HHB 2.5 Structure & Function of Arteries, Veins & Capillaries

What is the typical path of blood circulation from the heart?

• Heart -> Veins -> Capillaries -> Arteries
  

• Heart -> Arteries -> Capillaries -> Veins

• Heart -> Capillaries -> Veins -> Arteries

• Heart -> Arteries -> Veins -> Capillaries

What happens to blood pressure as it moves away from the heart?

• It increases steadily

• It remains constant

• It decreases

• It fluctuates unpredictably

What is the main function of capillaries in the circulatory system?

• Contraction and relaxation

• Vasoconstriction and vasodilation

• Exchange of substances with tissues

• Prevention of backflow of blood

What is the primary role of lymphatic vessels in the circulatory system?

• Exchange of materials between tissue fluid and cells

• Absorption of excess tissue fluid

• Contraction and relaxation

• Regulation of blood pressure

Which statement best describes the structure of arteries?

• They have a thick layer of smooth muscle and a thin layer of connective tissue.
  

• They have a thick layer of connective tissue and a thin layer of smooth muscle.
  

• They have an outer layer of connective tissue with elastic fibres and a middle layer of smooth muscle with elastic fibres.
  

• They have an outer layer of smooth muscle with elastic fibres and a thin layer of connective tissue.

What role do elastic fibres play in arteries?

• They prevent backflow of blood

• They allow for vasoconstriction and vasodilation

• They provide structural support and allow the arteries to stretch and recoil

• They facilitate the exchange of substances with tissues

What lines the central lumen of blood vessels?

• Endothelium

• Smooth muscle

• Connective tissue

• Elastic tissue

What is the name of the mechanism that controls blood flow by narrowing arteries?

(a)  

Which blood vessels have thin walls that allow for the exchange of substances with tissues?

• Arteries

• Veins

• Capillaries

• Lymphatic vessels

What process causes plasma to pass through capillary walls into the tissue fluid surrounding cells?

• Vasoconstriction

• Vasolidation

• Osmosis

• Pressure filtration