The heart indents into the _______ of the left lung.
hilum
oblique fissure
base
cardiac notch
арех
The Correct Answer is D
A. Hilum: The hilum is the region where bronchi, blood vessels, and nerves enter and exit the lung. While important for lung structure, it is not the area that accommodates the heart.
B. Oblique fissure: The oblique fissure separates the lobes of the lung but does not form an indentation for the heart. Its role is purely in dividing the lung into anatomical sections.
C. Base: The base of the lung rests on the diaphragm and supports the lung in the thoracic cavity. It is not shaped to accommodate the heart.
D. Cardiac notch: The cardiac notch is a concave space on the medial aspect of the left lung specifically molded to fit the heart. This indentation allows the heart to sit comfortably in the thoracic cavity without compressing the lung tissue.
E. Apex: The apex is the superior tip of the lung extending above the clavicle. It is distant from the heart and unrelated to the heart’s position in the thoracic cavity.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Negative feedback inhibition:Target organs commonly regulate the pituitary gland through negative feedback. When hormone levels rise in the blood, the target organs signal the pituitary to decrease secretion of stimulating hormones, maintaining homeostasis and preventing overproduction.
B. Up-regulation:Up-regulation refers to an increase in receptor numbers on target cells in response to low hormone levels. It affects cell sensitivity but does not directly regulate pituitary hormone secretion.
C. Positive feedback inhibition:Positive feedback amplifies responses rather than inhibiting them. This mechanism is rare in endocrine systems and is typically seen only in events like childbirth, not general pituitary regulation.
D. Antagonistic regulation:Antagonistic regulation occurs when hormones have opposite effects on target cells, but this does not describe the primary mechanism by which the pituitary is controlled by its target organs.
E. Down-regulation:Down-regulation refers to the decrease in receptor numbers on target cells in response to high hormone levels. It modulates target cell sensitivity but does not directly control pituitary hormone secretion.
Correct Answer is C
Explanation
A. Weeks:While some activated lymphocytes may only survive for a few weeks after an immune response, memory lymphocytes are designed to persist much longer to provide lasting immunity.
B. Days:Effector lymphocytes, such as short-lived plasma cells, may function for days during an active immune response. However, this does not reflect the longevity of memory lymphocytes.
C. Decades:Memory lymphocytes, particularly memory T and B cells, can survive for decades. This long lifespan allows the immune system to “remember” pathogens encountered earlier in life and respond more rapidly upon re-exposure.
D. Months:Some lymphocytes can survive for months, but this is still short compared to memory cells that provide long-term immunity over decades.
E. Years:While memory lymphocytes can survive for many years, the most accurate term emphasizing their extreme longevity is decades, capturing their ability to persist through much of a person’s lifetime.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.