The Place in a Planet's Orbit That Is Closest to the Sun

question 5

Multiple Choice

The place in a planet's orbit that is closest to the Sun is called:

• A)vernal equinox.
• B)aphelion.
• C)perihelion.
• D)crossing the ecliptic.
• E)None of these; a planet's distance from the Sun never changes.

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Definitions:

P Wave

The first wave in an ECG, representing the depolarization of the atria before the heart beats.

QRS Complex

Principal deflection in the electrocardiogram, representing ventricular depolarization.

T Wave

Deflection in an electrocardiogram following the QRS complex, representing ventricular repolarization.

Repolarization

The process of restoring the resting negative charge inside a neuron or muscle cell after depolarization.