Fossils of Neanderthals Were First Discovered

question 22

Multiple Choice

Fossils of Neanderthals were first discovered

• A)in the 1980s.
• B)in 1925.
• C)around the turn of the 20^th century.
• D)during Darwin's lifetime.

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Definitions:

Cardiac Cycle

The complete sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, including systole and diastole phases.

Diastole

The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.

Heart Chambers

The four compartments of the heart including two atria and two ventricles, involved in pumping blood throughout the body.

Cardiac Conduction System

A system of specialized muscle tissues in the heart that initiates and coordinates the contraction of the heart, regulating its rhythm.