Explain how an NK cell would destroy a cancer cell. Identify the portion of the NK cell that plays a key role in this abnormal-cell destruction
What will be an ideal response?
Step 1: A cell may have unusual components in its plasma membrane and the NK cell recognizes that cell as abnormal. This recognition activates the NK cell, which then adheres to its target cell. Step 2: The Golgi apparatus moves around the nucleus until the maturing face points directly toward the abnormal cell. A flood of secretory vesicles is then produced at the Golgi apparatus. These vesicles, which contain proteins called perforins, travel through the cytoplasm toward the cell surface. Step 3: The perforins are released at the cell surface by exocytosis and diffuse across the narrow gap separating the NK cell from its target. Step 4: As a result of the pores made by perforin molecules, the target cell can no longer maintain its internal environment, and it quickly disintegrates.
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The _______ mesenteric ganglion receives preganglionic sympathetic neurons from the T10-T12 segments of the spinal cord
Fill in the blank with correct word.
The enzyme in the synaptic cleft partly responsible for shutting down a muscle contraction is
A) actinase. B) myosinase. C) calmodulin. D) epinephrinase. E) acetylcholinesterase.
Olfaction and hearing are processed in the __________
Fill in the blank(s) with the appropriate word(s).
A substance used to calculate plasma clearance must
A. pass freely through the filtration membrane of the renal corpuscle. B. be readily reabsorbed. C. be either a protein or a polysaccharide. D. be secreted into the nephron. E. be produced in the kidney.