Dr Gawad Physiology Course Online Exam - Blood – Course Lecture 1- Plasma & Plasma Proteins
15 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 15 (you will get your result immediately by the web)
Allowed time: 15 min
Good Luck
dr Mohammed Abel Gawad
- 1.
•which of the following plasma proteins is responsible for immunity:
- A.
•gamma globulin.
- B.
•fibrinogen
- C.
•Prothrombin.
- D.
•albumin.
Correct Answer
A. •gamma globulin.Explanation
Gamma globulin is responsible for immunity because it is a type of plasma protein that contains antibodies. Antibodies are essential components of the immune system and play a crucial role in recognizing and neutralizing foreign substances such as bacteria and viruses. Gamma globulin is produced by specialized cells of the immune system called plasma cells and is involved in the body's defense against infections. Fibrinogen is involved in blood clotting, prothrombin is a precursor to thrombin (also involved in blood clotting), and albumin is responsible for maintaining osmotic pressure and transporting various substances in the blood.Rate this question:
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- 2.
•the amount of plasma proteins is about:
- A.
10 gm%
- B.
•7 gm%
- C.
7mgm%
- D.
•30 gm%
Correct Answer
B. •7 gm%Explanation
The correct answer is 7 gm%. This means that the amount of plasma proteins in the given context is approximately 7 grams per 100 milliliters of plasma.Rate this question:
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- 3.
•the plasma proteins perform all the following except:
- A.
•They exert an osmotic force.
- B.
•They have a buffering action.
- C.
•They increase the capillary permeability.
- D.
•They help maintenance of the arterial blood pressure.
- E.
•They play a role in the body defense mechanisms.
Correct Answer
C. •They increase the capillary permeability.Explanation
Plasma proteins perform various functions in the body, including exerting an osmotic force to maintain fluid balance, buffering pH levels, helping to maintain arterial blood pressure, and playing a role in the body's defense mechanisms. However, they do not increase capillary permeability. Capillary permeability is mainly regulated by other factors such as inflammation and certain signaling molecules.Rate this question:
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- 4.
•the plasma albumin is specially needed for:
- A.
•Immunity.
- B.
•Production of osmotic pressure.
- C.
Blood coagulation.
- D.
•All of the above.
Correct Answer
B. •Production of osmotic pressure.Explanation
Plasma albumin is specifically needed for the production of osmotic pressure. Osmotic pressure is responsible for maintaining the balance of fluids between the blood vessels and the tissues. Albumin helps to regulate this pressure by attracting water and preventing it from leaking out of the blood vessels. It also helps to transport various substances such as hormones, drugs, and fatty acids in the bloodstream. While immunity and blood coagulation are important functions in the body, they are not directly related to the role of plasma albumin in producing osmotic pressure.Rate this question:
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- 5.
•regarding fibrinogen, it is responsible for:
- A.
•Immunity.
- B.
•Production of osmotic pressure.
- C.
Blood coagulation.
- D.
•All of the above.
Correct Answer
C. Blood coagulation.Explanation
Fibrinogen is a protein found in blood plasma that plays a crucial role in the process of blood coagulation or clotting. When there is an injury or damage to blood vessels, fibrinogen is converted into fibrin, which forms a mesh-like structure to trap platelets and form a blood clot. This clotting process helps to prevent excessive bleeding and promotes wound healing. Therefore, the correct answer is blood coagulation.Rate this question:
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- 6.
•plasma proteins function is:
- A.
•secretion of hormones.
- B.
Transportation of hormones.
- C.
•synthesis of hormones.
- D.
•all of the above.
Correct Answer
B. Transportation of hormones.Explanation
Plasma proteins are responsible for the transportation of hormones. Hormones are chemical messengers that regulate various bodily functions, and they need to be transported throughout the body to reach their target organs or tissues. Plasma proteins, such as albumin and globulins, act as carriers for hormones, allowing them to travel through the bloodstream and reach their intended destinations. This transportation function is crucial for the proper functioning of the endocrine system and maintaining overall hormonal balance in the body.Rate this question:
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- 7.
Plasma gamma globulin is synthesized by:
- A.
Liver.
- B.
•Heart.
- C.
Lungs.
- D.
•Lymphoid system
Correct Answer
D. •LympHoid systemExplanation
Plasma gamma globulin is synthesized by the lymphoid system. The lymphoid system includes various organs and tissues such as the bone marrow, thymus, spleen, and lymph nodes. These organs are responsible for producing lymphocytes, a type of white blood cell, which in turn produce gamma globulins. Gamma globulins are a group of proteins that are important for the immune system, as they help in fighting off infections and providing immunity against diseases. Therefore, it is the lymphoid system that synthesizes plasma gamma globulin.Rate this question:
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- 8.
•the viscosity produced by plasma proteins is mainly due to:
- A.
Prothrombin.
- B.
•Albumin.
- C.
Fibrinogen.
- D.
•All of the above.
