Which of the following is the function of the cardiovascular system?

• A. regulating body temperature and fluid volume
• B. preventing infection
• C. transporting hormones and wastes
• D. All options are functions of the cardiovascular system

All of the following are formed elements of the blood except:

• A. plasma
• B. erythrocytes
• C. thrombocytes
• D. leukocytes

Which of the following components of blood makes up the smallest percentage by volume?

• A. plasma
• B. erythrocytes
• C. thrombocytes & leukocytes

An erythrocyte is more commonly known as

• A. a white blood cell
• B. a red blood cell
• C. a platelet
• D. hemoglobin

Blood plasma is mostly made of

• A. water
• B. granules
• C. oxygen
• D. hemoglobin

The cell shown is responsible for releasing histamines, which dilate blood vessels during an allergic attack. It is categorized asa a(n) ____ and is called a(n) ____.

• A. granulocyte, lymphocyte
• B. agranulocyte, monocyte
• C. granulocyte, basophil
• D. agranulocyte, eosinophil

A single hemoglobin molecule can carry ____ oxygen molecules.

• A. 1
• B. 2
• C. 3
• D. 4

Because oxygen is nonpolar,

• A. it must be absorbed by the lymphocytes
• B. it must diffuse directly into the blood
• C. it must be eliminated quickly
• d. it must be carried by hemoglobin

The process of hemostasis is completed by which type of cells?

• A. white blood cells
• B. red blood cells
• C. platelets
• D. plasmas

Where does hematopoiesis occur?

• A. it occurs in the red bone marrow of adults
• B. it occurs in the heart
• C. it occurs in the blood vessels
• D. it occurs in the lungs