Obstructive sleep apnea occurs when __.
Group of answer choices
A A disruption in signals that regulate breathing, which are sent from the brain, cause periods of interrupted breathing.
B An individual dreams she cannot breathe and wakes up in a panic.
C An individual’s airway becomes blocked during sleep.
D Signals sent from the brain that regulate breathing are blocked in the hypothalamus.
The correct answer and explanation is :
The correct answer is:
C. An individual’s airway becomes blocked during sleep.
Explanation:
Obstructive sleep apnea (OSA) is a condition in which the airway becomes partially or completely blocked during sleep, leading to disruptions in breathing. This blockage typically occurs when the muscles in the back of the throat relax excessively during sleep, causing a temporary obstruction of the upper airway. As a result, airflow to the lungs is reduced or completely halted, leading to pauses in breathing that can last from a few seconds to minutes. These interruptions in breathing are often followed by brief arousals from sleep, though the person may not be aware of them. This cycle can occur multiple times throughout the night, leading to fragmented sleep and decreased oxygen levels in the blood.
The blockage in the airway occurs in the upper respiratory tract, primarily due to the relaxation of the soft tissues in the throat, which include the tongue and the soft palate. In severe cases, the airway can collapse completely, causing more pronounced episodes of apnea (cessation of breathing). When the airway is blocked, the brain detects the lack of oxygen and sends a signal to wake the individual in order to restore normal breathing. This leads to micro-awakenings that disrupt sleep, contributing to daytime fatigue, poor concentration, and irritability.
While the person may not always remember waking up during the night, these disruptions can result in significant daytime sleepiness, headaches, and mood disturbances. Over time, untreated OSA can lead to serious health problems, including high blood pressure, heart disease, stroke, and diabetes.
In contrast, answers A, B, and D describe other causes or misinterpretations of sleep-related breathing issues. The main characteristic of OSA is the physical obstruction of the airway, not the malfunction of signals from the brain or a dream experience.