Anatomy & Physiology II Exam Study Guide – Step-by-Step Guidance

Q1. What do Boyle’s Law and Henry’s Law each state? How are they different?

Background

Topic: Gas Laws in Respiratory Physiology

This question tests your understanding of two fundamental gas laws and their application to respiratory physiology, especially in the context of pulmonary ventilation and gas exchange.

Key Terms and Formulas

• Boyle’s Law: Describes the relationship between the pressure and volume of a gas at constant temperature.

• Henry’s Law: Describes how the amount of gas that dissolves in a liquid is proportional to its partial pressure and solubility.

Boyle’s Law Formula:

$P_1 V_1 = P_2 V_2$

Henry’s Law Formula:

$C = k P$

• $C$ = concentration of dissolved gas

• $k$ = Henry’s law constant (depends on gas and temperature)

• $P$ = partial pressure of the gas

Step-by-Step Guidance

1. Start by writing out the statement for each law in your own words. For Boyle’s Law, focus on how pressure and volume are inversely related when temperature is constant. For Henry’s Law, focus on how gas dissolves in liquid based on its partial pressure.

2. Think about where each law applies in the respiratory system. For example, Boyle’s Law is important during breathing (inspiration and expiration), while Henry’s Law is key for gas exchange between alveoli and blood.

3. Compare the two laws: What variable does each one focus on? How does each law relate to the movement or dissolution of gases in the body?

4. List at least one example of each law in action within the respiratory system (e.g., Boyle’s Law during inhalation, Henry’s Law during oxygen loading in the blood).

Try explaining the differences and applications before checking the answer!

Q2. Draw 4 pictures to show how Ventilation-Perfusion coupling occurs during times of: High O2, Low O2, High CO2, Low CO2

Background

Topic: Ventilation-Perfusion (V/Q) Coupling

This question tests your understanding of how the body matches airflow (ventilation) and blood flow (perfusion) in the lungs to optimize gas exchange, especially under different levels of oxygen and carbon dioxide.

Key Terms

• Ventilation: Airflow into and out of the alveoli.

• Perfusion: Blood flow in pulmonary capillaries.

• V/Q Coupling: The matching of ventilation and perfusion for efficient gas exchange.

Step-by-Step Guidance

1. For each scenario (High O2, Low O2, High CO2, Low CO2), think about what happens to the local blood vessels and airways in the lungs.

2. Recall that low O2 in alveoli causes vasoconstriction of local pulmonary arterioles, while high CO2 causes bronchodilation.

3. Sketch a simple diagram for each scenario, labeling alveoli, capillaries, and indicating whether vessels or airways are constricted or dilated.

4. For each drawing, add arrows to show the direction of airflow and blood flow, and note the physiological response (e.g., increased perfusion, decreased ventilation).

Try drawing and labeling your diagrams before reviewing the answer!

Q3. How are Natural Killer (NK) cells different from Cytotoxic T cells?

Background

Topic: Immune System – Cell Types

This question tests your understanding of the differences between two important types of immune cells involved in destroying infected or abnormal cells.

Key Terms

• Natural Killer (NK) Cells: Part of the innate immune system; destroy infected or cancerous cells without prior sensitization.

• Cytotoxic T Cells (CD8+): Part of the adaptive immune system; recognize and kill infected cells via antigen-specific mechanisms.

Step-by-Step Guidance

1. List the main function of each cell type in the immune response.

2. Identify which branch of the immune system (innate or adaptive) each cell belongs to.

3. Describe how each cell recognizes its targets (e.g., antigen-specific recognition for T cells, general abnormality detection for NK cells).

4. Note any differences in activation requirements or memory formation between the two cell types.

Try listing the differences before checking the answer!

Q4. State several functions of fever to defend for not medicating low grade fevers.

Background

Topic: Immune Response – Fever

This question tests your understanding of the physiological benefits of fever and why it may not always be necessary to treat low-grade fevers with medication.

Key Terms

• Fever: An elevation in body temperature as part of the immune response.

• Pyrogens: Substances that induce fever.

Step-by-Step Guidance

1. List at least three physiological functions of fever that help the body fight infection (e.g., inhibiting pathogen growth, enhancing immune cell activity).

2. Explain how fever can create an environment less favorable for pathogens.

3. Discuss why suppressing a low-grade fever might not always be beneficial for recovery.

Try listing the functions before checking the answer!

Q5. What is the role of the central and peripheral chemoreceptors in breathing?

Background

Topic: Respiratory Regulation

This question tests your understanding of how the body monitors and responds to changes in blood gases to regulate breathing.

Key Terms

• Central Chemoreceptors: Located in the medulla oblongata; respond primarily to changes in CO2 and pH in cerebrospinal fluid.

• Peripheral Chemoreceptors: Located in carotid and aortic bodies; respond to changes in O2, CO2, and pH in arterial blood.

Step-by-Step Guidance

1. Describe where each type of chemoreceptor is located in the body.

2. Explain which blood gas (O2, CO2, or pH) each receptor is most sensitive to.

3. Discuss how signals from these receptors influence the respiratory centers in the brain to adjust breathing rate and depth.

Try explaining the roles before checking the answer!