Larger veins have valves to aid in the unidirectional flow of blood toward the heart.
True
False
The Correct Answer is A
Correct answer: True
Larger veins, particularly in the extremities, contain valves that prevent the backflow of blood and ensure unidirectional movement toward the heart. These valves are necessary because venous blood is often moving against gravity, especially from the legs and lower body. The combination of venous valves and the skeletal muscle pump, where contracting muscles compress veins, facilitates venous return. Without these valves, blood could pool in the lower extremities, leading to venous insufficiency, edema, and varicose veins.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Correct answer: False
Antidiuretic hormone (ADH), also known as vasopressin, is not released by the kidneys; it is produced by the hypothalamus and stored and released from the posterior pituitary gland. ADH acts on the kidneys’ collecting ducts to increase water reabsorption, which helps retain water, concentrate the urine, and expand intravascular fluid volume. Its release is triggered by increased plasma osmolality or decreased blood volume, allowing the body to maintain fluid balance and blood pressure.
Correct Answer is {"dropdown-group-1":"A","dropdown-group-2":"B","dropdown-group-3":"C","dropdown-group-4":"D"}
Explanation
Answer:
G: Left adrenal vein
I: Left ascending lumbar vein
F: Left inferior phrenic vein
B: Inferior vena cava
A. G (Left adrenal vein): The left adrenal (suprarenal) vein drains venous blood from the left adrenal gland. It is a short vein that empties directly into the left renal vein rather than the inferior vena cava. It is located posterior to the pancreas and near the superior pole of the left kidney, facilitating drainage of adrenal hormones into systemic circulation.
B. I (Left ascending lumbar vein): The left ascending lumbar vein is a paired longitudinal vein that runs along the posterior abdominal wall, lateral to the vertebral bodies. It communicates with the lumbar veins and the azygos/hemiazygos system. It ultimately drains into the left renal vein or directly into the inferior vena cava, providing collateral venous pathways between the lower body and thoracic veins.
C. F (Left inferior phrenic vein): The left inferior phrenic vein drains blood from the inferior surface of the diaphragm. It usually empties into the left renal vein or directly into the inferior vena cava. This vein plays a role in venous return from the diaphragm and contributes to the collateral venous network between abdominal and thoracic veins.
D. B (Inferior vena cava): The inferior vena cava (IVC) is the largest vein in the body, returning deoxygenated blood from the lower extremities, pelvis, and abdomen to the right atrium of the heart. It is formed by the union of the left and right common iliac veins at the level of L5, ascends retroperitoneally to the right of the abdominal aorta, and receives tributaries including renal, hepatic, phrenic, and lumbar veins.
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