How many muscles does it take to smile?

In spite of what you might have heard or read in an e-mail, science doesn't have a definitive number. People's smiles vary; some people have more facial muscles than others, giving them a wider range of expression.

Continue Learning about Functions of Muscles

What is the most important muscle for improving my vertical jump height?
National Academy of Sports MedicineNational Academy of Sports Medicine
This common question is not easily answered.  Many muscles contribute to a vertical leap, includ...
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What are involuntary muscle activities?
Ms. Ashley Koff, RDMs. Ashley Koff, RD
Involuntary muscle activities are going on continuously to keep you alive. Your heart, which itself ...
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What is the Phosphagen System?
Discovery HealthDiscovery Health
Every muscle cell has some amount of ATP. Adenosine triphosphate (ATP) is the way your body uses bio...
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When will I start to lose lean muscle mass?
Dr. Vonda Wright, MDDr. Vonda Wright, MD
We lose lean muscle mass beginning around age 50. By age 80, we have lost 50 percent of our lean mus...
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.