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Circulation Around the Body | Biology for GCSE/IGCSE - Year 11 PDF Download

Main Blood Vessels in the Body

  • Arteries transport blood away from the heart and towards various organs.
  • Arteries gradually decrease in diameter, progressing to arterioles and eventually to capillaries as they traverse through the organ.
  • Capillaries, where nutrient exchange occurs, expand into venules and ultimately veins as they depart from the organs.
  • Veins are responsible for conveying blood back to the heart for recirculation.

The circulatory systemThe circulatory system

Important Blood Vessels Table

Circulation Around the Body | Biology for GCSE/IGCSE - Year 11

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Which blood vessels are responsible for transporting blood away from the heart and towards various organs?
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1. What are the main blood vessels in the body?
Ans. The main blood vessels in the body include arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart, veins carry deoxygenated blood back to the heart, and capillaries are tiny blood vessels where gas exchange occurs.
2. What is the purpose of circulation around the body?
Ans. Circulation around the body is essential for transporting oxygen, nutrients, and waste products to and from cells. It helps maintain homeostasis by regulating body temperature, pH levels, and the distribution of hormones.
3. How do arteries, veins, and capillaries differ in structure and function?
Ans. Arteries have thick, muscular walls to withstand high pressure and carry blood away from the heart. Veins have thin walls and valves to prevent backflow and carry blood back to the heart. Capillaries are very small and allow for the exchange of gases, nutrients, and waste products between blood and tissues.
4. What is the role of the heart in circulation around the body?
Ans. The heart is a muscular organ that pumps blood throughout the body. It consists of four chambers: two atria and two ventricles. The atria receive blood, while the ventricles pump blood out to the lungs and body. This continuous pumping action maintains circulation.
5. How does the circulatory system work with other body systems to maintain overall health?
Ans. The circulatory system works closely with the respiratory system to exchange oxygen and carbon dioxide, the digestive system to absorb nutrients, and the excretory system to remove waste products. It also plays a role in immune responses by transporting white blood cells and antibodies. All these interactions help maintain overall health and function of the body.
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