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

• Immunity

• Fluid balance

• Absorption of fats

Step-by-Step Guidance

1. Start by recalling the three primary 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 lymphatic organs and tissues in defending the body against pathogens.

4. Remember the involvement of the lymphatic system in absorbing fats from the digestive tract.

Try solving on your own before revealing the answer!

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

Background

Topic: Lymphatic System Physiology

This question focuses on the quantitative aspect of fluid recovery by the lymphatic system, which is essential for maintaining fluid balance in the body.

Key Terms:

• Interstitial fluid

• Lymph

• Fluid homeostasis

Step-by-Step Guidance

1. Recall the approximate volume of fluid filtered out of capillaries into the interstitial space each day.

2. Think about how much of this fluid is reabsorbed directly into the blood and how much is returned via the lymphatic system.

3. Remember the typical value (in liters) that is often cited in textbooks for daily lymph return.

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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 and Characteristics

This question tests your knowledge of the composition of lymph, its similarities to other body fluids, and the reason for its appearance.

Key Terms:

• Lymph

• Plasma

• Chyle

• White appearance

Step-by-Step Guidance

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

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

3. Consider what gives lymph its white or milky appearance, especially after a meal.

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

Background

Topic: Lymphatic Capillaries Structure and Function

This question asks you to define lymphatic capillaries, recognize their alternate name, and understand their role in the lymphatic system.

Key Terms:

• Lymphatic capillaries

• Lacteals

• Permeability

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.

3. Think about their structural features that allow them to absorb fluid and larger particles.

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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 compares the structure and function of lymphatic capillaries to blood capillaries, focusing on permeability and what substances can enter.

Key Terms:

• Permeability

• Endothelial cells

• One-way valves

Step-by-Step Guidance

1. List the structural differences between lymphatic and blood capillaries (e.g., overlapping endothelial cells, absence of basement membrane).

2. Explain how these differences affect what can enter the lymphatic capillaries.

3. Consider the types of substances (e.g., proteins, debris, pathogens) that can enter lymphatic capillaries but not blood capillaries as easily.

Try solving on your own before revealing the answer!