A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

B cells

T cells

Mast cells

Answer and Explanation

The Correct Answer is B

Choice A reason:

B cells are not involved in contact dermatitis, as they do not produce antibodies or form immune complexes.

Choice B reason:

T cells are the type of cells that mediate contact dermatitis, which is a type of type IV hypersensitivity. T cells recognize the poison ivy antigens that bind to the skin proteins and release cytokines that recruit macrophages and other inflammatory cells. This leads to a delayed and localized reaction that manifests as erythema, edema, vesicles, and pruritus.

Choice C reason:

T cells are not the same as B cells, as they have different receptors and functions in the immune system.

Choice D reason:

Mast cells are not involved in contact dermatitis, as they do not express IgE antibodies or release histamine.

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Correct Answer is C

Explanation

Choice A reason:

Bacteria are microorganisms that have a cell wall composed of peptidoglycan and a cell membrane composed of phospholipids. They can be classified by their shape (cocci or bacilli), their Gram stain (positive or negative), or their oxygen requirement (aerobic or anaerobic).

Choice B reason:

Viruses are microorganisms that have a nucleic acid core (DNA or RNA) surrounded by a protein coat (capsid) and sometimes an envelope derived from the host cell membrane. They can only replicate inside living cells and cause various diseases such as influenza, herpes, hepatitis, or AIDS.

Choice C reason:

Fungi are microorganisms that have a cell wall composed of chitin and a cell membrane composed of ergosterol. They can exist as yeasts or molds depending on the environmental conditions. Candida albicans is an example of fungi that can cause infections such as thrush, vaginitis, or systemic candidiasis.

Choice D reason:

Parasites are microorganisms that live on or in another organism (host) and derive nutrients from it. They can be classified by their size (protozoa or helminths) or their mode of transmission (vector-borne or direct contact). They can cause infections such as malaria, giardiasis, or schistosomiasis.

A. Increased hydrostatic pressure in the portal vein B. Decreased oncotic pressure in the plasma C. Increased aldosterone secretion by the adrenal glands D. All of the above

Correct Answer is D

Explanation

Choice A reason:

Increased hydrostatic pressure in the portal vein is one factor that causes ascites. The portal vein carries blood from the digestive organs to the liver for processing. However, when the liver is damaged by alcohol abuse, it becomes scarred and fibrotic, creating resistance to blood flow. This results in increased pressure in the portal vein and its branches, which forces fluid out of the capillaries into the abdominal cavity.

Choice B reason:

Decreased oncotic pressure in the plasma is another factor that causes ascites. Oncotic pressure is the force exerted by proteins in the plasma that attracts fluid into the capillaries from the interstitial space. However, when the liver is damaged by alcohol abuse, it cannot produce enough proteins, such as albumin and globulin, which are essential for maintaining oncotic pressure. This results in decreased oncotic pressure in the plasma and increased fluid movement into the interstitial space and the abdominal cavity.

Choice C reason:

Increased aldosterone secretion by the adrenal glands is another factor that causes ascites. Aldosterone is a hormone that regulates the balance of sodium and water in the body. It acts on the kidneys to increase the reabsorption of sodium and water from the urine into the blood. However, when the liver is damaged by alcohol abuse, it cannot metabolize aldosterone properly, leading to its accumulation in the blood. This results in increased sodium and water retention in the body and increased fluid movement into the interstitial space and the abdominal cavity.

Choice D reason:

Ascites is caused by a combination of factors that affect the fluid balance in the abdominal cavity.

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A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who has an infection caused by Candida albicans. The nurse understands that this microorganism belongs to what group of microorganisms?

Correct Answer is C

Explanation

A nurse is caring for a client who has liver failure due to alcohol abuse. The nurse observes that the client has ascites, which is an accumulation of fluid in the abdominal cavity. The nurse understands that this condition is caused by:

Correct Answer is D

Explanation

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A nurse is caring for a client who has an infection caused by Streptococcus pyogenes. The nurse understands that this microorganism belongs to what group of bacteria?

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