CV system QUIZ

How many chambers are there in the heart?

• 1

• 2

• 3

• 4

Which valve controls blood entering the right ventricle from the right atrium?

• tricuspid valve

• bicuspid valve

• unicuspid valve

• mitral valve

Which blood cells are responsible for resisting infections.

• Red blood cells

• White blood cells

• Platelets

• Plasma

Which cells make up 99% of the cells in the blood?

• Plasma cells

• White blood cells

• Red blood cells

• Platelets

Which blood vessels carry oxygenated blood?

• Veins

• Capillaries

• Venules

• Arteries

Which feature of capillaries allows for gas exchange to occur?

• Elastic walls

• Valves

• Semi-permeable membrane

• Red cells

Venous return is the return of blood back to the heart through veins. Which of these factors assists venous return?

• Dilation of the vein

• Dilation of the artery

• High pressure from left ventricle beating

• Contraction of muscles

What is the primary reason that HR increases during exercise?

• Delivery of more O2 to the muscles through the arteries

• Delivery of more O2 through the veins

• The heart needs to get more blood to the organs

• The arteries need to remove more wastes from the muscle cells

Blood flow around the body redistributes as a response to exercise. What approximate % of blood flow might be directed toward the working muscles at maximal exercise intensity?

• 55%

• 65%

• 75%

• 85%

Describe the relationship of stroke volume to exercise intensity

• Linear relationship

• Initial increase, then it remains constant

• Direct relationship

• Initial increase, then it decreases