Human Anatomy and Physiology : Immune System

Study concepts, example questions & explanations for Human Anatomy and Physiology

varsity tutors app store varsity tutors android store

Example Questions

Example Question #11 : Immune System

Endothelial cell retraction involves which of the following?

Possible Answers:

Neutrophils

TNF-alpha

Histamine

Il-1

Correct answer:

Histamine

Explanation:

During endothelial cell retraction, gaps form between the cells as their cytoskeletons are rearranged to decrease the cell's area. This is a result of histamine, which causes increased vascular permeability; endothelial cell retraction allows fluids to pass between the cells, contributing to the inflammatory effects of histamine.

Example Question #12 : Immune System

Which of the following tests best detects antigens in serum?

Possible Answers:

Agglutination test

ELISA test

Precipitation test

DNA microarray

Correct answer:

ELISA test

Explanation:

An ELISA test would best look at antigens present in serum by using secondary antibodies to bind to antigen-antibody complex and change color, showing if an antigen is present. DNA microarray would just show genes activated. Precipitation and agglutination reactions are not as sensitive as ELISA.

Example Question #141 : Injuries And Disorders

Which type of white blood cell releases histamine and heparin?

Possible Answers:

Lymphocyte

Neutrophil

Basophil

Monocyte

Eosinophil

Correct answer:

Basophil

Explanation:

Neutrophils are responsible for destroying bacteria, eosinophils respond to parasitic worms and allergens, lymphocytes destroy cancerous or infected cells, and monocytes phagocytize pathogens and debris.

Example Question #142 : Injuries And Disorders

Which of the following cells is stimulated to release histamine?

Possible Answers:

Neutrophil

Macrophage

Mast cell

Natural killer cell

Correct answer:

Mast cell

Explanation:

Mast cell functions in allergic responses by release histamine and other chemicals that promote inflammation. Macrophages are part of the innate immune system and function to engulf and remove debris. Neutrophils are also part of the innate immune system and have macrophagic properties, especially when fighting bacterial infection. Natural killer cells bind to and destroy pathogens without the use of antigens.

Learning Tools by Varsity Tutors