blood - 17 Blood (RBC) Chapter 17: Blood 1 Overview of...

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Chapter 17: Blood 1 17 Blood (RBC)
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Chapter 17: Blood 2 Overview of Blood Circulation Oxygen (O ) and nutrients diffuse across capillary walls and enter tissues
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Chapter 17: Blood 3 Overview of Blood Circulation Oxygen-deficient blood leaves the capillaries and flows in veins to the heart This blood flows to the lungs where it releases CO 2 and picks up O 2 The oxygen-rich blood returns to the heart
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Chapter 17: Blood 4 Composition of Blood Blood is the body’s only fluid tissue It is composed of liquid plasma and formed elements Formed elements include: Erythrocytes , or red blood cells (RBCs) Leukocytes , or white blood cells (WBCs) Platelets Hematocrit – the percentage of RBCs out of the total blood volume
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Chapter 17: Blood 5 Components of Whole Blood Figure 17.1 Withdraw blood and place in tube 1 2 Centrifuge Plasma (55% of whole blood) Formed elements Buffy coat: leukocyctes and platelets (<1% of whole blood) Erythrocytes (45% of whole blood)
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Chapter 17: Blood 6 Physical Characteristics and Volume Blood is a sticky , opaque fluid with a metallic taste Color varies from scarlet (oxygen-rich) to dark red (oxygen- poor) The pH of blood is 7.35–7.45 Temperature is 38 ° C , slightly higher than “normal” body temperature Blood accounts for approximately 8% of body weight Average volume of blood is 5–6 L for males , and 4–5 L for females
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Chapter 17: Blood 7 Functions of Blood Blood performs a number of functions dealing with: Substance distribution Regulation of blood levels of particular substances Body protection
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Chapter 17: Blood 8 Distribution Blood transports: Oxygen from the lungs and nutrients from the digestive tract Metabolic wastes from cells to the lungs and kidneys for elimination Hormones from endocrine glands to target organs
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Chapter 17: Blood 9 Regulation Blood maintains: Appropriate body temperature by absorbing and distributing heat Normal pH in body tissues using buffer systems Adequate fluid volume in the circulatory system
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Chapter 17: Blood 10 Protection Blood prevents blood loss by: Activating plasma proteins and platelets Initiating clot formation when a vessel is broken Blood prevents infection by: Synthesizing and utilizing antibodies Activating complement proteins Activating WBCs to defend the body against foreign invaders
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Chapter 17: Blood 11 Blood Plasma Blood plasma contains over 100 solutes , including: Proteins albumin , globulins, clotting proteins, and others Nonprotein nitrogenous substances lactic acid , urea, creatinine Organic nutrients glucose , carbohydrates, amino acids Electrolytes sodium , potassium , calcium, chloride, bicarbonate Respiratory gases oxygen and carbon dioxide
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Chapter 17: Blood 12 Formed Elements Erythrocytes , leukocytes , and platelets make up the formed elements Only WBCs are complete cells
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blood - 17 Blood (RBC) Chapter 17: Blood 1 Overview of...

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