The Reason a Life Jacket Helps Keep You Afloat Is

question 67

Multiple Choice

The reason a life jacket helps keep you afloat is

• A)the jacket makes you weigh less.
• B)the jacket has the same density as an average human.
• C)the jacket repels water.
• D)if you sink, the jacket sinks.
• E)the density of both you and the jacket together is less than your density alone.

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Definitions:

Peristaltic Waves

Sequential muscle contractions that occur in the digestive tract, moving food through the esophagus to the stomach and intestines.

Erythropoietin

A hormone produced mainly by the kidneys that promotes the formation of red blood cells in the bone marrow.

Blood PH

Refers to the measure of the acidity or alkalinity of blood, vital for maintaining homeostasis in the human body.

Renin

An enzyme produced by the kidneys that plays a key role in regulating blood pressure by controlling the conversion of angiotensinogen to angiotensin I.