Uri Is Walking Home Alone on a Dark Night

question 46

Multiple Choice

Uri is walking home alone on a dark night. He hears a stick breaking and immediately turns to his right to see what made the noise. What cue could Uri have used to tell which direction the sound came from?

• A) the location along the basilar membrane stimulated by the sound
• B) the slight time difference between when the sound reached each ear
• C) the overall loudness of the sound
• D) the frequency of the sound

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Definitions:

Ulnar Artery

A major artery of the forearm that supplies blood to the flexor muscles of the hand and medial aspect of the forearm.

Right Ventricular Systole

The phase of the cardiac cycle during which the right ventricle of the heart contracts and pumps deoxygenated blood into the pulmonary arteries leading to the lungs.

Pulmonary Trunk

The major blood vessel that carries blood from the right ventricle of the heart to the lungs for oxygenation.

Pulmonary Veins

The veins that return oxygenated blood from the lungs to the left atrium of the heart, unlike most veins which carry deoxygenated blood.