What Is The Average Lifespan Of A Red Blood Cell?
4
- 1.
Blood is composed of all of the following except:
- A.
Plasma
- B.
Interstitial fluid
- C.
Blood cells
- D.
Cell fragments
- E.
Formed elements
Correct Answer
B. Interstitial fluidExplanation
Blood is composed of plasma, blood cells, cell fragments, and formed elements. Interstitial fluid, on the other hand, is the fluid that surrounds and bathes the cells in the tissues. It is not a component of blood itself.Rate this question:
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- 2.
The formed elements of the blood include
- A.
Lipoproteins
- B.
Albumins
- C.
Clotting proteins
- D.
Blood cells
- E.
Defense proteins
Correct Answer
D. Blood cellsExplanation
The correct answer is blood cells because the formed elements of the blood refer to the cellular components, which include red blood cells, white blood cells, and platelets. Lipoproteins, albumins, clotting proteins, and defense proteins are not considered formed elements of the blood as they are not cellular in nature.Rate this question:
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- 3.
The most abundant proteins in blood plasma are
- A.
Albumins
- B.
Lipoproteins
- C.
Fibrinogens
- D.
Globulins
- E.
Transport proteins
Correct Answer
A. AlbuminsExplanation
Albumins are the most abundant proteins in blood plasma. They are synthesized in the liver and play a crucial role in maintaining the osmotic pressure of blood, transporting various substances such as hormones, fatty acids, and drugs, and regulating pH balance. Albumins also contribute to the body's defense mechanisms by binding to and transporting certain drugs and toxins. Overall, albumins are essential for maintaining the proper functioning of the circulatory system and ensuring the stability of the blood plasma.Rate this question:
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- 4.
The average lifespan of a red blood cell is
- A.
1 year
- B.
1 week
- C.
4 months
- D.
6 months
- E.
1 month
Correct Answer
C. 4 monthsExplanation
The correct answer is 4 months. Red blood cells, also known as erythrocytes, have a lifespan of around 120 days or approximately 4 months. They are constantly being produced in the bone marrow and replaced as old cells die off. This turnover ensures a healthy supply of oxygen-carrying cells in the bloodstream.Rate this question:
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- 5.
A hemoglobin molecule is composed of
- A.
Three protein chains
- B.
Two protein chains
- C.
Four protein chains and nothing else
- D.
Four protein chains and four heme groups
- E.
Four heme groups but no protein
Correct Answer
D. Four protein chains and four heme groupsExplanation
A hemoglobin molecule is composed of four protein chains and four heme groups. Hemoglobin is a complex protein found in red blood cells that is responsible for carrying oxygen from the lungs to the body's tissues. The protein chains in hemoglobin are known as globin chains, and there are four of them in each molecule. These globin chains are surrounded by four heme groups, which are responsible for binding to oxygen molecules. Together, the protein chains and heme groups form the structure of the hemoglobin molecule, allowing it to efficiently transport oxygen throughout the body.Rate this question:
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- 6.
Most of the iron that is removed from degraded hemoglobin is
- A.
Stored in yellow bone marrow
- B.
Excreted by the liver
- C.
Excreted by the intestines
- D.
Recycled to the bone marrow
- E.
Excreted by the kidneys
Correct Answer
D. Recycled to the bone marrowExplanation
Iron is an essential component of hemoglobin, the molecule responsible for carrying oxygen in the blood. When hemoglobin is degraded, the iron is released and needs to be recycled. The correct answer states that most of the iron is recycled to the bone marrow. This is because the bone marrow is responsible for producing new red blood cells, which require iron to form hemoglobin. Therefore, recycling the iron back to the bone marrow ensures that it can be used again in the production of new hemoglobin and red blood cells.Rate this question:
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- 7.
Erythropoiesis increases when
- A.
Carbon dioxide levels in the blood increase
- B.
Oxygen levels in the blood decrease
- C.
Oxygen levels in the blood increase
- D.
Protein levels in the blood increase
- E.
Carbon dioxide levels in the blood decrease
Correct Answer
B. Oxygen levels in the blood decreaseExplanation
Erythropoiesis is the process of producing red blood cells. When oxygen levels in the blood decrease, it indicates a lower oxygen-carrying capacity, which triggers the body to produce more red blood cells to compensate for the deficiency. This increase in erythropoiesis helps to enhance the oxygen-carrying capacity of the blood, ensuring that sufficient oxygen is delivered to the body's tissues and organs.Rate this question:
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- 8.
