A Parfocal Microscope

question 40

Multiple Choice

A parfocal microscope:

• A) requires a polarized light source.
• B) requires the use of a fluorescent light source.
• C) allows for ease of focusing when switching from low to high power.
• D) has two ocular lenses.
• E) eliminates the need to stain the specimen to be viewed.

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Definitions:

SA Node

The sinoatrial node, often regarded as the heart's natural pacemaker, initiates electrical impulses that determine the heart rate.

AV Node

The Atrioventricular Node, a critical component of the heart's electrical system, responsible for controlling the timing of heart muscle contractions.

Bundle of His

A group of specialized heart muscle cells that are designed for electrical signaling, responsible for carrying impulses from the AV node to the heart's ventricles.

Pulmonic Valve

The heart valve that separates the right ventricle from the pulmonary artery and regulates blood flow to the lungs.