Question 1

Which of the following best describes the function of cerebrospinal fluid (CSF) in the central nervous system?

Accepted Answer

It provides nutrients and removes waste from brain tissue, while also cushioning the brain and spinal cord.

Question 2

A patient presents with inflammation of the membranes surrounding the brain and spinal cord. What is the medical term for this condition?

Accepted Answer

Meningitis

Question 3

Which bacterial species is responsible for causing tetanus, and what is the primary effect of its toxin on the human body?

Accepted Answer

Clostridium tetani; causes spastic paralysis by blocking inhibitory neurotransmitter release.

Question 4

Botulism is often associated with improperly canned foods. Which of the following best explains why?

Accepted Answer

Anaerobic conditions in canned foods allow Clostridium botulinum spores to germinate and produce exotoxin.

Question 5

Which of the following statements about botulinum toxin is correct?

Accepted Answer

It is an exotoxin that blocks acetylcholine release at neuromuscular junctions.

Question 6

Botox injections are used medically for which of the following purposes?

Accepted Answer

To reduce muscle spasms and wrinkles by temporarily paralyzing targeted muscles.

Question 7

Polio is caused by a virus that primarily enters the human body through which route?

Accepted Answer

Ingestion of contaminated water or food

Question 8

What was the main reason for the dramatic drop in polio cases in the United States during the 1950s and 1960s?

Accepted Answer

Widespread vaccination campaigns

Question 9

A patient is bitten by a wild animal and later develops neurological symptoms such as agitation and hydrophobia. Which pathogen is most likely responsible, and how does it enter the body?

Accepted Answer

Rabies virus; enters through the bite wound and travels via peripheral nerves to the CNS.

Question 10

Cryptococcus neoformans is classified as which type of microbe, and how does it typically enter the human body?

Accepted Answer

Fungus; inhalation of spores from the environment

Question 11

Trypanosoma brucei, the causative agent of African sleeping sickness, is classified as which type of microbe, and how does it enter the human body?

Accepted Answer

Protozoan; bite from a tsetse fly

Question 12

Naegleria fowleri is a rare but deadly pathogen. Which of the following best describes its classification and route of entry into the human body?

Accepted Answer

Protozoan; entry through the nasal passages during exposure to contaminated water

Question 13

Why is it important to use sterilized water in Neti pots?

Accepted Answer

To avoid introducing Naegleria fowleri, which can cause fatal brain infection if contaminated water enters the nasal cavity

Question 14

A lumbar puncture (spinal tap) is performed to collect cerebrospinal fluid for analysis. Which of the following is a primary reason for this procedure in a patient with suspected meningitis?

Accepted Answer

To detect the presence of pathogens or abnormal cells in the CSF

Question 15

Which of the following best distinguishes between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all nerves outside the CNS.

Question 16

A patient develops both meningitis and encephalitis simultaneously. What is the correct term for this condition?

Accepted Answer

Meningoencephalitis

Question 17

Which of the following equations best represents the calculation of the concentration of a pathogen in cerebrospinal fluid if 10 cells are found in a 0.01 mL sample?

Accepted Answer

$$C = \frac{N}{V}$$, where $$N = 10$$ cells and $$V = 0.01 mL$$, so $$C = 1000$$ cells/mL

Question 18

A patient presents with sudden onset of muscle rigidity and spasms after stepping on a rusty nail. Which of the following best explains the pathogenesis of the disease?

Accepted Answer

The bacterium produces an exotoxin that blocks inhibitory neurotransmitter release, leading to uncontrolled muscle contraction.

Question 19

Which of the following scenarios best illustrates the application of herd immunity in the context of polio eradication?

Accepted Answer

A high percentage of the population is vaccinated, reducing the overall transmission of the poliovirus and protecting unvaccinated individuals.

Microbiology Exam 5 Study Guide – Nervous System Infections

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