Goosebumps occur when the arrector pili muscles contract. A lot of factors can cause this reaction, some benign and others more serious.

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Mental health professional prescribes anti-depressant to male patient

asian chinese couple watching scary horror tv show at night during weekend in living room sitting on sofa

sick at home

Woman warming hands on cold day.

Woman's legs with goosebumps

Goose bumps - human skin reaction on the cold

Skin Goosebumps closeup

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Anatomy

<div class="" data-block="true" data-editor="8v4h4" data-offset-key="1smsj-0-0">
<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="1smsj-0-0"><span data-offset-key="1smsj-0-0">Anatomy is a branch of biology. This branch of science in particular deals with organisms and their biological structure. Human anatomy, along with physiology and biochemistry, forms the basis of medicine.</span></div>
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<div class="" data-block="true" data-editor="8v4h4" data-offset-key="e054a-0-0">
<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="e054a-0-0"><span data-offset-key="e054a-0-0"> </span></div>
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<div class="" data-block="true" data-editor="8v4h4" data-offset-key="8jihb-0-0">
<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="8jihb-0-0"><span data-offset-key="8jihb-0-0">Some parts that make up the body's structure are </span><span class="adverb"><span data-offset-key="8jihb-1-0">incredibly</span></span><span data-offset-key="8jihb-2-0"> complex. Take the circulatory system, for example, which contains the heart and blood vessels. This system </span><span class="complexword"><span data-offset-key="8jihb-3-0">handles a lot of responsibility.</span></span><span data-offset-key="8jihb-4-0"> many crucial functions. It transports blood, nutrients, waste products, immune cells, and clotting cells. It is also </span><span class="adverb"><span data-offset-key="8jihb-5-0">closely</span></span><span data-offset-key="8jihb-6-0"> tied to the lymphatic system and our immune system. </span></div>
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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="8jihb-0-0"><span data-offset-key="8jihb-6-0">As you can see, no one part of our anatomy functions completely separate from the others. </span>All the parts of the structure must get along in order for the body to function.</div>
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General Interest

Serious and Not-So-Serious Causes of Goosebumps

9. Voluntary Goosebumps

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