Chapter 17, Section 3Blood and Lymph

Thursday, March 18, 2010

Pages 549 -- 554

Objectives

• Learn the four components of blood.

• Understand what determines the type of blood that a person can receive in transfusion.

Vocabulary Words

• Plasma• Red Blood Cells• Hemoglobin• White Blood Cells• Platelets

• Fibrin• Blood transfusion• Lymphatic system• Lymph• Lymph nodes

Components of Blood

• There are four components of blood.– Plasma– Red blood cells– White blood cells– Platelets

Red Blood Cells

• Red blood cells (RBC) carry oxygen from the lungs to the body.

• Made up of mostly hemoglobin.– Hemoglobin is an iron-

containing protein that binds chemically to oxygen molecules.

• RBCs are produced in the bone marrow.

• RBCs have no nuclei.

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Plasma

• Plasma is the liquid part of blood.

• Plasma is mostly water.

• 10% is dissolved materials such as food molecules, vitamins, minerals, waste products, and plasma proteins.

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White Blood Cells• White blood cells (WBCs)

are made in the bone marrow.

• They are bigger than RBCs.• They have a nuclei.• Their job is to alert the body

when disease-causing organisms invade.

• They produce chemicals to fight invaders or surround and kill the disease-causing organisms.

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This is a picture of WBCs attacking bacteria.

Platelets• Platelets are cell

fragments that help form blood clots.

• They collect and stick to any site where a blood vessel is cut.

• Chemicals are released that cause production of fibrin.– Fibrin is a chemical that

weaves a net of fibers across a wound that traps blood cells that form a clot.

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Blood Transfusion

• Blood transfusion is the tranference of blood from one person to another.

• The marker molecules on your RBCs determine your blood type and the type of blood you can safely receive in a transfusion.

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Blood Types

• There are four types of blood.– Type A– Type B– Type AB– Type O

• Each type has different marker molecules.

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Blood Type A

• Blood type A has an A marker.

• Blood type A can receive transfusions of type A or O because they do not have a B marker.

Blood Type B

• Blood type B has a B marker.

• People with blood type B can receive transfusions of blood type B or O because they do not have an A marker.

Blood Type O

• People with type O blood have both anti-A and anti-B clumping proteins.

• Blood type O can only receive type O blood.

• Nick-named the Universal Giver – Anyone can receive type O blood

Blood Type AB

• People with type AB blood have no clumping proteins.

• They can receive all blood types.

• Nick-named the Universal Recipient.

The Lymphatic System

• The lymphatic System is a network of vessels that returns the fluid to the bloodstream.

• Fluid that enters the lymphatic system is called lymph.

• Lymph nodes are small knobs of tissue that filter the lymph as it passes through.

Homework

• Workbook 17.3 (3/22)

• Vocabulary quiz 17.3 (3/23)