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sergey [27]
3 years ago
5

Why do veins have valves

Biology
1 answer:
Dimas [21]3 years ago
4 0
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.) Valves also help blood travel back to the heart against the force of gravity.
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A steady activity in which your heart supplies oxygen to help fuel your muscles is
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Answer:

Aerobic activity

Explanation:

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Aerobic activity is an activity which increases the amount of blood that goes to the muscles. Oxygen is needed for the proper functioning of the muscles.

When carrying out any type of physical activity such as weight lifting the muscles need a large amount of oxygen to function well. The oxygen in the body is used to break down glucose and create the fuel which is needed by the muscles in the form of ATP. Different aerobic activities carried out also helps to strenthen the lungs.

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3 years ago
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Both erosion and lack of rock deposition
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<em>Answer:</em>

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<em>Explanation:</em>

<em>hope this helps!:D</em>

<em />

8 0
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What is a "True Mineral"?
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What processes occur during G2 phase? Choose all which apply.
Inessa [10]

Explanation:

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