It Is Estimated That the Prevalence of Smoking in a Population

question 29

Multiple Choice

It is estimated that the prevalence of smoking in a population is 50%.  A cohort study conducted using a random sample from this population showed that the 5-year risk of ischemic stroke is 1:1000 among smokers and 0.5:1000 among non-smokers. What percentage of ischemic strokes observed in smokers can be attributed to their smoking status?

• A)10%
• B)25%
• C)33%
• D)50%
• E)75%

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Definitions:

Myosin Myofilament

Thick myofilament of muscle fibrils; composed of myosin molecules.

Sarcomere

The basic unit of striated muscle tissue responsible for muscle contraction, delimited by Z discs.

Spastic Contractions

Involuntary muscle contractions that are sudden and sustained, often resulting from spinal cord injury or neurological disorders.

Synaptic Cleft

A narrow space between the end of a neuron and an adjacent cell, where neurotransmitters are released to transmit signals.