male: 5-6 liters – In an adult female: 4-5 liters 3 The composition of whole blood Figure 11.1 Plasma • Is similar to interstitial fluid, except plasma has a much (~ 5X) higher protein...
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This note was uploaded on 03/12/2012 for the course BIOL 164 taught by Professor Tonychennault during the Winter '12 term at Clark College.

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BIOL164Ch11NotesWin12 - 1 The Cardiovascular(Circulatory...

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