Explain the differences.
a. Arteries and veins.
b. External and internal respiration

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Solution

a.

External respiration
Internal respiration

1. It occurs between the body and external environment. It occurs at the cellular level.

2. It is a mechanical process. It is a chemical process.

3. It can be both- voluntary and involuntary action. It is only an involuntary action.

b.

Arteries
Veins

1. Carries blood towards organs and away from heart. Carries blood towards heart and away from organs.

2. Carries fully oxygenated blood Carries deoxygenated and CO₂ enriched blood.

3. Blood flows with high pressure and jerks,. Blood flows with low pressure and smoothly.

4. Have no valves Have valves to prevent backflow of blood.

5. Walls are elastic. Walls are non-elastic.

6. Are Deeply placed. Are superficial.

7 Branched and decreases in size. Unites and increases in size

8. Can constrict and dilate Cannot constrict.

9. Have thick and muscular walls Have thin and less muscular walls.

10. Smallest artery is called arteriole Smallest vein is called Venules.

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