Circulatory System - Revision

The flow of blood to and from the lungs is referred to as

• pulmonary circulation

• systemic circulation

• autonomic circulation

• somatic circulation

The concentration of oxygen is highest in the blood flowing through the

• superior vena cava

• inferior vena cava

• pulmonary vein

• pulmonary artery

The movement of blood from the legs toward the heart is hindered by gravity. The effect of gravity is counteracted by

• smooth muscle in the capillaries

• cilia lining the blood vessels

• valves in the veins

• lymph nodes near major vessels

Which statement best describes arteries?

• They have thick walls and transport blood away from the heart.

• They have thick walls and transport blood toward the heart.

• They have thin walls and transport blood away from the heart.

• They have thin walls and transport blood toward the heart.

Which type of vessel normally contains valves that prevent the backward flow of materials?

• artery

• arteriole

• capillary

• vein

An infection in the body might result in a sudden

• decrese in the activity of antigens produced by the mitochondria

• decrese in the amount of DNA present in the nuclei of cells

• increase in the activity of white blood cells

• increase in the number of red blood cells

The circulatory system works with the ___________ system to provide our body with oxygen.

• respiratory
• digestive
• muscular
• skeletal

Thin-walled vessels that allow for the exchange of O_{2 ,} CO₂, nutrients and wastes between blood cells or air sacs in the lungs

• Arteries
• Veins
• Capillaries

What does Deoxygenated mean?

• Oxygen-rich
• Blood flow
• Oxygen-poor
• Water Flow

Carry blood away from heart; mostly oxygen-rich

• Arteries
• Veins
• Capillaries