Blood and Lymph

Lymphatic System

Animal Biology

Lesson Objectives

• Identify the structure and function of the lymphatic system

• Identify the formation and constitution of lymph

• Review the role of the lymphatic system within immunity 

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Open Ended

RECAP: What are the 4 main components of the blood?

Multiple Select

Select the boxes that describe a red blood cell. Hint: there are 3 correct answers

• Have a nucleus

• Spherical

• Do not contain a nucleus

• Biconcave

• Contain haemoglobin

Multiple Choice

Which valve is located between the left atrium and left ventricle?

• Mitral

• Tricuspid

• Pulmonary

• Semilunar

• Aortic

Lymphatic System

• A network of tissues and organs that help rid the body of toxins, waste and other unwanted materials

• Primary function is to transport lymph

• Lymph - fluid containing white blood cells

More key functions!

Link to Health & Disease

• The lymphatic system enables an immune response

• This immune response is a secondary line of defence against disease

• Physical and chemical barriers first!

Open Ended

List as many physical and chemical barriers as you can remember!

Physical Barriers

• Skin

• Mucous membranes

• Hair

• Bronchial cilia

Chemical Barriers

• Saliva

• Lysozymes

• Gastric juice

• Sebum

• Hydrochloric acid

Composition of Lymph

• WBCs - especially lymphocytes

• Blood plasma

• Fats

• Water

• Glucose

• Protein

Lymphatic structures

• Spleen

• Tonsils

• Thymus

• Lymph nodes

• Lymph vessels

• Lymph!

Spleen

Controls the amount of erythrocytes in the body and is where B-cells mature.

B-cells are responsible for producing antibodies

Thymus

Located in front of the heart and is where T-cells mature

T-cells are responsible for destroying virus-infected cells and instruct the body to release of WBCs to target infection

Lymph Nodes and Vessels

• Nodes - these filter the lymph to get rid of toxins, waste and pathogens

• Vessels - act like veins and capillaries to transport lymph

Multiple Choice

Which cells produce antibodies?

• B-cells

• T-cells

Multiple Choice

Which cells are responsible for destroying virus infected cells?

• B-cells

• T-cells

Open Ended

Practice exam question: justify the need for a lymphatic system in mammals (4 marks)

Multiple Choice

Where are B-cells matured?

• Thymus

• Tonsils

• Spleen

Multiple Choice

Where are T-cells matured?

• Thymus

• Tonsils

• Spleen

Research Task

• Research the structure and function of antibodies

• Research at least 3 types of leukocytes and describe their role in the immune response

• How do the lymphatic system and the cardiac system work together effeiciently?

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