OSX Microbiology Test Bank Chapter 25 Exam Questions Practice Test Bank 2025/ 2026

OpenStax Microbiology Test Bank
Chapter 25: Circulatory and Lymphatic System Infections

Chapter 25: Circulatory and Lymphatic System Infections

* = Correct answer

Multiple Choice

1. Where does oxygenated blood enter the heart?
A. the left atrium*
B. the left ventricle
C. the right atrium
D. the right ventricle

Difficulty: Easy
ASM Standard: N/A

2. Which artery carries deoxygenated blood?
A. aorta
B. femoral
C. pulmonary*
D. subclavian

Difficulty: Easy
ASM Standard: N/A

3. Which of the following is an infection of the inner lining of the heart?
A. endocarditis*
B. myocarditis
C. pericarditis
D. vasculitis

Difficulty: Easy
ASM Standard: 23

4. Which pathogen causes toxic shock syndrome?
A. Enterococcus faecalis
B. Pseudomonas aeruginosa
C. Staphylococcus aureus*
D. Vibrio cholerae

Difficulty: Easy
ASM Standard: 23

5. Which pathogen causes gas gangrene?
A. Bacillus spp.
B. Clostridium spp.*
C. Staphylococcus spp.
D. Streptococcus spp.

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,OpenStax Microbiology Test Bank
Chapter 25: Circulatory and Lymphatic System Infections


Difficulty: Easy
ASM Standard: 23

6. What is another name for tularemia?
A. brucellosis
B. rabbit fever*
C. toxic shock syndrome
D. Valley fever

Difficulty: Easy
ASM Standard: 23

7. The gram-negative bacterium Yersinia pestis causes which disease(s)?
A. bubonic plague only
B. bubonic and septicemic plague only
C. pneumonic and septicemic plague only
D. bubonic, pneumonia, and septicemic plague*

Difficulty: Easy
ASM Standard: 23

8. Which of the following infections is transmitted by ticks?
A. brucellosis
B. ehrlichiosis*
C. plague
D. rat bite fever

Difficulty: Easy
ASM Standard: N/A

9. Which organ of the human body removes damaged red blood cells?
A. heart
B. kidneys
C. liver*
D. pancreas

Difficulty: Moderate
ASM Standard: N/A

10. Which of the following is true of lymphatic fluid?
A. It contains erythrocytes.
B. It is sterile.
C. It travels at slower speeds than blood.*
D. Its fluid composition is very different from plasma.



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, OpenStax Microbiology Test Bank
Chapter 25: Circulatory and Lymphatic System Infections

Difficulty: Moderate
ASM Standard: N/A

11. Which of the following is a type of primary lymphoid tissue?
A. bone marrow*
B. diffuse lymphoid tissue
C. lymph nodes
D. the spleen

Difficulty: Moderate
ASM Standard: N/A

12. What is a dangerous drop in blood pressure associated with infection called?
A. bacteremia
B. hypotensive shock
C. sepsis
D. septic shock*

Difficulty: Moderate
ASM Standard: 23

13. Which of the following is true of staphylococcal toxic shock syndrome?
A. Most infected individuals have negative serological tests even if infected.
B. Most infected individuals have negative skin and blood cultures.*
C. Most infected individuals test negative, so clinical symptoms are used for diagnosis.
D. Most infected individuals test positive in both serological tests and cultures.

Difficulty: Moderate
ASM Standard: 23

14. Instead of basing diagnosis solely on clinical symptoms and patient history, what common
approach is used to confirm a tularemia infection?
A. culturing techniques
B. direct fluorescent antibody microscopic examination*
C. light microscopy and Gram staining.
D. phase-contrast microscopy

Difficulty: Moderate
ASM Standard: 6, 23

15. Which of the following individuals would be most likely to receive antibiotics for cat scratch
disease?
A. an individual likely to be repeatedly exposed to infected cats
B. an individual undergoing cancer treatment simultaneously*
C. an individual who exhibits a fever
D. an individual who develops pus nodules at the site of the scratch


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