HUMAN PHYSIOLOGY
CONTROL AND COORDINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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yes
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no
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maybe
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None of the above
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Detailed explanation-1: -These blood vessels carry blood to every part of your body: Arteries carry oxygenated blood away from the heart; veins carry blood back to the heart and capillaries connect them together. If you were to lay out the vast network of blood vessels from an average child end to end, they would stretch for over 60, 000 miles!
Detailed explanation-2: -The total length of capillaries in the human brain is 400 miles [11]. It is the primary site of oxygen and nutrient exchange, which in turn is dependent on the path length and transit time of red blood cells.
Detailed explanation-3: -If you laid out all the blood vessels in an adult’s body end to end, it would circle Earth’s equator four times-that’s almost 100, 000 miles!
Detailed explanation-4: -Blood is supplied to the entire brain by 2 pairs of arteries: the internal carotid arteries and vertebral arteries. As you can see in the figure below, the right and left vertebral arteries come together at the base of the brain to form a single basilar artery.
Detailed explanation-5: -What’s more, the capillaries, which are the smallest of the blood vessels, would make up about 80 percent of this length. By comparison, the circumference of the Earth is about 25, 000 miles (40, 000 km). That means a person’s blood vessels could wrap around the planet approximately 2.5 times!