Certified Phlebotomy Technician Exam Anatomy and Physiology 3

Question 1

When antecubital veins are inaccessible, which alternative venipuncture site is commonly used?

Accepted Answer

Dorsal hand veins

Answer

Femoral vein

Answer

Subclavian vein

Answer

Jugular vein

Question 2

In the cardiac cycle, what does the QRS complex on an ECG represent?

Accepted Answer

Ventricular depolarization

Answer

Atrial depolarization

Answer

Atrial repolarization

Answer

Sinoatrial node automaticity

Question 3

Which description best defines the function and structure of capillaries?

Accepted Answer

Microscopic, single-cell-thick vessels where gas and nutrient exchange occurs between blood and tissues

Answer

Thick-walled vessels that carry blood away from the heart under high pressure

Answer

Large valved vessels that return deoxygenated blood to the heart

Answer

Elastic vessels that absorb pressure changes generated by the heart

Question 4

What is the primary oxygen-carrying protein found within red blood cells?

Accepted Answer

Hemoglobin

Answer

Albumin

Answer

Fibrinogen

Answer

Globulin

Question 5

What is one primary function of the lymphatic vessels in relation to the circulatory system?

Accepted Answer

Returning excess interstitial fluid to the bloodstream

Answer

Pumping oxygenated blood to the lungs

Answer

Producing erythrocytes and platelets

Answer

Regulating arterial blood pressure directly

Question 6

Which cardiac valves prevent backflow of blood from the ventricles into the atria during ventricular contraction?

Accepted Answer

Atrioventricular (AV) valves

Answer

Semilunar valves

Answer

Pulmonary valves

Answer

Aortic valves

Question 7

What does the term 'hematocrit' refer to in a complete blood count?

Accepted Answer

The percentage of total blood volume occupied by red blood cells

Answer

The total number of white blood cells per unit volume of blood

Answer

The concentration of hemoglobin dissolved in plasma

Answer

The ratio of platelet count to plasma volume