Question

Why is blood that flows from the lungs through the heart bright red rather than dark red?

Answer 1

Complete Question:

Why is blood that flows from the lungs to the heart bright red rather than dark red?

A) Oxygen makes it red.

B) Carbon dioxide makes it red.

C) Gastric juices produce the red colour of the blood.

D) The lungs add a pigment (dye) to blood as it flows through them.

Answer:

Option A) Oxygen makes it red.

Hemoglobin absorbs oxygen in the lungs, giving blood its vivid red colour. Hemoglobin transports oxygen to the various bodily areas as it circulates through the body.

Explanation:

• Haemoglobin, which has a strong affinity for oxygen, is present in the blood.
• The primary organ for distributing oxygen-rich blood throughout the body is the heart.
• Through the superior and inferior vena cava, it gets the deoxygenated (high in carbon dioxide) blood from every area of the body.
• Carboxy-hemoglobin is created when carbon dioxide and haemoglobin mix.
• Because there is carbon dioxide present, this blood is a dark red colour.
• The lungs receive the deoxygenated blood and oxygenate it.
• The pulmonary artery transports blood to the lungs where it is oxygenated.

After the blood has been oxygenated in the lungs, it is returned to the heart via the pulmonary vein. Due to the presence of oxy-hemoglobin, the pulmonary vein appears to be vivid red in colour.

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Answer 2

Answer:

Because oxygen makes the blood red.

Explanation:

The blood that flows from the lungs to the heart is known as arterial blood and it is bright red in colour because it contains oxygen. Whereas the blood that flows towards the lungs is known as venous blood and it is dark red in colour because it contains carbon dioxide. The red colour of blood usually comes from the red-coloured pigment which is present in blood and is called as haemoglobin. Hemoglobin binds with the oxygen and form oxyhaemoglobin. Presence of carbon dioxide in deoxygenated blood makes it darker in colour because of the difference in colour between deoxyhemoglobin and oxyhemoglobin.

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