Biology

Human Immunity and Blood

2,051 Questions

Human immunity and blood questions cover the physiological mechanisms protecting the body against diseases and the components of blood. Topics include blood groups, cell mediated immunity, monoclonal antibodies, and blood coagulation. These biology topics frequently appear in general science sections of competitive exams.

Blood groupsCell mediated immunityMonoclonal antibodiesBlood coagulationCancer immunology

Human Immunity and Blood Questions

Multiple choice

Which type of MHC molecule is responsible for presenting antigens to CD8+ T cells?

  1. MHC class I

  2. MHC class II

  3. Both MHC class I and MHC class II

  4. Neither MHC class I nor MHC class II
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

MHC class I molecules are responsible for presenting antigens to CD8+ T cells.

Multiple choice

Which cytokine is responsible for activating macrophages?

  1. Interferon-gamma

  2. Tumor necrosis factor-alpha

  3. Interleukin-1

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interferon-gamma, tumor necrosis factor-alpha, and interleukin-1 are all cytokines that can activate macrophages.

Multiple choice

Which type of immune cell is responsible for phagocytosis?

  1. Neutrophils

  2. Macrophages

  3. Dendritic cells

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Neutrophils, macrophages, and dendritic cells are all phagocytes, which means they can engulf and destroy foreign particles.

Multiple choice

Which type of immune cell is responsible for recognizing and destroying infected cells?

  1. B cells

  2. T cells

  3. Natural killer cells

  4. Macrophages
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

T cells are a type of white blood cell that plays a central role in the adaptive immune response. They recognize and destroy infected cells, as well as cancer cells.

Multiple choice

Which mathematical technique is commonly used to understand the evolution of immune responses?

  1. Phylogenetics

  2. Population genetics

  3. Game theory

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phylogenetics, population genetics, and game theory are all mathematical techniques that are commonly used to understand the evolution of immune responses.

Multiple choice

Which immune cells are primarily involved in neuroinflammation?

  1. Neutrophils

  2. Macrophages

  3. Microglia

  4. T cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Microglia are the resident immune cells of the central nervous system. They are constantly surveying the brain environment and can rapidly respond to changes, including infection, injury, or neurodegeneration. When activated, microglia release pro-inflammatory cytokines and chemokines, which can contribute to neuroinflammation.

Multiple choice

Which signaling pathway is commonly activated in neuroimmunological disorders?

  1. JAK/STAT pathway

  2. MAPK pathway

  3. NF-κB pathway

  4. PI3K/Akt pathway
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The NF-κB pathway is a key signaling pathway involved in the regulation of inflammation and immune responses. In neuroimmunological disorders, activation of the NF-κB pathway can lead to the production of pro-inflammatory cytokines, chemokines, and other inflammatory mediators, contributing to neuroinflammation and neuronal damage.

Multiple choice

What is the role of the complement system in neuroimmunological disorders?

  1. Promoting inflammation and tissue damage

  2. Regulating immune cell activation and differentiation

  3. Maintaining immune homeostasis

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The complement system is a complex network of proteins that plays a role in the innate immune response. In neuroimmunological disorders, activation of the complement system can lead to the formation of membrane attack complexes, which can damage neuronal membranes and contribute to neuronal death. Additionally, complement activation can promote inflammation and tissue damage by releasing pro-inflammatory cytokines and chemokines.

Multiple choice

Which type of immune cell is primarily responsible for antigen presentation in the central nervous system?

  1. Neutrophils

  2. Macrophages

  3. Microglia

  4. Astrocytes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Astrocytes are star-shaped glial cells that play a variety of roles in the central nervous system, including antigen presentation. Astrocytes can express MHC class II molecules, which are necessary for presenting antigens to T cells. This allows T cells to recognize and respond to foreign antigens in the brain, contributing to the immune response in neuroimmunological disorders.

Multiple choice

What is the term for the process by which immune cells cross the blood-brain barrier?

  1. Diapedesis

  2. Transcytosis

  3. Extravasation

  4. Chemotaxis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diapedesis is the process by which immune cells cross the blood-brain barrier. It involves the migration of immune cells through the tight junctions between endothelial cells of the BBB. Diapedesis is a critical step in the immune response to infection or injury in the central nervous system, allowing immune cells to enter the brain and target pathogens or damaged cells.

Multiple choice

Which molecule is commonly used to assess blood-brain barrier integrity in neuroimmunological disorders?

  1. Albumin

  2. IgG

  3. Gadolinium

  4. Transferrin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gadolinium is a contrast agent commonly used in magnetic resonance imaging (MRI) to assess blood-brain barrier integrity. Gadolinium is normally excluded from the brain by the BBB, but in cases of BBB leakage, it can enter the brain parenchyma and enhance the MRI signal. This allows clinicians to visualize areas of BBB disruption and monitor the progression of neuroimmunological disorders.