Physiology

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A Duchenne smile involves the contraction of the orbicularis oculi muscle

A non-Duchenne smile involves the contraction of the orbicularis oculi muscle

A Duchenne smile involves the contraction of the zygomatic major muscle

A non-Duchenne smile involves the contraction of the zygomatic major muscle

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To provide a mechanism for the body to distinguish its own cells and tissues from outside cells and substances

To extract, transport and metabolize lymph, the fluid found in between cells

To give the body basic structure and the ability for movement

To provide containment, structure, and protection for other organs, and serves as a major sensory interface with the outside world

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To transport oxygen, fuel, nutrients, waste products, immune cells and signalling molecules from one part of the body to another

To provide a mechanism for the body to distinguish its own cells and tissues from outside cells and substances

To extract, transport and metabolize lymph, the fluid found in between cells

To convert food into small, nutritional, non-toxic molecules for distribution and absorption into the body

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To pump blood to the lungs

To pump blood to the rest of the body

To allow uninterrupted venous blood flow to the heart during ventricular systole

To regulate the contractions and relaxation of the heart muscle

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The contraction of muscles in the penis

The relaxation of muscles in the penis

The dilation of arteries supplying blood to the penis

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