Multiple Choice
In the organization of the thoracic cavity, the heart is within the ________.
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1. Introduction to Anatomy & Physiology
Organization of the Body: Thoracic Cavity
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In the context of thoracic cavity anatomy, what is the cardiac notch?
A
The anterior midline ridge of the sternum where ribs articulate via costal cartilage
B
An indentation on the left lung that accommodates the heart
C
The opening in the diaphragm through which the inferior vena cava passes
D
The inferior angle of the scapula where the lungs are auscultated posteriorly
Verified step by step guidance1
Step 1: Understand the anatomical context of the thoracic cavity, which houses the lungs and heart, among other structures.
Step 2: Recognize that the cardiac notch is a specific feature related to the lungs, particularly the left lung, due to the position of the heart.
Step 3: Recall that the cardiac notch is an indentation or concave area on the anterior border of the left lung that allows space for the heart to fit snugly within the thoracic cavity.
Step 4: Differentiate the cardiac notch from other thoracic landmarks such as the sternum's anterior midline ridge, the diaphragm openings, and scapular angles, which serve different anatomical functions.
Step 5: Conclude that the cardiac notch is best described as the indentation on the left lung that accommodates the heart.
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