Correct Answer
C. Fibrinogen.Explanation
The correct answer is Fibrinogen. Fibrinogen is a plasma protein that plays a crucial role in blood clotting. When there is an injury or damage to blood vessels, fibrinogen is converted into fibrin, which forms a mesh-like structure to trap platelets and form a blood clot. This process helps in stopping bleeding. Prothrombin is also involved in blood clotting, but it is not primarily responsible for the viscosity produced by plasma proteins. Albumin is another plasma protein, but it does not contribute significantly to blood viscosity. Therefore, the correct answer is Fibrinogen.Rate this question:
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- 9.
•plasma is about:
- A.
1 liter of the total blood volume.
- B.
•2 L
- C.
•4 L
- D.
•none of the above.
Correct Answer
D. •none of the above.Explanation
The given answer "none of the above" is correct because plasma is not about 1 liter, 2 liters, or 4 liters of the total blood volume. Plasma actually constitutes about 55% of the total blood volume, which is approximately 2.5-3 liters in an average adult. Therefore, none of the given options accurately represent the volume of plasma in the blood.Rate this question:
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- 10.
•In the plasma:
- A.
•Water constitutes about 60 % of its total volume.
- B.
•The main cation is sodium at a concentration of 42 mEq /litre.
- C.
•The concentration of plasma proteins is about 7 gm %.
- D.
•The inorganic constituents concentration is 0.19 %.
- E.
•The greater portion of the total body water is present.
Correct Answer
C. •The concentration of plasma proteins is about 7 gm %.Explanation
Plasma proteins are an important component of the plasma and play various roles in the body, including maintaining osmotic pressure, transporting substances, and regulating immune responses. The concentration of plasma proteins being about 7 gm % indicates that there is a sufficient amount of these proteins present in the plasma. This is crucial for maintaining the normal functioning of the body and ensuring that these proteins can carry out their functions effectively.Rate this question:
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- 11.
•prothrombin is important for:
- A.
Immunity
- B.
•osmosis.
- C.
Phagocytosis.
- D.
•coagulation.
Correct Answer
D. •coagulation.Explanation
Prothrombin is an important protein in the blood clotting process, also known as coagulation. It is converted into thrombin, which helps in the formation of a blood clot to prevent excessive bleeding. This process is crucial for stopping bleeding from injuries and maintaining the integrity of blood vessels. Therefore, prothrombin's role in coagulation makes it the correct answer.Rate this question:
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- 12.
•Osmotic pressure of plasma protein is caused by …….. and is about ……...:
- A.
•fibrinogen, 40 mmHg
- B.
•albumin, 25 mmHg
- C.
•fibrinogen, 25 mmHg
- D.
•albumin 50 mmHg
Correct Answer
B. •albumin, 25 mmHgExplanation
The osmotic pressure of plasma protein is caused by albumin and is about 25 mmHg. Albumin is a major protein found in the plasma and plays a crucial role in maintaining osmotic pressure. It helps to regulate the movement of fluids between the blood vessels and tissues by attracting water molecules and preventing excessive fluid leakage. The osmotic pressure exerted by albumin helps to maintain the balance of fluids in the body.Rate this question:
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- 13.
Blood viscosity is mainly due to:
- A.
•fibrinogen
- B.
•prothrombin
- C.
•albumin
- D.
•RBCs
Correct Answer
D. •RBCsExplanation
Blood viscosity refers to the thickness or stickiness of blood. It is mainly determined by the presence of various components in the blood. Red blood cells (RBCs) play a crucial role in blood viscosity. RBCs are the most abundant cells in the blood and their shape and quantity contribute to the viscosity. The disc-like shape of RBCs allows them to flow smoothly through blood vessels, but if there is an increased number of RBCs or if they are abnormally shaped, it can lead to increased blood viscosity. Therefore, RBCs are a major factor in determining blood viscosity.Rate this question:
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- 14.
pH of the arterial blood is:
- A.
•7.3 ± 0.02
- B.
•7.38 ± 0.02
- C.
•7.5 ± 0.02
- D.
•7.4 ± 0.02
Correct Answer
D. •7.4 ± 0.02Explanation
The pH of arterial blood is important for maintaining the body's acid-base balance. A pH of 7.4 is considered normal for arterial blood. The range of ± 0.02 indicates that a slight deviation from 7.4 is still within the acceptable range for arterial blood pH. This narrow range is necessary for proper functioning of various physiological processes in the body.Rate this question:
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- 15.
Fibrinogen is responsible for:
- A.
•osmosis
- B.
•viscocity
- C.
•blood clotting
- D.
•b & c
Correct Answer
D. •b & cExplanation
Fibrinogen is responsible for viscosity and blood clotting. Viscosity refers to the thickness or stickiness of a fluid, and fibrinogen plays a role in maintaining the viscosity of blood. Additionally, fibrinogen is a key component in the process of blood clotting, where it is converted into fibrin to form a clot and stop bleeding. Therefore, the correct answer is "b & c" as fibrinogen is responsible for both viscosity and blood clotting.Rate this question:
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