Which of the following is the area of the brain that contains the medulla, pons, and midbrain?
Cerebellum
Brain stem
Ventricles
Chord plexus
The Correct Answer is B
a: Cerebellum - The cerebellum is responsible for coordination and balance but is not where the medulla, pons, and midbrain are located.
b. Brainstem-The brainstem is composed of the medulla oblongata, pons, and midbrain. It regulates many basic physiological functions such as heart rate, breathing, and sleep.
c: Ventricles - The ventricles are fluid-filled cavities within the brain, not regions containing the medulla, pons, and midbrain.
d: Choroid plexus - The choroid plexus produces cerebrospinal fluid (CSF) within the ventricles of the brain, but it is not where the medulla, pons, and midbrain are located.
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Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is D
Explanation
a. Decrease in sodium reabsorption: This would lead to further lowering of blood pressure, which is not a compensatory response.
b. Dilation of the afferent arteriole: This typically increases glomerular filtration rate but is not a primary response to decreased blood pressure.
c. Constriction of the efferent arteriole: This response helps to increase glomerular pressure but is secondary to other mechanisms.
d. Release of renin: Renin is released by the kidneys in response to low blood pressure, initiating the renin-angiotensin-aldosterone system (RAAS) to increase blood pressure by conserving sodium and water and constricting blood vessels.
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