সাধারন বিজ্ঞান - Read Mode
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Explanation
Necator americanus (hookworm) attaches to the intestinal mucosa and feeds on blood, causing chronic blood loss and leading to iron deficiency anemia, especially in heavy infestations.
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Neuroglia (glial cells) are the non-neuronal cells in the nervous system that provide support and protection for neurons. They maintain homeostasis, form myelin, and provide support for transmission.
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Basal cell carcinoma (BCC) is a locally invasive skin cancer that very rarely metastasizes (spreads to other parts of the body). It is the most common form of skin cancer.
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Under normal conditions, glucose is completely filtered by the glomerulus and then 100% reabsorbed in the proximal tubules. Therefore, no glucose appears in urine, making its clearance 0 ml/min.
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Oxytocin causes the contraction of myoepithelial cells surrounding the alveoli of the mammary glands, leading to milk ejection or the 'let-down' reflex during breastfeeding.
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The left lung usually has 2 lobes (superior and inferior) separated by an oblique fissure. The right lung has 3 lobes. Therefore, the statement that the left lung is divided into 3 lobes is false.
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Vitamin B12 is absorbed in the terminal ileum. It requires the presence of Intrinsic Factor (secreted by the stomach) to form a complex that can be recognized and absorbed by ileal receptors.
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Mitochondria generate ATP through oxidative phosphorylation, which involves the electron transport chain pumping protons to create a gradient. Thus, 'Proton pump operation' is a key function.
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CA 19-9 (Carbohydrate Antigen 19-9) is a tumor marker used primarily in the management of pancreatic cancer. It can also be elevated in other cancers like colorectal and bile duct cancer.
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A late normoblast (orthochromatic erythroblast) contains a significant amount of hemoglobin, approximately 30 picograms (pg), which is close to the content of a mature red blood cell.