A&P II Exam 2 Study Guide: Lymphatic, Immune, and Respiratory Systems

Q1. What are the functions of the lymphatic system?

Background

Topic: Lymphatic System Overview

This question tests your understanding of the main roles the lymphatic system plays in the body, including fluid balance, immune defense, and absorption of dietary fats.

Key Terms:

• Lymphatic system: A network of vessels and organs that helps maintain fluid balance and protect against infection.

• Immunity: The body's ability to resist infection.

• Absorption of fats: The process by which dietary fats are absorbed from the digestive tract.

Step-by-Step Guidance

1. Start by recalling the three main functions of the lymphatic system. Think about how it interacts with the circulatory and immune systems.

2. Consider how the lymphatic system helps return excess interstitial fluid to the bloodstream.

3. Think about the role of lymph nodes and lymphatic organs in defending the body against pathogens.

4. Remember the role of the lymphatic system in absorbing fats from the digestive tract, specifically in the small intestine.

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Q2. How much fluid is returned per day by the lymphatic system?

Background

Topic: Fluid Balance

This question is about the volume of fluid that the lymphatic system returns to the bloodstream each day, which is important for maintaining blood volume and pressure.

Key Terms:

• Interstitial fluid: Fluid that surrounds tissue cells.

• Lymph: The fluid that is collected by lymphatic vessels and returned to the blood.

Step-by-Step Guidance

1. Recall the approximate amount of fluid that leaves the capillaries and enters the interstitial space each day.

2. Think about how much of this fluid is reabsorbed directly by the blood capillaries versus how much is collected by the lymphatic system.

3. Remember the typical value (in liters) that is returned to the bloodstream via the lymphatic system daily.

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Q3. Lymph is similar to which other fluid? List the components of lymph. Why is it white?

Background

Topic: Lymph Composition

This question asks you to compare lymph to other body fluids, identify its components, and explain its appearance.

Key Terms:

• Lymph: Fluid in the lymphatic system.

• Plasma: The liquid component of blood.

• Chyle: Lymph that contains absorbed fats, giving it a milky appearance.

Step-by-Step Guidance

1. Think about which body fluid lymph most closely resembles in terms of composition.

2. List the main components found in lymph (e.g., water, proteins, white blood cells, etc.).

3. Consider why lymph appears white, especially after a fatty meal, and what substance is responsible for this color.

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Q4. What are lymphatic capillaries? What is another term for them?

Background

Topic: Lymphatic Capillaries

This question focuses on the structure and alternative names for lymphatic capillaries.

Key Terms:

• Lymphatic capillaries: Small, thin-walled vessels where interstitial fluid enters the lymphatic system.

• Lacteals: Specialized lymphatic capillaries in the small intestine.

Step-by-Step Guidance

1. Define what lymphatic capillaries are and where they are found in the body.

2. Recall the special name for lymphatic capillaries in the small intestine and their function.

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Q5. How are lymphatic capillaries different from systemic capillaries? How does their structure affect their permeability?

Background

Topic: Capillary Structure and Function

This question examines the structural differences between lymphatic and blood capillaries and how these differences influence what can enter the lymphatic system.

Key Terms:

• Permeability: The ability of substances to pass through a membrane or vessel wall.

• Endothelial cells: Cells lining the inside of capillaries.

Step-by-Step Guidance

1. Compare the structure of lymphatic capillaries to that of blood capillaries, focusing on the arrangement of endothelial cells.

2. Explain how the unique structure of lymphatic capillaries (e.g., overlapping endothelial cells) affects their permeability.

3. Consider what types of substances can enter lymphatic capillaries due to this increased permeability.

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