Functional Anatomy - Circulatory System

Which organ system in humans is most directly involved in the transport of oxygen?

• digestive

• nervous

• excretory

• circulatory

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

A pulse can be detected most easily in

• an artery

• a vein

• a capillary

• a lacteal

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.

Dissolved nutrients, wastes, and oxygen are exchanged between the blood and intercellular fluid through the walls of

• arteries

• veins

• capillaries

• ventricles

Which body structures have walls one cell thick?

• veins and arteries

• trachea and bronchi

• capillaries and alveoli

• lymph vessels and stomach

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

• artery

• arteriole

• capillary

• vein

Bleeding from a small cut soon stops due to the release of enzymes from

• platelets

• activated antibodies

• hemoglobin

• white blood cells