Select the least correct or not a correct match. a. Class II MHC protein--on B c

Question

Select the least correct or not a correct match. a. Class II MHC protein--on B cells, macrophages, and dendritic cells b. cytotoxic T cells--bind antigen combined with Class II MHC proteins c. antigen presenting cells for cytotoxic T cells-cells with endogenous antigen d. cells infected with a virus--can present to cytotoxic T cells e. Class I MHC protein--on all cells with a nucleus

The pericardial fluid is located between the _____________ and the _______________. A) epicardium, visceral pericardium B) parietal pericardium, fibrous pericardium C) myocardium, endocardium D) endocardium, visceral pericardium E) visceral pericardium, parietal pericardium

You have a patient whose electrocardiogram (EKG) is described as having “no correlation between P waves and QRS complexes”. Given the description of the EKG, which of the following is most likely occurring in this patient? A) partial heart block B) complete heart block C) a problem with the SA node D) tachycardia

Explanation / Answer

The class II MHC occurs on antigen presenting cells like B cells, macrophages, and dendritic cells. The cytotoxic T cells involved in processing of endogenous antigens presented by antigen presenting cells. All nucleated cells possess class I MHC molecules except the RBC. The cytotoxic T cells bind with antigen combined with class I MHC m olecules. The option b is correct.

Pericardial fluid is the fluid found in two layers of heart wall or pericardium. The two layers include parietal and visceral pericardium. Therefore, option E is correct.

No correlation between P waves and QRS complexes represents Atrioventricular dissociation which may result in bradycardia and reflects the condition of partial hear block. Option A is correct.

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