veins allow blood to flow only towards the -------------------
Answers
Answer:
Veins carry the blood back to the heart. They're similar to arteries but not as strong or as thick. Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)
Explanation:
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Answer:
Veins allow blood to flow only towards the heart.
Explanation:
In the majority of animals, the heart is a muscle. This organ circulates blood through the circulatory system's blood arteries. While transporting metabolic waste products like carbon dioxide to the lungs, the blood being pumped transports oxygen and nutrients to the body. Humans have a heart that is around the size of a closed fist and is situated in the centre of the chest, between the lungs.
The human heart has four chambers: the upper left and right atria, bottom left and right ventricles, as well as other animals and birds.
In most cases, the right atrium and ventricle are referred to as the right heart, and its left counterparts are referred to as the left heart.
The majority of reptiles have three chambers, in contrast to fish, which have an atrium and a ventricle.
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