Phlebotomy Test Phlebotomy Anatomy and Physiology 1 — Questions and Answers
Question 1: Which vein is most commonly used for venipuncture in the antecubital fossa?
- Cephalic vein
- Median cubital vein (Correct answer)
- Basilic vein
- Radial vein
Correct answer: Median cubital vein
The median cubital vein is the preferred site for venipuncture because it is large, well-anchored, and least painful.
Question 2: What is the liquid portion of blood that remains after clotting has occurred?
- Plasma
- Serum (Correct answer)
- Buffy coat
- Fibrinogen
Correct answer: Serum
Serum is the liquid portion of blood that remains after the clot has formed and been removed, whereas plasma still contains clotting factors.
Question 3: Which type of blood vessel carries oxygenated blood away from the heart?
- Veins
- Capillaries
- Arteries (Correct answer)
- Venules
Correct answer: Arteries
Arteries carry oxygenated blood away from the heart to the body's tissues, with the exception of the pulmonary artery.
Question 4: What is the approximate percentage of the adult body's blood volume made up by red blood cells?
- 20–25%
- 30–35%
- 40–45% (Correct answer)
- 55–60%
Correct answer: 40–45%
Red blood cells (erythrocytes) constitute approximately 40–45% of total blood volume, a measurement known as the hematocrit.
Question 5: Which cellular component of blood is primarily responsible for oxygen transport?
- Platelets
- Leukocytes
- Erythrocytes (Correct answer)
- Monocytes
Correct answer: Erythrocytes
Erythrocytes (red blood cells) contain hemoglobin, which binds and transports oxygen from the lungs to tissues throughout the body.
Question 6: The antecubital fossa is located at which anatomical position?
- Back of the knee
- Inner aspect of the elbow (Correct answer)
- Front of the wrist
- Inner aspect of the ankle
Correct answer: Inner aspect of the elbow
The antecubital fossa is the triangular area on the anterior (inner) surface of the elbow and is the primary site for routine venipuncture.
Phlebotomy Test Phlebotomy Anatomy and Physiology 1
Which vein is most commonly used for venipuncture in the antecubital fossa?