A normal adult hematrocrit would be
- A.
45
- B.
100
- C.
75
- D.
66
- E.
10
Correct Answer
A. 45Explanation
A normal adult hematocrit refers to the percentage of red blood cells in the total blood volume. A hematocrit of 45 indicates that 45% of the blood volume is composed of red blood cells, which is within the normal range for adults. This value is commonly used to assess the oxygen-carrying capacity of the blood and can help diagnose conditions such as anemia or polycythemia.Rate this question:
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- 9.
All of the following are true of neurtrophils except that they are
- A.
Important in coagulation
- B.
Phagocytic
- C.
Granular leukocytes
- D.
Also known as polymorphonuclear leukocytes
- E.
Active in fighting bacterial infections
Correct Answer
A. Important in coagulationExplanation
Neutrophils are a type of white blood cell that are known for their phagocytic abilities and their role in fighting bacterial infections. They are also granular leukocytes and are commonly referred to as polymorphonuclear leukocytes. However, they are not important in coagulation. Coagulation is the process of blood clotting, which involves platelets and clotting factors, but not neutrophils. Therefore, the correct answer is that neutrophils are not important in coagulation.Rate this question:
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- 10.
Red blood cell production is regulated by the hormone
- A.
Cobalamin
- B.
Thymosin
- C.
M-CSF
- D.
Angiotensin I
- E.
Erythropoietin
Correct Answer
E. ErythropoietinExplanation
Erythropoietin is the correct answer because it is a hormone that regulates the production of red blood cells. When the body detects low levels of oxygen in the blood, it signals the production of erythropoietin, which then stimulates the bone marrow to produce more red blood cells. This hormone plays a crucial role in maintaining the balance of red blood cells in the body and ensuring adequate oxygen supply to tissues and organs.Rate this question:
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- 11.
The function of hemoglobin is to
- A.
Carry oxygen
- B.
Aid in the process of blood clotting
- C.
Protect the body against infectious agents
- D.
Carry nutrients from the intestine to the body's cells
- E.
Both A and C
Correct Answer
A. Carry oxygenExplanation
Hemoglobin is a protein found in red blood cells that binds to oxygen molecules and transports them throughout the body. It has a high affinity for oxygen, allowing it to efficiently pick up oxygen in the lungs and release it in tissues that need it. This process is essential for the delivery of oxygen to cells and tissues, enabling them to carry out their metabolic functions. Therefore, the function of hemoglobin is to carry oxygen.Rate this question:
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- 12.
The process of red blood cell production is called
- A.
Hemocytosis
- B.
Erythrocytosis
- C.
Erythropoiesis
- D.
Hematopenia
- E.
Erythropenia
Correct Answer
C. ErythropoiesisExplanation
Erythropoiesis is the correct answer because it refers to the process of red blood cell production. The term "hemocytosis" is incorrect as it refers to an abnormal increase in the number of blood cells. "Erythrocytosis" is also incorrect as it refers to an abnormal increase in the number of red blood cells. "Hematopenia" and "erythropenia" are both incorrect as they refer to a decrease in the number of red blood cells.Rate this question:
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- 13.
A person's blood type is determined by the
- A.
Number of specific molecules on the cell membrane
- B.
Presence or absence of specific antigen on the cell membrane
- C.
Shape of the red blood cells
- D.
Chemical character of the hemoglobin
- E.
Size of the red blood cells
Correct Answer
B. Presence or absence of specific antigen on the cell membraneExplanation
A person's blood type is determined by the presence or absence of specific antigens on the cell membrane. These antigens are substances that can stimulate an immune response in the body. Different blood types have different antigens present on their red blood cells, which is why blood type is determined by the presence or absence of these specific antigens.Rate this question:
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- 14.
A person with type A negative blood
- A.
Would have neither the A or B antigen but does have the RH antigen
- B.
Would have a RBC with B antigens and the RH antigen on the cell membrane
- C.
Would have a RBC with A antigens and the RH antigen on the cell membrane
- D.
Would only have the A antigen
- E.
Would have the A antigen but does not have the RH antigen
Correct Answer
E. Would have the A antigen but does not have the RH antigenExplanation
A person with type A negative blood would have the A antigen but does not have the RH antigen. This means that their red blood cells have the A antigen on their cell membrane but do not have the RH antigen.Rate this question:
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- 15.
