OCR A level PE - CV System Quiz

Which blood vessel type is directly involved in nutrient and gas exchange?

• Arteries

• Veins

• Capillaries

• Arterioles

Which blood vessels carry blood back to the heart?

• Arteries

• Veins

• Capillaries

• Lymphatic vessels

What is the characteristic of the lumen in arteries?

• Narrow central lumen

• Large central lumen

• Thick-walled lumen

• Flexible lumen

Which blood vessel has a thick inner layer of muscle and elastic fibers?

• Capillaries

• Veins

• Arteries

• Lymph vessels

What is the primary function of the large layer of smooth muscle in arterioles?

• To store blood

• To allow vessels to vasodilate and vasoconstrict

• To produce red blood cells

• To filter blood

What do pre-capillary sphincters do in the circulatory system?

• They pump blood

• They surround the entry of a capillary bed

• They produce white blood cells

• They store oxygen

What happens when arterioles vasoconstrict?

• Blood flow increases

• Blood flow decreases

• Blood pressure drops

• Blood becomes oxygenated

Which process is directly affected by the smooth muscle in arterioles?

• Digestion

• Respiration

• Blood flow regulation

• Nerve signal transmission

Which of the following is NOT a function of venules?

• Vasodilation

• Vasoconstriction

• Pumping blood

• Maintaining slow blood flow

What happens to the venous valves during muscle contraction?

• They open

• They close

• They disappear

• They become rigid