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NEET PG The Cardiovascular System: Blood — practice questions — page 3

Explore 138 free The Cardiovascular System: Blood questions in NEET PG Physiology. Open each question or exercise to read its content, reference answers and available explanation.

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The Cardiovascular System: Blood questions and exercises with answers

Showing questions 61–90 of 138.

Which anemia is defined by deficient numbers of red blood cell stem cells?Read the answer and worked solution →What is the most severe form of thalassemia called?Read the answer and worked solution →What is the primary drawback of polycythemia?Read the answer and worked solution →Why does a dehydrated patient show a transiently raised hematocrit?Read the answer and worked solution →How many leukocytes are normally present per microliter of blood?Read the answer and worked solution →Which formed elements are complete cells with a nucleus and organelles?Read the answer and worked solution →What is the process by which leukocytes squeeze between adjacent cells of a vessel wall?Read the answer and worked solution →Injured cells and nearby leukocytes emit chemical signals that draw more leukocytes in. What is this called?Read the answer and worked solution →Neutrophils normally comprise what percentage of the total leukocyte count?Read the answer and worked solution →Which term describes younger, immature neutrophils that are only beginning to develop lobes?Read the answer and worked solution →Which set of substances is found in neutrophil granules?Read the answer and worked solution →Why does a severe burn injury raise the neutrophil count?Read the answer and worked solution →Which leukocyte releases antihistamine molecules and is especially active against parasitic worms?Read the answer and worked solution →Eosinophils typically represent what percentage of the total leukocyte count?Read the answer and worked solution →Which pair of substances do basophil granules release?Read the answer and worked solution →High basophil counts are associated with allergies, parasitic infections, and which endocrine state?Read the answer and worked solution →About what proportion of all leukocytes are lymphocytes?Read the answer and worked solution →Among lymphocytes, which cells are typically the larger ones?Read the answer and worked solution →What do natural killer cells recognize?Read the answer and worked solution →What are monocytes called after they leave the circulation?Read the answer and worked solution →Monocytes normally represent what share of the total leukocyte count?Read the answer and worked solution →How does acute leukemia differ from chronic leukemia in the cells that accumulate?Read the answer and worked solution →Which condition is defined by too few leukocytes being produced?Read the answer and worked solution →A platelet is a fragment of the cytoplasm of which cell?Read the answer and worked solution →How many platelets does each megakaryocyte release during its lifespan?Read the answer and worked solution →What happens to about one-third of platelets after they enter the circulation?Read the answer and worked solution →How long do platelets remain in the circulation?Read the answer and worked solution →Too many platelets in the circulation is called what?Read the answer and worked solution →What is the first step in hemostasis?Read the answer and worked solution →Which chemicals are believed to trigger vascular spasm after vessel injury?Read the answer and worked solution →

Worked practice questions

Which anemia is defined by deficient numbers of red blood cell stem cells?

  1. Megaloblastic anemia
  2. Pernicious anemia
  3. Aplastic anemia
  4. Sickle cell anemia
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Correct answer: C. Aplastic anemia

1. Aplastic anemia is the condition in which there are deficient numbers of red cell stem cells. 2. It is often inherited, or it may be triggered by radiation, medication, chemotherapy or infection. 3. Because the defect is upstream at the stem cell, no amount of dietary iron or vitamin repair will correct it. 4. Megaloblastic and pernicious anemias are vitamin problems and sickle cell anemia is a hemoglobin gene problem, so none of them is a stem cell shortage. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_

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What is the most severe form of thalassemia called?

  1. Hemoglobin S disease
  2. Pernicious anemia
  3. Polycythemia vera
  4. Cooley's anemia
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Correct answer: D. Cooley's anemia

1. Thalassemia is an inherited condition in which maturation of the red cells does not proceed normally. 2. It occurs typically in people from the Middle East, the Mediterranean, Africa and Southeast Asia. 3. Its most severe form is called Cooley's anemia. 4. Hemoglobin S disease points to sickle cell disease, a different inherited hemoglobin disorder. 5. Polycythemia vera is an excess of immature erythrocytes, the opposite direction of abnormality. 6. Pernicious anemia is an absorption disorder of vitamin B12 and is unrelated to globin maturation. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_

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What is the primary drawback of polycythemia?

  1. Increased viscosity strains the heart
  2. Reduced oxygen binding by hemoglobin
  3. Loss of iron stores from the liver
  4. Falling plasma protein concentration
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Correct answer: A. Increased viscosity strains the heart

1. Polycythemia is an overproduction of red cells, detected as an elevated hematocrit. 2. More cells do not mean poorer oxygen delivery, so the problem is not a delivery failure. 3. The problem is the increased viscosity of the blood, which makes it harder for the heart to circulate. 4. This is why polycythemia vera raises blood pressure and why blood doping to a hematocrit of 70 or greater has proved fatal. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_

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