Answer:
Kupffer cells, also known as stellate macrophages due to their particular structure while viewed under a microscope, were first identified by scientist Karl Wilhelm von Kupffer, after whom the cells were named, in 1876.
These cells, whose origin is in the yolk sack during fetal development, later on move to the liver where they will stay and further differentiate into their mature versions.
These cells are part of the liver cells, and are found particularly on the walls of the sinusoids, where they perform their two most important tasks. First, these cells are part of the immune system, as they are essentially macrophages. However, their role is pretty unique, as they are responsible not just for phagocytosis of invading bacteria, and other pathogens, and initiating immune responses, but also, this cell plays a role in decomposing red blood cells who are dying, and taking up the hemoglobin from them to further break that into reusable globin, and the heme group, from which iron is further extracted to be re-used and also to create bilirrubin, a part of bile.
Finally, these cells have been found to be connected to hepatic cirrhosis, as in their process of detoxifying ethanol, they produce toxins that force the liver cells to produce collagen, and thus to become fibrous.
Answer:
Earth's tilt towards the sun will gradually cause the northern hemisphere to experience summer during today's current winter.
Explanation:
It is expected that over the next 13,000 years, the polar region, particularly the north pole will be tilted gradually towards the sun. At that time, the earth will be in the closest position towards the sun. The tilt would be along the axis and also orbital. Henceforth this both forms of earth's tilt towards the sun, will expose the northern hemisphere to maximum solar radiation, this will cause the region to experience summer during winter's time.
Here, the rate of infusion is 40mLs/hr.
<h3>What is Infusion?</h3>
An infusion may be defined as a process of being extracted some compounds from original products.
To find the dose required = 0.5 (mg) x patient weight (kg)
= 0.5mg x 80 = 40mg
Available Aminophylline is 500mg in 500 mLs = 1mg in a mL
To find the actual rate of infusion = 
= 
= 40mLs/hour.
Therefore, the rate of infusion is 40mLs/hr.
To learn more about Infusion, refer to the link:
brainly.com/question/17056414
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Answer:
The correct answer is e. all of the above.
Explanation:
Nurse cells are also called sertoli cells and are located in the seminiferous tubules in the testes. They provide nourishment to the growing sperms by providing nutrients from surrounding cells.
During the development of of sperms they become genetically different from other cells so nurse cells form blood testes barrier to protect them from immune cells.
Nurse cells concentrate the testosterone in seminiferous tubules which is necessary for proper development of sperms. They also secrete inhibin which stop FSH secretion from anterior pituitary therefore regulate the spermatogenesis.
