Q: A patient presents with pale skin, fatigue, and shortness of breath. Laboratory tests reveal decreased hemoglobin levels. Which of the following equations best represents the calculation of hematocrit, which may be used to further assess this patient?

$$\text{Hematocrit} = \frac{\text{Volume of RBCs}}{\text{Total Blood Volume}} \times 100$$

Question 1

Which of the following is NOT a main function of blood in the human body?

Accepted Answer

Production of hormones for endocrine signaling

Question 2

A patient presents with pale skin, fatigue, and shortness of breath. Laboratory tests reveal decreased hemoglobin levels. Which of the following equations best represents the calculation of hematocrit, which may be used to further assess this patient?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{Volume of RBCs}}{	ext{Total Blood Volume}} 	imes 100$$

Question 3

Which plasma protein is primarily responsible for maintaining osmotic pressure and keeping water in the blood vessels?

Accepted Answer

Albumin

Question 4

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

Accepted Answer

Type AB blood has no antibodies in plasma

Question 5

During hemostasis, which step involves the conversion of fibrinogen to fibrin, forming the mesh that stabilizes the blood clot?

Accepted Answer

Coagulation

Question 6

A patient with sickle cell anemia has abnormally shaped red blood cells. What is the primary consequence of this abnormal shape?

Accepted Answer

Difficulty passing through capillaries, leading to blockages

Question 7

Which of the following white blood cells is the first responder at the site of injury and is most involved in phagocytosis of bacteria?

Accepted Answer

Neutrophil

Question 8

A newborn develops hemolytic disease due to Rh incompatibility. Which scenario best describes how this occurs?

Accepted Answer

Mother is Rh negative, baby is Rh positive, and mother has been sensitized during a previous pregnancy

Question 9

Which of the following equations correctly represents cardiac output ($CO$)?

Accepted Answer

$$CO = SV 	imes HR$$

Question 10

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

Accepted Answer

Tricuspid valve

Question 11

A patient has a white blood cell count of 15,000/µL, which is higher than normal. What is the most likely diagnosis?

Accepted Answer

Leukocytosis

Question 12

Which of the following best describes the role of platelets in hemostasis?

Accepted Answer

They form a plug by adhering to exposed collagen at the site of vessel injury

Question 13

Which of the following is a correct sequence of events in the clotting cascade?

Accepted Answer

Formation of prothrombinase, conversion of prothrombin to thrombin, conversion of fibrinogen to fibrin

Question 14

Which of the following statements about the myocardium is correct?

Accepted Answer

It consists of cardiac muscle and makes up about 95% of the heart mass

Question 15

A patient with leukemia is likely to have which of the following laboratory findings?

Accepted Answer

Increased number of white blood cells

Question 16

Which of the following best describes the function of lymphocytes?

Accepted Answer

They produce antibodies and mediate immune responses

Question 17

Which of the following is true regarding the composition of plasma?

Accepted Answer

Water makes up approximately 90% of plasma volume

Question 18

Which of the following best explains why a person with type O blood is considered a universal donor?

Accepted Answer

Type O blood has no antigens on RBCs

Question 19

Which of the following equations correctly represents the calculation of stroke volume ($SV$)?

Accepted Answer

$$SV = EDV - ESV$$

Question 20

Which of the following best describes the role of erythropoietin in the body?

Accepted Answer

It stimulates the production of red blood cells in response to low oxygen levels

Blood and Cardiovascular System: Structure, Function, and Physiology

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