Where does this come from, and can I check it?

Reduced skin blood flow keeps warm blood in the core at the cost of cold extremities. The figure is taken from WHO, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a human body fact?

Yes. It sits on the Human Body shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Cold narrows the vessels in fingers and toes

Reduced skin blood flow keeps warm blood in the core at the cost of cold extremities In the cold, sympathetic nerves constrict small arteries and arteriovenous connections in the skin. Flow to hands and feet drops sharply so heat stays in the trunk and brain. Fingers can cool far below core temperature, which is why they feel numb long before the body is in trouble. It sits in Mondo's human body collection, one of 200 facts that each trace back to the reference below.

Where this comes from

WHO

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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The body produces millions of red blood cells every secondRed blood cells circulate for about 120 days before being recycled The human heart beats over one hundred thousand times dailyPumping continuously the heart propels thousands of litres of blood every day An average adult body contains about five litres of bloodBlood accounts for roughly seven to eight percent of total adult body weight Capillary walls are only one single cell layer thickThin vascular walls enable rapid diffusion of oxygen and metabolic nutrients Valves and calf muscles push blood uphillOne-way valves in leg veins stop blood falling back toward the feet The heart feeds itself through coronary arteriesCardiac muscle takes its blood from branches that leave the aorta just above the valve

Tags: cold, circulation, skin

Cold narrows the vessels in fingers and toes: the short answers

Where does this come from, and can I check it?: Reduced skin blood flow keeps warm blood in the core at the cost of cold extremities. The figure is taken from WHO, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.