Question

explain the differences

1) Arteries and veins
2) external and internal respiration

I DON'T WANT USELESS ANSWERS ​

Answer 1

Explanation:

1)Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart of the body.Veins are the blood vessels that carry blood low in oxygen from the body pack to the heart for reoxygenation.

2)External respiration occurs in lungs where oxygen diffuses into the blood and carbon dioxide refuses into the alveolar air. Internal respiration occurs in the metabolizing tissues,where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.

Answer 2

Explanation:

ARTERIES:

• Involved in carrying pure, oxygenated blood and nutrient-rich blood.
• Consists of three distinct layers, which are rigid, thicker and highly muscular.
• Located deep within the body.
• Red in colour.
• Carry blood away from the heart to various parts of the body.
• High pressure, as the blood flows by the pumping pressure of the heart.
• Comparatively higher oxygen level.
• The level of carbon dioxide is low.
• In downward direction from the heart to the body tissues.
• Lumina is narrow.
• Valves are absent
• Arteries are at a greater risk of certain diseases like angina pectoris, atherosclerosis, etc.

VEINS:

• Involved in carrying impure, deoxygenated blood.
• Consists of three distinct layers, which are thin and collapsible.
• Blue in colour
• Carry blood towards the heart from the various parts of the body
• Low pressure, as the blood flows by the capillary action of the veins.
• Comparatively low oxygen level.
• The level of carbon dioxide is high
• In upward direction from the body tissues to the heart.
• Lumina is wide.
• Valves are present
• Veins are less susceptible to diseases such as varicose veins.

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