Which stage of the HIV lifecycle involves the virus attaching to the host cell membrane?
Binding
Integration
Fusion
Reverse Transcription
The Correct Answer is A
A. Binding is the initial step where the HIV virus attaches to the CD4 receptor on the host cell's surface. This interaction is crucial for the subsequent entry of the virus into the host cell.
B. Integration occurs later in the lifecycle, after the virus has entered the host cell and its RNA is converted to DNA.
C. Fusion refers to the process where the viral envelope fuses with the host cell membrane to allow entry into the cell, which follows the binding stage.
D. Reverse Transcription is the process of converting viral RNA into DNA after the virus has entered the host cell, and is not involved in the attachment phase.
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Correct Answer is B
Explanation
A. Metabolic alkalosis is characterized by an increased pH and increased HCO3 levels, which does not fit the provided values.
B. The low HCO3 of 18 mEq indicates a metabolic acidosis, as the body is unable to retain enough bicarbonate to balance the acid levels, and the pH is also low at 7.30, confirming acidosis.
C. Respiratory alkalosis would show a high pH and low PaCO2, which is not the case here.
D. Respiratory acidosis would be indicated by a high PaCO2 and a low pH, but the HCO3 level is low, indicating a metabolic issue rather than a respiratory one.
Correct Answer is A
Explanation
A. Cardiac tamponade is a condition where fluid accumulates in the pericardial space, exerting pressure on the heart and impeding its ability to pump effectively, leading to obstructive shock.
B. Third spacing refers to fluid accumulation in the interstitial spaces but is not a specific diagnosis of obstructive shock.
C. A ruptured aneurysm may lead to hypovolemic shock due to blood loss rather than obstructive shock, which is characterized by physical obstruction to blood flow.
D. Cardiomyopathy is a disease of the heart muscle that affects its ability to pump blood, leading to cardiogenic shock, not obstructive shock.