8.1.2 Blood Vessels

• What are the three main types of blood vessels?

  Arteries, veins, capillaries
• Capillaries have extremely thin walls to allow diffusion.

  True
• The middle layer of arteries contains muscular and elastic fibers
• The inner layer of an artery is made of smooth endothelium
• Veins operate at lower blood pressure compared to arteries.

  True
• Veins maintain lower blood pressure due to their flexible walls.


  True
• Veins have valves to prevent blood from flowing backwards
• Match the artery layer with its description.

  Outer Layer ↔️ Tough, fibrous connective tissue

  Middle Layer ↔️ Thick layer of muscular and elastic fibers

  Inner Layer ↔️ Smooth lining (endothelium)
• Veins have thinner walls and lower blood pressure compared to arteries.


  True
• What type of gas exchange occurs in capillaries?

  Oxygen to tissues
• Arteries carry oxygenated blood away from the heart
• Match the blood vessel type with its function:

  Arteries ↔️ Carry oxygenated blood

  Veins ↔️ Carry deoxygenated blood

  Capillaries ↔️ Exchange gases and nutrients
• Arteries have valves to prevent backflow of blood.

  False
• Arrange the steps in the function of arteries:

  1️⃣ Carry oxygenated blood

  2️⃣ Deliver oxygen and nutrients

  3️⃣ Withstand high blood pressure
• Veins carry deoxygenated blood back to the heart
• What are the three main types of blood vessels?

  Arteries, veins, capillaries
• What is the primary function of capillaries?

  Gas exchange
• Why are arteries elastic?

  To withstand high pressure
• What is the function of the middle layer in veins?

  Provides elasticity
• Veins carry deoxygenated blood back to the heart.


  True
• Capillaries play a critical role in maintaining the health and function of body tissues
• What prevents the backflow of blood in veins?

  Valves
• Arrange the layers of an artery from outer to inner:

  1️⃣ Outer layer

  2️⃣ Middle layer

  3️⃣ Inner layer
• What is the function of the outer layer of an artery?

  Strength and support
• What is the key structural difference between veins and arteries?

  Veins have valves
• What are the flaps in veins called that prevent backflow?

  Valves
• Arteries carry deoxygenated blood away from the heart.

  False
• Arrange the layers of an artery from outermost to innermost.

  1️⃣ Outer Layer

  2️⃣ Middle Layer

  3️⃣ Inner Layer
• The inner layer of veins contains valves to prevent blood backflow
• Match the capillary feature with its function.

  Wall Thickness ↔️ Allows for efficient diffusion

  Cell Layer ↔️ Provides a minimal barrier

  Diameter ↔️ Enables red blood cells to pass through
• Arrange the blood vessels in order from highest to lowest blood pressure.

  1️⃣ Arteries

  2️⃣ Veins

  3️⃣ Capillaries