If the Beating Heart Makes a ʺLub-Dupʺ Sound, the ʺDupʺ

question 101

Multiple Choice

If the beating heart makes a ʺlub-dupʺ sound, the ʺdupʺ sound is caused by

• A) the apex of the heart hitting the anterior chest wall.
• B) vibrations that result from the semilunar valves slamming shut.
• C) a stenotic atrioventricular valve.
• D) the large force of the contracting ventricles.

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Definitions:

Retinal Ganglion Cell

A type of neuron located in the retina that receives visual information from photoreceptors via intermediate bipolar cells and amacrine cells.

On-centers

Cells in the retina that are stimulated when light hits the center of their receptive field, contributing to the initial processing of visual information.

Temporal Lobe

A region of the cerebral cortex responsible for processing auditory information, and also involved in memory and speech.

Parietal Lobe

One of the four major lobes of the cerebral cortex, playing a key role in processing sensory information such as touch, temperature, and pain.