Question

A child studied the features of blood vessels in the human body and made a report on

it. Identify which of these observations is incorrect.

A rare question Answer needed​

Answer 1

Answer:

observation about blood flow is incorrect

Explanation:

because arteries carries pure blood from the heart towards the body organs

Answer 2

Answer:

Option B. is Incorrect

Explanation:

A. Arteries have thick walls while veins have thin walls. (Correct)

This is because,

1. Arteries have to carry /pump oxygenated blood from the heart to various parts of the body.
2. Blood emerges from the heart under high pressure.
3. More the area, less the pressure.
4. Therefore to withstand the pressure and avoid bursting , arteries have thick elastic walls which help in maintaining the blood pressure.
5. On the contrary, veins have thinner walls because they need to carry blood towards the heart where the blood is no longer under pressure.

C. Valves are absent in arteries while they are present in veins. (Correct)

This is because:

1. Veins have to carry blood towards the heart.
2. Thus, the blood must flow in one direction only (unidirectional).
3. To ensure the unidirectional flow of blood, and prevent the backflow of blood, veins have valves.
4. Valves in veins also prevent the mixing of oxygenated and deoxygenated blood.
5. On the contrary, arteries do not have valves because the blood travels under high pressure in arteries. This helps the flow of blood unidirectionally which thus, does not require valves.

D. Blood pressure is high in arteries while low in veins. (Correct)

This is because:

1. Arteries receive blood from the heart.
2. The blood is a pumping organ which pumps blood under high pressure.
3. Thus, blood pressure is high in arteries.
4. On the contrary, blood pressure is low in veins because veins carry blood towards the heart. While it collects deoxygenated blood from the organs, the blood pressure goes low. Also, the flow of blood is against gravity which reduces the blood pressure.

B. Arteries carry blood towards the heart from the body parts while veins carry blood away from the heart to the body parts. (Incorrect)

This is incorrect because:

1. Arteries receive blood from the heart and carry blood from the heart to the body parts.
2. Whereas, veins collect blood from the body organs and carry blood towards the heart.