Body Systems

Base your answer to the following question on the diagram below, which represents the pathway of blood throughout the body, and on your knowledge of biology.

Which structure represents the chamber of the heart that receives oxygenated blood directly from the lungs?

• 5

• 6

• 3

• 4

Base your answer to questions #2 & #3 on the diagram below of the human heart and on your knowledge of biology.

Which sequence represents normal blood flow between the two sides of the heart?

• A -> F -> D -> C -> B

• B -> G -> H -> I -> C

• C -> D -> F -> A -> I

• D -> E -> I -> H -> G

A blockage in structure A would directly reduce blood flow to the

• heart

• lungs

• liver

• brain

Which statement most accurately describes the human heart?

• It has two atria and one ventricle, and it pumps blood directly into veins.

• It has one atrium and one ventricle, and it is composed of cardiac muscle.

• It has one atrium and two ventricles, and it is composed of visceral muscle.

• It has two atria and two ventricles, and it pumps blood directly into arteries.

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

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 tissues through the walls of

• arteries

• veins

• capillaries

• ventricles