Q16

Circulatory System Overview

Blood Vessel Types

• Definition of Blood Vessels: Blood vessels are the conduits through which blood flows within the circulatory system.

Arteries

• Function: Carry blood away from the heart.

Veins

• Function: Carry blood back to the heart.

Capillaries

• Function: Site of exchange between blood and tissues (nutrients, gases, waste).

Smaller Vessels Connecting Arteries to Capillaries

• Definition: The smaller vessels that connect arteries to capillaries are known as arterioles.
  • Significance:
  • Arterioles regulate blood flow and pressure through vasoconstriction and vasodilation.

Important Blood Vessel Terms

• Vena Cavae: Large veins that carry deoxygenated blood back to the heart (not involved in carrying blood away from the heart).
• Venules: Small veins that collect blood from capillaries and transport it back to the veins.
• Capillary Arteries: An inaccurate term; the process involves arterioles leading to capillaries.

Multiple Choice Question on Blood Vessels

• Question: The smaller vessels that carry blood away from the heart and connect the arteries to the capillaries are called the:
  • a. vena cavae.
  • b. venules.
  • c. capillary arteries.
  • d. arterioles.
• Correct Answer: d. arterioles