Study Notes on Blood and the Cardiovascular System

Page 1:

Introduction to Blood

Page 2:

Cardiovascular System Components

• Blood: A specialized connective tissue.
• Heart: Functions as a pump.
• Blood Vessels: Circulate blood between the heart and cells. Components include:   - Elastic Arteries and Muscular Arteries.   - Arterioles and Capillaries.   - Venules and Veins.

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Vessel Dynamics and Exchange

• Directional Flow: Arteries carry blood away from the heart; veins return it to the heart.
• Microcirculation: Arterioles lead to capillaries, which then transition into venules.
• Capillary Exchange: Tissues receive oxygen and nutrients; waste products are removed.

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Primary Functions of Blood

• Distribution: Delivers $O_2$ and nutrients; removes wastes ($CO_2$ to lungs); transports hormones.
• Regulation: Maintains body temperature, tissue $pH$, and blood volume.
• Protection: Prevents blood loss through clotting and prevents infection.

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Composition of Whole Blood

• Plasma ($55\%$): Consists of $90\%$ water and various solutes.
• Formed Elements ($45\%$): Includes Erythrocytes (RBCs), Leukocytes (WBCs), and Platelets. RBCs comprise the vast majority of formed elements.

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Hematocrit and Physical Components

• Hematocrit: The percentage of blood volume composed of packed RBCs.   - Adult Males: $47\% \pm 5\%$   - Adult Females: $42\% \pm 5\%$
• Buffy Coat: A thin layer consisting of leukocytes and platelets situated between plasma and RBCs.

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Physical Characteristics and Volume

• Normal Blood Volume: Approximately $8\%$ of body weight.   - Adult Males: $5-6$ liters.   - Adult Females: $4-5$ liters.
• Traits: Sticky, opaque, and salty. Color ranges from scarlet ($O_2$ rich) to dark red ($O_2$ poor).
• Viscosity: $3-5$ times more viscous than water.
• $pH$ Range: $7.35 \text{--} 7.45$.
• Temperature: Approximately $38^{\circ}C$.

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Plasma Composition

• Plasma is the extracellular matrix of blood, composed of $91.5\%$ water and $8.5\%$ solutes.

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Plasma Proteins: Albumin

• Albumin: The most abundant plasma protein ($60\%$), produced by the liver.
• Function: Important for maintaining osmotic pressure and fluid balance between blood and interstitial fluid.

Questions & Discussion

Question: A severe liver disease has left a patient with reduced plasma protein levels. What happens to his blood volume? Response: [Context implies a decrease in blood volume/fluid shift due to loss of osmotic pressure].

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Albumin Transport Functions

Albumin serves as a transport protein for:

• Hormones and fatty acids.
• Unconjugated bilirubin.
• Various drugs.

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Additional Functions of Albumin

• Binds $Ca^{2+}$ ions.
• Serves as a buffer for $pH$ balance.
• Scavenges free radicals: Chemical species with an unpaired electron in the outer shell.

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Globulins

• Constitute $36\%$ of plasma proteins.
• Alpha and Beta Globulins: Produced by the liver; transport metal ions ($Fe^{2+}$, $Cu^{2+}$), cholesterol, and complement proteins.
• Transferrin: A specific protein bound to two iron atoms.

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Gamma Globulins

• Produced by plasma cells.
• Function as antibodies that bind to and help the immune system destroy germs.

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Summary of Plasma Proteins

• Albumins ($67\,kDa$): Maintenance of osmotic pressure; transport of fatty acids/bilirubin.
• $\alpha_1$-Globulins: Includes Antitrypsin and HDL (lipid transport).
• $\alpha_2$-Globulins: Ceruloplasmin (transports Copper) and Haptoglobin (binds hemoglobin).
• $\beta$-Globulins: Transferrin (iron transport) and LDL (lipid transport).
• $\gamma$-Globulins: Includes IgG, IgA, IgM, IgD, and IgE (antibodies).

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Clotting Proteins

• Constitute $4\%$ of plasma proteins; produced by the liver.
• Key proteins include fibrinogen and prothrombin.
• Function: Essential for coagulation.

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Organic Nutrients in Plasma

• Glucose and Amino acids.
• Lipids: Fatty acids, glycerol, triglycerides, and cholesterol.
• Vitamins.