Blood and Its Functions Quiz

Where are white blood cells (WBCs) and platelets found in a centrifuge tube?

• Top

• Middle

• Bottom

• Side

Which of the following is not a formed element of blood?

• Red blood cells

• White blood cells

• Platelets

• Plasma

What is the main site of hematopoiesis in adults?

• Liver

• Spleen

• Red bone marrow

• Thymus

What is the thickness of a red blood cell?

• 1.0 micrometer

• 2.0 micrometers

• 3.0 micrometers

• 4.0 micrometers

What is the nucleus structure of neutrophils?

• Bilobed nucleus

• Single, round nucleus

• Lobed nucleus; 2 to 5 sections

• No nucleus

What percentage of leukocytes do basophils make up?

• 10%

• 5%

• Less than 1%

• 20%

What is the primary function of heparin released by basophils?

• Stimulate inflammation

• Stop blood from clotting

• Destroy bacteria

• Increase blood pressure

What substance do platelets release to cause contraction of blood vessels?

• Dopamine

• Serotonin

• Adrenaline

• Histamine

What is a potential cause of thrombocytopenia?

• High iron levels

• Cancer treatments

• Excessive exercise

• High protein diet

What is the role of serotonin released by platelets?

• Dilate blood vessels

• Contract smooth muscles

• Increase heart rate

• Lower blood pressure