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General Medicine
Pulsus paradoxus is a clinical sign characterized by a drop in blood pressure during inspiration. It is commonly seen in conditions like asthma, where airway obstruction leads to significant changes in intrathoracic pressure.
General Microbiology
Prions are infectious agents composed solely of protein. They do not have nucleic acids like DNA or RNA and are responsible for several neurodegenerative diseases. The primary reservoir for prions is thus the proteinaceous particles themselves.
Physiology
The vagus nerve, a part of the parasympathetic nervous system, has a negative chronotropic effect on the heart, meaning it decreases the heart rate. It does this by releasing acetylcholine onto the sinoatrial (S1) node, which slows the SA node's p