3.2.2 Blood vessels

• What is the primary function of arteries?

  Carry blood away from the heart
• Why do capillaries have very thin walls?

  To maximize diffusion efficiency
• Veins carry blood under high pressure.

  False
• Match the blood vessel type with its key feature:

  Arteries ↔️ Thick elastic walls

  Veins ↔️ Contain valves

  Capillaries ↔️ Single-cell layer
• Valves in veins prevent the backflow of blood
• What is the primary role of capillaries in the circulatory system?

  Facilitate gas exchange
• Arteries carry blood under low pressure.

  False
• Blood vessels are responsible for transporting blood throughout the body
• Valves in veins prevent the backflow of blood.


  True
• Arteries have thick elastic walls to regulate blood pressure
• What connects arteries and veins in the circulatory system?

  Capillaries
• What allows arteries to regulate blood pressure?

  Elasticity
• Capillaries have valves to regulate blood flow.

  False
• Arteries regulate blood pressure through their elasticity and smooth muscle
• What type of wall structure do arteries have?

  Thick, elastic walls with smooth muscle
• Capillaries carry blood under high pressure.

  False
• What are the three main types of blood vessels?

  Arteries, veins, capillaries
• Veins carry blood back to the heart under low pressure.
• Arteries have thick, elastic walls with smooth muscle.


  True
• Arteries carry blood away from the heart under high pressure.


  True
• What does smooth muscle in arteries allow them to do?

  Regulate blood pressure
• What type of blood vessel carries blood back to the heart?

  Veins
• Valves in veins ensure unidirectional blood flow towards the heart.
• The thin walls of capillaries maximize diffusion efficiency.

  True
• Arrange the following steps to describe blood flow through capillaries:

  1️⃣ Blood enters capillaries

  2️⃣ Gases and nutrients exchange

  3️⃣ Blood flows into veins
• Veins carry blood back to the heart under low pressure.
• What is the primary function of capillaries in the circulatory system?

  Exchange gases and nutrients
• The elasticity of arteries allows for blood pressure regulation.

  True
• What feature of capillaries maximizes diffusion efficiency?

  Single-cell layer walls
• Veins return blood to the heart under low pressure
• What is the primary function of veins in the circulatory system?

  Return blood to the heart
• Arteries carry blood away from the heart under high pressure.

  True
• What is the function of capillaries?

  Exchange gases and nutrients
• Veins contain valves to prevent backflow of blood.
• Why do capillaries have thin walls?

  To maximize diffusion efficiency
• The thick, elastic walls of arteries help withstand high pressure.
• Arrange the following steps to describe blood flow regulation in arteries:

  1️⃣ Smooth muscle contracts

  2️⃣ Blood vessel constricts

  3️⃣ Blood flow decreases
• Veins have thinner walls compared to arteries because they withstand less pressure.


  True
• What is the primary function of capillaries?

  Facilitate gas exchange
• Capillaries are located between arteries and veins.