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Blood Circulation

Description: Heart and Blood Circulation Transportation in Animals
Number of Questions: 15
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Tags: Heart and Blood Circulation Transportation in Animals
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Which of the following is the most muscular chamber of the human heart?

  1. Left atrium

  2. Right ventricle

  3. Right atrium

  4. Left ventricle

  5. All are equally muscular

Show answer
Correct Option: D
Explanation:

Left ventricle is the most muscular chamber because it pumps out blood to the entire body tissues, through the aorta.

The membranous outer covering of the heart is known as

  1. meninx

  2. peritoneum

  3. myocardium

  4. pericardium

  5. endocardium

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Correct Option: D
Explanation:

The outer membranous covering of the heart is known as pericardium.

Which of the following are serum proteins?

  1. Albumin and globulins

  2. Albumins only

  3. Globulin and fibrinogen

  4. Albumin, globulin and fibrogen

  5. Globulin only

Show answer
Correct Option: D
Explanation:

Albumin, globulin and fibrogen are serum proteins. They are also known as blood plasma proteins.

Which of the following is an incorrect statement?

  1. Mature mammalian erythrocytes are enucleated.

  2. Formation of RBC's is known as Erythropoiesis.

  3. A hormone called Erythropoietin regulates the production of RBC's.

  4. RBC's arise from haemocytoblasts in the stem cells of bone marrow.

  5. The lifetime of RBC's is about 120 days.

Show answer
Correct Option: C
Explanation:

The hormone Erythropoietin regulates the production of RBC's.

The mitral valve is present

  1. between the right auricle and right ventricle

  2. between the inferior vena cava and right auricle

  3. between the left auricle and left ventricle

  4. between the left auricle and right auricle

  5. between the aorta and left ventricle

Show answer
Correct Option: C
Explanation:

Mitral valve also known as a bicuspid valve is present between the left auricle and left ventricle.

The percentage of erythrocytes in total blood volume is called ______.

  1. hematocrit

  2. hematoma

  3. haemocrit

  4. haemocoel

  5. hemophilia

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Correct Option: A
Explanation:

Hematocrit is the volume percentage (%) of red blood cells in blood. It is normally about 45% for men and 40% for women.

Which cation is required in blood coagulation for the conversion of prothrombin into active thrombin?

  1. Ca2+

  2. Mg2+

  3. Fe2+

  4. Mn2+

  5. Zn2+

Show answer
Correct Option: A
Explanation:

Calcium ions are required in blood coagulation for the conversion of prothrombin into active thrombin.

Anemia is not caused by

  1. blood loss from the body

  2. inadequate secretion of erythropoietin

  3. polycythemia

  4. excessive destruction of erythrocytes

  5. bone marrow failure

Show answer
Correct Option: C
Explanation:

This is an opposite to anemia. Polycythemia is a bone marrow disease that leads to an abnormal increase in the number of blood cells, primarily red blood cells.

The pulmonary trunk originates from ___________.

  1. right auricle

  2. left auricle

  3. right ventricle

  4. left venrticle

  5. the lungs

Show answer
Correct Option: C
Explanation:

The pulmonary trunk is a major vessel of the human heart which originates at the right ventricle. It branches into the right and left pulmonary arteries, which carries deoxygenated blood to the lungs.

Which of the following statements is incorrect?

  1. Erythrocytes are destroyed in the spleen and liver.

  2. Folic acid and vitamin B12 are essential for erythrocyte formation.

  3. Granulocytes and agranulocytes are both types of thrombocytes.

  4. Thrombocytes are essential for blood coagulation.

  5. Erythrocytes are formed in the bone marrow.

Show answer
Correct Option: C
Explanation:

Granulocytes and agranulocytes are both types of leucocytes (WBCs).

Where are the unidirectional valves present?

  1. Arteries

  2. Veins

  3. Venules

  4. Capillaries

  5. All of the above

Show answer
Correct Option: B
Explanation:

Unidirectional valves are present in veins to prevent backflow of blood.

What causes the first heart sound or the "lub"?

  1. The sound of blood rushing out of the ventricles

  2. The closing of the mitral and tricuspid valves

  3. The closing of the pulmonary and aortic valves

  4. The sound of blood rushing into the auricles

  5. None of the above

Show answer
Correct Option: B
Explanation:

The first heart sound or "lub" results from closure of the tricuspid and mitral valves.

When does the auricles contract?

  1. During atrial systole

  2. Before atrial systole

  3. During atrial diastole

  4. Before atrial diastole

  5. After atrial diastole

Show answer
Correct Option: A
Explanation:

The auricles contract during auricular or atrial  systole.

The life span of WBC is approximately

  1. between 20 to 30 days

  2. between 80 to 100 days

  3. less than 10 days

  4. between 2 to 3 days

  5. more than a month

Show answer
Correct Option: A
Explanation:

The life span of WBC is approximately between 20 to 30 days.

Which of the following is formed by the joining of capillaries?

  1. Veins

  2. Arteries

  3. Venules

  4. Valves

  5. None of the above

Show answer
Correct Option: C
Explanation:

Capillaries fuse into larger vessels known as venules.

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