NHA PHLEBOTOMY NATIONAL EXAM STUDY
GUIDE WITH FULL SOLUTIONS 2026
◉ Blood vessels. Answer: arteries, arterioles, capillaries, venules,
veins, superior & inferior vena cavae
◉ aorta, arteries, and arterioles carry_____ blood _______ the heart.
Answer: oxygenated & away from
◉ venules, veins, and superior and inferior vena cave carry _____
blood ________ the heart. Answer: deoxygenated & back to
◉ The average adult has ______ liters of blood. Answer: 5-6
◉ Plasma comprises how much of circulating blood?. Answer: 55%
◉ Plasma contains..... Answer: proteins, amino acids, gases,
electrolytes, sugars, hormones, minerals, vitamins, and water
◉ What percent of plasma is water?. Answer: 92%
,◉ Formed elements comprise what percent of circulating blood?.
Answer: 45%
◉ another name for red blood cells.... Answer: Erythrocytes
◉ What makes up the formed elements?. Answer: Red blood cells,
White blood cells, and platelets
◉ Another name for white blood cells.... Answer: leukocytes
◉ another name for platelets.... Answer: thrombocytes
◉ What comprises 99% of the formed elements?. Answer: red blood
cells (erythrocytes)
◉ Where do blood cells originate?. Answer: stem cells in bone
marrow
◉ How many RBCs are in a microliter of blood?. Answer: 4.2 to 6.2
million
◉ Normal life span of an RBS is.... Answer: 120 days
, ◉ Function of a leukocyte. Answer: provide the body protection
against infection
◉ Amount of WBCs per microliter of blood. Answer: 5,000-10,000
◉ leukocytosis. Answer: increase in WBCs
◉ leukocytosis is seen when?. Answer: cases of infection and
leukemia
◉ leukopenia. Answer: decrease in WBCs
◉ leukopenia is seen when?. Answer: viral infections or
chemotherapy
◉ Five types of WBCs. Answer: neutrophils, lymphocytes,
monocytes, eosinophils, basophils
◉ Average number of platelets per microliter of blood. Answer:
140,000-440,000
◉ Hemostasis. Answer: process by which blood vessels are repaired
after injury
GUIDE WITH FULL SOLUTIONS 2026
◉ Blood vessels. Answer: arteries, arterioles, capillaries, venules,
veins, superior & inferior vena cavae
◉ aorta, arteries, and arterioles carry_____ blood _______ the heart.
Answer: oxygenated & away from
◉ venules, veins, and superior and inferior vena cave carry _____
blood ________ the heart. Answer: deoxygenated & back to
◉ The average adult has ______ liters of blood. Answer: 5-6
◉ Plasma comprises how much of circulating blood?. Answer: 55%
◉ Plasma contains..... Answer: proteins, amino acids, gases,
electrolytes, sugars, hormones, minerals, vitamins, and water
◉ What percent of plasma is water?. Answer: 92%
,◉ Formed elements comprise what percent of circulating blood?.
Answer: 45%
◉ another name for red blood cells.... Answer: Erythrocytes
◉ What makes up the formed elements?. Answer: Red blood cells,
White blood cells, and platelets
◉ Another name for white blood cells.... Answer: leukocytes
◉ another name for platelets.... Answer: thrombocytes
◉ What comprises 99% of the formed elements?. Answer: red blood
cells (erythrocytes)
◉ Where do blood cells originate?. Answer: stem cells in bone
marrow
◉ How many RBCs are in a microliter of blood?. Answer: 4.2 to 6.2
million
◉ Normal life span of an RBS is.... Answer: 120 days
, ◉ Function of a leukocyte. Answer: provide the body protection
against infection
◉ Amount of WBCs per microliter of blood. Answer: 5,000-10,000
◉ leukocytosis. Answer: increase in WBCs
◉ leukocytosis is seen when?. Answer: cases of infection and
leukemia
◉ leukopenia. Answer: decrease in WBCs
◉ leukopenia is seen when?. Answer: viral infections or
chemotherapy
◉ Five types of WBCs. Answer: neutrophils, lymphocytes,
monocytes, eosinophils, basophils
◉ Average number of platelets per microliter of blood. Answer:
140,000-440,000
◉ Hemostasis. Answer: process by which blood vessels are repaired
after injury
