Q: Which of the following equations correctly represents the calculation of hematocrit after centrifuging a blood sample?

$$\text{Hematocrit} = \frac{\text{Volume of erythrocytes}}{\text{Total blood volume}} \times 100$$

Question 1

A patient with sickle cell anemia experiences a crisis after a strenuous workout. Which of the following best explains why their erythrocytes are less effective at oxygen transport during this episode?

Accepted Answer

Their erythrocytes are abnormally shaped, which impairs their ability to pass through capillaries and deliver oxygen.

Question 2

Which of the following best describes the function of the buffy coat observed after whole blood centrifugation?

Accepted Answer

It consists of leukocytes and platelets, playing roles in immunity and hemostasis.

Question 3

A newborn develops hemolytic disease due to Rh incompatibility. Which maternal and fetal blood types are most likely involved in this scenario?

Accepted Answer

Mother is Rh-, fetus is Rh+

Question 4

A patient with type AB+ blood is considered a universal recipient. Which of the following best explains why?

Accepted Answer

They have both A and B antigens and no anti-A or anti-B antibodies in their plasma.

Question 5

Which of the following equations correctly represents the calculation of hematocrit after centrifuging a blood sample?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{Volume of erythrocytes}}{	ext{Total blood volume}} 	imes 100$$

Question 6

A patient receives a transfusion of type B blood but is type A. What is the most likely immediate consequence?

Accepted Answer

The patient's anti-B antibodies will cause agglutination of the transfused erythrocytes.

Question 7

Which of the following white blood cells is most likely to increase in number during a bacterial infection?

Accepted Answer

Neutrophils

Question 8

Which heart valve prevents backflow of blood from the right ventricle into the right atrium?

Accepted Answer

Tricuspid valve

Question 9

During ventricular contraction, which structure prevents the atrioventricular valves from inverting into the atria?

Accepted Answer

Chordae tendineae

Question 10

Which layer of the heart is responsible for the contractile force that pumps blood throughout the body?

Accepted Answer

Myocardium

Question 11

A blockage in the left anterior descending artery would most directly affect which region of the heart?

Accepted Answer

Interventricular septum and anterior walls of both ventricles

Question 12

Which of the following best describes the function of the coronary sinus?

Accepted Answer

It collects deoxygenated blood from the myocardium and drains into the right atrium.

Question 13

Which of the following correctly traces the path of blood flow through the heart, starting at the right atrium?

Accepted Answer

Right atrium → Tricuspid valve → Right ventricle → Pulmonary trunk → Pulmonary veins → Left atrium

Question 14

A patient with pericarditis is experiencing chest pain due to inflammation of which structure?

Accepted Answer

Pericardial sac and serous membranes

Question 15

Which of the following best explains why the left ventricle has a thicker myocardium than the right ventricle?

Accepted Answer

It pumps blood at a higher pressure to the entire body.

Question 16

Which of the following is the correct sequence of structures that an electrical impulse passes through in the cardiac conduction system?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 17

A patient is found to have a defect in the papillary muscles. Which of the following complications is most likely to occur as a result?

Accepted Answer

Backflow of blood from the ventricles into the atria during systole

Question 18

Which of the following best describes the function of intercalated discs in cardiac muscle tissue?

Accepted Answer

They allow rapid transmission of electrical impulses between cardiac cells.

Question 19

A patient with a mutation causing nonfunctional basophils would most likely have difficulty with which of the following?

Accepted Answer

Initiating inflammation and allergic responses

Blood and Cardiovascular System: Anatomy & Physiology Study Notes

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