The Timing of Puberty Seems to Be Affected in Part

question 13

Multiple Choice

The timing of puberty seems to be affected in part by environmental causes. For example, puberty occurs early for:

• A) Girls in families with higher incomes
• B) Both boys and girls who engage in risky behaviors
• C) Both boys and girls in families with low income
• D) Girls in families with a lot of conflict

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Definitions:

Ventricular Diastole

Dilation of the heart ventricles.

ECG

Electrocardiogram, a test that measures the electrical activity of the heart over a period of time.

Cardiac Cycle

refers to the sequence of events that occur in the heart during one beat, including the contraction (systole) and relaxation (diastole) periods.

Diastole

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