Atria are often called
The Correct Answer is {"dropdown-group-1":"D"}
A. Pumping chambers: This term refers to the ventricles, which possess thick, muscular walls designed to generate high hydrostatic pressure to propel blood through the pulmonary and systemic circuits. While the atria do contract to facilitate the final stage of ventricular filling, their primary physiological role is not high-pressure pumping.
B. Venous chambers: Although the atria directly receive blood from the systemic and pulmonary venous systems, they are not anatomically or physiologically classified as "venous chambers." This term is medically inaccurate because the atria are distinct cardiac structures with unique electrical and mechanical properties.
C. Deoxygenated chambers: While the right atrium receives deoxygenated blood from the venae cavae, the left atrium receives highly oxygenated blood from the pulmonary veins; thus, labeling both as "deoxygenated" ignores the fundamental respiratory function of the left side of the heart.
D. Receiving chambers: The atria are physiologically defined as receiving chambers because they serve as the primary reservoirs that collect blood returning to the heart from the systemic and pulmonary circulations. Their thin-walled structure is optimized for low-pressure volume collection, allowing them to efficiently channel blood into the ventricles during diastole.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. (Serratus Anterior): This muscle is located on the lateral aspect of the thorax and is characterized by its saw-toothed or "serrated" appearance as it originates from the upper eight or nine ribs. It acts to protract and stabilize the scapula against the thoracic wall and is often referred to as the "boxer's muscle" due to its role in forward-reaching and punching.
B. (Linea Alba): This is a tough, fibrous band of connective tissue that runs down the midline of the abdomen from the xiphoid process to the pubic symphysis. It is formed by the fusion of the aponeuroses of the abdominal muscles and serves as a stable insertion point, but it is a non-contractile ligamentous structure rather than a skeletal muscle.
C. (Rectus Abdominis): This is the long, flat muscle that extends vertically along the entire length of the anterior abdominal wall. It is divided by transverse tendinous intersections and functions primarily to flex the lumbar spine and compress the abdominal viscera during activities like forced expiration or defecation.
D. (Internal Oblique): The internal oblique is a broad, flat muscle of the anterolateral abdominal wall, located deep to the external oblique and superficial to the transversus abdominis. This muscle assists with trunk rotation, lateral flexion, and flexion of the vertebral column.
E. (Aponeurosis of External Oblique/Inguinal Ligament): This represents the broad, flat tendon of the external oblique muscle as it approaches the midline and the pubic region. It forms the anterior wall of the inguinal canal and the inguinal ligament, providing a strong structural floor for the lower abdomen.
Correct Answer is E
Explanation
A. Cervical sympathetic trunk: This is the superior portion of the sympathetic trunk in the cervical or upper thoracic region, far from the pelvic cavity. It provides sympathetic innervation to the head, neck, and upper thoracic viscera, such as the heart and lungs, through the cervical and superior thoracic paravertebral ganglia.
B. Thoracic sympathetic trunk: The thoracic sympathetic trunk runs parallel to the vertebral column within the chest cavity and gives rise to the splanchnic nerves. These nerves primarily target the prevertebral ganglia in the abdomen to regulate the function of the foregut and midgut, rather than descending into the true pelvis.
C. Lumbar sympathetic trunk: The lumbar sympathetic trunk is situated along the lumbar vertebrae and responsible for providing postganglionic fibers to the lower abdominal region and lower extremities. While it is continuous with the pelvic portion, it is anatomically distinct and superior to the sacral/pelvic region of the autonomic chain.
D. Abdominal prevertebral plexus: This points to the abdominal prevertebral plexus (specifically near the aortic bifurcation), which integrates both sympathetic and parasympathetic fibers. While these plexuses contribute to the pelvic viscera, they are located anterior to the great vessels and do not constitute the paravertebral "trunk" or chain itself.
E. Pelvic (sacral) sympathetic trunk: This identifies the pelvic (sacral) sympathetic trunk, which consists of the paravertebral ganglia located medial to the sacral foramina. These ganglia represent the terminal inferior portion of the sympathetic chain, where the two trunks converge at the coccyx to form the ganglion impar, providing sympathetic outflow to the pelvic organs and perineum.
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