Which of the following arteries emerges from ascending aorta?
Left phrenic artery
Left coronary artery
Left subclavian artery
Left intercostal artery
The Correct Answer is B
a. Left phrenic artery: The left phrenic artery arises from the abdominal aorta, not the ascending aorta. It supplies blood to the diaphragm.
b. Left coronary artery: The ascending aorta is the first section of the aorta, the major artery leaving the heart. It branches out to give rise to several arteries, including the left coronary artery, which supplies blood to the left side of the heart muscle.
c. Left subclavian artery: The left subclavian artery arises from the aortic arch, not directly from the ascending aorta. It supplies blood to the left arm and head.
d. Left intercostal artery: The intercostal arteries arise directly from the aorta, not specifically the ascending aorta. They supply blood to the muscles and tissues between the ribs.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a: Cervical: 7, Thoracic: 14, Lumbar: 6 - This count for the thoracic vertebrae is incorrect; there are typically 12 thoracic vertebrae.
b. Cervical: 7, Thoracic: 12, Lumbar: 5-The vertebral column consists of cervical (neck), thoracic (upper back), lumbar (lower back), sacral, and coccygeal regions. The cervical region has 7 vertebrae, the thoracic region has 12, and the lumbar region has 5.
c: Cervical: & Thoracic: 12, Lumbar: 5, Sacral: 3 - This count for the cervical vertebrae is incorrect; there are typically 7 cervical vertebrae.
d: Cervical: & Thoracic: 14, Lumbar: Sacral: 4 - The counts for cervical and lumbar vertebrae are incorrect; there are typically 7 cervical vertebrae and 5 lumbar vertebrae.
Correct Answer is D
Explanation
a. Decrease in hydrogen ions: A decrease in hydrogen ions (H+) would indicate a condition of alkalosis, not acidosis.
b. Decrease in carbon dioxide: A decrease in carbon dioxide (CO2) usually leads to respiratory alkalosis because CO2 is acidic in nature.
c. Decrease in ketones: Ketones are acidic compounds, and their decrease is not associated with acidosis. In fact, an increase in ketones can cause ketoacidosis.
d. Decrease in bicarbonate ions: Bicarbonate (HCO3-) is a base, and a decrease in its concentration can lead to metabolic acidosis, as it reduces the buffering capacity of the blood against excess H+.
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