The most numerous white blood cells in the peripheral circulation are the
- A.
Monocytes
- B.
Eusinophils
- C.
Neutrophils
- D.
Lymphocytes
- E.
Basophils
Correct Answer
C. NeutropHilsExplanation
Neutrophils are the most numerous white blood cells in the peripheral circulation. They play a crucial role in the immune system's response to bacterial infections. Neutrophils are highly mobile and are the first cells to arrive at the site of an infection. They engulf and destroy invading bacteria through a process called phagocytosis. This high abundance of neutrophils in the bloodstream ensures a rapid and effective immune response against bacterial pathogens.Rate this question:
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- 16.
White blood cells that release histamine at the site of an injury are
- A.
Eusinophils
- B.
Monocytes
- C.
Basophils
- D.
Lymphocytes
- E.
Neutrophils
Correct Answer
C. BasopHilsExplanation
Basophils are a type of white blood cells that release histamine at the site of an injury. Histamine is a chemical mediator that promotes inflammation and helps in the immune response. Basophils are involved in allergic reactions and play a role in defending the body against parasites. They are characterized by the presence of granules containing histamine, which they release upon activation.Rate this question:
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- 17.
________ are large phagocytic white cells that spend most of their time outside of the blood as fixed and free phagocytic cells
- A.
Neutrophils
- B.
Eusinophils
- C.
Monocytes
- D.
Basophils
- E.
Lymphocytes
Correct Answer
C. MonocytesExplanation
Monocytes are large phagocytic white cells that spend most of their time outside of the blood as fixed and free phagocytic cells. They are part of the immune system and play a crucial role in engulfing and destroying foreign particles, such as bacteria and dead cells. Monocytes can differentiate into macrophages or dendritic cells, depending on the tissue they migrate to. This ability to transform into different cell types allows them to perform various immune functions and contribute to the body's defense against infections and diseases.Rate this question:
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- 18.
The white blood cells that are important in producing antibodies are the
- A.
Basophils
- B.
Neutrophils
- C.
Monocytes
- D.
Lymphocytes
- E.
Eusinophils
Correct Answer
E. EusinopHilsExplanation
Eosinophils are a type of white blood cell that play a crucial role in producing antibodies. They are part of the immune system and help to defend the body against infections and parasites. Eosinophils release substances that help to regulate inflammation and allergic reactions, and they are particularly important in combating certain types of infections. Overall, eosinophils are essential in the production of antibodies and the immune response.Rate this question:
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- 19.
Platelets function in all of the following, except:
- A.
Dissolving a formed clot
- B.
Transporting chemicals important for clotting
- C.
Contraction after clot formation
- D.
Initiating the clotting process
- E.
Forming temporary patches in injured areas
Correct Answer
A. Dissolving a formed clotExplanation
Platelets play a crucial role in the clotting process, but they do not dissolve a formed clot. Once a clot is formed, platelets help to stabilize it and prevent further bleeding by contracting and forming temporary patches in the injured area. They also transport chemicals important for clotting and initiate the clotting process by adhering to the injured blood vessel wall. However, the dissolution of a formed clot is primarily carried out by enzymes called plasmin, which break down the fibrin strands in the clot.Rate this question:
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- 20.
The following is a list of the steps involved in the process of hemostasis. 1. coagulation 2. fibrinolysis 3. vascular spasm 4. retraction 5. platelet phase The correct sequence of these steps is:
- A.
5, 1, 4, 2, 3
- B.
4, 3, 5, 2, 1
- C.
3, 5, 1, 4, 2
- D.
2, 3, 5, 1, 4
- E.
3, 5, 4, 1, 2
Correct Answer
C. 3, 5, 1, 4, 2Explanation
The correct sequence of the steps involved in the process of hemostasis is 3, 5, 1, 4, 2. First, there is a vascular spasm to constrict the blood vessels and reduce blood flow. Then, the platelet phase occurs, where platelets aggregate at the site of injury to form a temporary plug. Next, coagulation takes place, where a clot is formed to seal the wound. After that, retraction occurs, where the clot contracts and pulls the edges of the wound together. Finally, fibrinolysis happens, where the clot is broken down and dissolved.Rate this question:
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Mar 21, 2023Quiz Edited by
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May 01, 2011Quiz Created by
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