Which of the following structures moves downward to close the trachea during the process of swallowing?
Epiglottis
Vestibular fold
Uvula
Cricoid cartilage
The Correct Answer is A
a. Epiglottis: The epiglottis is a small flap of cartilage located above the larynx (voice box). During swallowing, the epiglottis folds down to cover the opening of the trachea, preventing food or drink from entering the airway and causing choking.
b. Vestibular fold: Vestibular folds are also known as false vocal cords. They do not play a major role in preventing food or drink from entering the airway.
c. Uvula: The uvula is a small, fleshy projection hanging from the back of the soft palate. It does not directly cover the trachea during swallowing.
d. Cricoid cartilage: The cricoid cartilage is a ring-shaped cartilage located at the base of the larynx. It provides structural support and does not move significantly during swallowing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Purkinje fibers: Purkinje fibers are the last structures to receive the signal within the ventricles, causing them to contract.
b. Bundle of His: The correct sequence of the cardiac conduction system is as follows: The electrical impulse originates in the sinoatrial (SA) node, then travels to the atrioventricular (AV) node. From the AV node, the impulse travels to the Bundle of His. After the Bundle of His, the impulse travels through the bundle branches and finally reaches the Purkinje fibers, which facilitate the contraction of the ventricles.
c. Bundle branches: The electrical impulse for heartbeat originates in the SA node (sinoatrial node). It then travels to the AV node (atrioventricular node), which delays the signal before sending it to the Bundle of His. The Bundle of His splits into right and left bundle branches, which distribute the electrical signal to the Purkinje fibers in the ventricles, causing them to contract in a coordinated fashion.
d. SA node: The SA node initiates the electrical impulse, not receive it after the AV node.
Correct Answer is C
Explanation
a: Adrenal cortex and calcitonin hormone - Calcitonin is primarily secreted by the thyroid gland, not the adrenal cortex.
b: Hypothalamus and prolactin hormone - Prolactin is primarily secreted by the anterior pituitary gland, not the hypothalamus.
c. Anterior pituitary and growth hormone -The anterior pituitary gland secretes growth hormone (GH), which regulates growth, metabolism, and development.
d: Thyroid and thyroid-stimulating hormone - Thyroid-stimulating hormone (TSH) is secreted by the anterior pituitary gland, not the thyroid gland directly.
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