NCLEX : Circulatory and Respiratory Systems

Study concepts, example questions & explanations for NCLEX

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Example Questions

Example Question #61 : Circulatory And Respiratory Systems

What is the average amount of blood in the adult body?

Possible Answers:

Correct answer:

Explanation:

The average adult body contains 4.5-6 liters of blood, depending on size and gender. Blood volume (BV) can be calculated by the following formula, given the hematocrit (HC) and plasma volume (PV):

Example Question #62 : Circulatory And Respiratory Systems

The most common free plasma proteins include all of the following except __________.

Possible Answers:

globulin

major histocompatibility complex (MHC)

albumin

fibrinogen

Correct answer:

major histocompatibility complex (MHC)

Explanation:

The three main types of proteins in the blood are albumin, globulin, and fibrinogen. Major histocompatibility complex is not a free plasma protein, but rather a class of proteins found on the surface of all nucleated cells (MHC class I) and on the surface of certain immune cells known as antigen-presenting cells (MHC class II). They play an important part in immune function by displaying foreign antigens for communication between leukocytes.

Example Question #657 : Nclex

Lymphocytes (natural killer cells, T helper cells, and B cells) make up what percentage of white blood cells?

Possible Answers:

26-33%

1-3%

55-70%

5-15%

Correct answer:

26-33%

Explanation:

Lymphocytes are the second most common class of white blood cells, making up 26-33% of white blood cells. 

Example Question #355 : General Biology

Which of the following blood cells is anucleate (lacking a nucleus)?

Possible Answers:

Dendritic cells

Natural killer cells

Erythrocytes

Megakaryocytes

Correct answer:

Erythrocytes

Explanation:

The only anucleate blood cells are erythrocytes, or red blood cells. These cells are created with nuclei, but each daughter cell will then lose its nucleus in order to create more suface area for hemoglobin to bind oxygen and for easier passage through narrow capillaries. 

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