NPA Anatomy & Physiology of the Circulatory System 2

Question 1

Which vein runs along the lateral (thumb) side of the forearm and is considered the third choice for venipuncture in the antecubital fossa?

Accepted Answer

Cephalic vein

Answer

The cephalic vein runs along the lateral (radial/thumb) side of the forearm and is generally the third choice for venipuncture due to its tendency to roll.

Question 2

Approximately how much blood does the average adult human body contain?

Accepted Answer

4–6 liters

Answer

The average adult body contains approximately 4–6 liters of blood, representing about 7–8% of total body weight.

Question 3

What is the primary role of erythrocytes (red blood cells)?

Accepted Answer

Transport oxygen and carbon dioxide

Answer

Erythrocytes contain hemoglobin, which binds oxygen for transport to tissues and carries carbon dioxide back to the lungs.

Question 4

Which vein runs along the medial (pinky finger) side of the forearm and is considered the second choice for antecubital venipuncture?

Accepted Answer

Basilic vein

Answer

The basilic vein runs along the medial (ulnar) side of the forearm and is the second choice, though it is close to the brachial artery and median nerve.

Question 5

What is plasma?

Accepted Answer

The liquid portion of blood containing clotting factors and proteins

Answer

Plasma is the liquid portion of whole blood that contains water, proteins (including clotting factors), hormones, and electrolytes.

NPA - National Phlebotomy Association Certification Practice Test

NPA - National Phlebotomy Association Certification Practice Test

NPA Anatomy & Physiology of the Circulatory System 2