Step-by-Step Guidance for Cardiovascular Anatomy & Physiology Exam III Study Guide

Q1. What are the functions of blood? Give examples of how these functions are carried out.

Background

Topic: Blood Functions

This question tests your understanding of the major roles blood plays in the body and your ability to provide specific examples for each function.

Key Terms:

• Transport (e.g., gases, nutrients, hormones)

• Regulation (e.g., pH, temperature, fluid balance)

• Protection (e.g., immune response, clotting)

Step-by-Step Guidance

1. List the three main functions of blood: transport, regulation, and protection.

2. For each function, think of at least one specific example (e.g., transport: oxygen carried by hemoglobin; regulation: maintaining body temperature; protection: white blood cells fighting infection).

3. Explain briefly how blood carries out each function (e.g., how plasma transports nutrients, how platelets help with clotting).

Try solving on your own before revealing the answer!

Q2. What is the composition of whole blood?

Background

Topic: Blood Composition

This question asks you to recall the main components of blood and their relative proportions.

Key Terms:

• Plasma

• Formed elements (erythrocytes, leukocytes, platelets)

Step-by-Step Guidance

1. Identify the two major components: plasma and formed elements.

2. List what is found in plasma (e.g., water, proteins, nutrients, hormones).

3. List the types of formed elements and their functions.

Try solving on your own before revealing the answer!

Q3. Describe the structural characteristics of erythrocytes and relate this to complementarity of function.

Background

Topic: Erythrocyte Structure and Function

This question tests your understanding of how the structure of red blood cells supports their role in oxygen transport.

Key Terms:

• Biconcave shape

• Lack of nucleus/organelles

• Hemoglobin content

Step-by-Step Guidance

1. Describe the biconcave shape and explain how it increases surface area for gas exchange.

2. Discuss the absence of a nucleus and organelles, and how this maximizes space for hemoglobin.

3. Relate these features to the cell’s ability to efficiently transport oxygen and carbon dioxide.

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Q4. Describe the structure of hemoglobin. How many oxygen molecules can bind? What makes a hemoglobin fully saturated?

Background

Topic: Hemoglobin Structure and Oxygen Binding

This question focuses on the molecular structure of hemoglobin and its oxygen-carrying capacity.

Key Terms:

• Globin chains

• Heme groups

• Oxygen binding sites

• Oxygen saturation

Step-by-Step Guidance

1. Describe the quaternary structure of hemoglobin (number of chains and heme groups).

2. State how many oxygen molecules each hemoglobin can bind (one per heme group).

3. Define what is meant by “fully saturated” hemoglobin.

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Q5. Describe loading/unloading of O2 / CO2. Where does each occur and why? You should be VERY familiar with the PO2 / O2 saturation graphs. Where is hemoglobin 100% saturated? When is it 75% saturated? What happens to saturation during exercise?

Background

Topic: Gas Exchange and Hemoglobin Saturation

This question tests your understanding of how and where oxygen and carbon dioxide are loaded and unloaded, and how this relates to the oxygen-hemoglobin dissociation curve.

Key Terms and Concepts:

• Partial pressure of oxygen ($PO_2$)

• Oxygen-hemoglobin dissociation curve

• Loading (lungs) vs. unloading (tissues)

• Effect of exercise on $O_2$ saturation

Step-by-Step Guidance

1. Explain where oxygen loading (binding to hemoglobin) occurs and why (relate to high $PO_2$ in lungs).

2. Explain where oxygen unloading occurs (tissues with lower $PO_2$) and why this is important.

3. Describe how the $O_2$-hemoglobin dissociation curve shows saturation at different $PO_2$ values (e.g., 100% in lungs, 75% in resting tissues).

4. Discuss what happens to hemoglobin saturation during exercise (increased unloading at tissues).

Try solving on your own before revealing the answer!