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zlopas [31]
4 years ago
15

Veins have a much lower blood pressure than arteries. Which of these prevents backflow of blood in veins?

Biology
1 answer:
serious [3.7K]4 years ago
6 0
<span>Most veins are equipped with valves to prevent regurgitation (reverse blood flow). The return of blood to the heart is assisted by the action of the skeletal-muscle pump, and by the thoracic pump action of breathing during respiration.

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Answer:

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Explanation:

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During aerobic cellular respiration, what combines with hydrogen ions and the product is released as a by-product of respiration
Rufina [12.5K]
 The correct answer is C, Oxygen.
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Explanation; 
Cellular respiration allows organisms to release energy stored in chemical bonds of glucose, and other nutrients. The energy in glucose or other nutrients such as fats is used to produce ATP, which cells use to supply their energy needs. During aerobic respiration (in presence of oxygen), oxygen is reduced and water is produced together with carbon dioxide as by-products. 
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