What are Neurosecretory Cells? Q4. What are Nissle’s granules? Q5. An insulating material that surrounds some axons is called? Q6. What are the important properties of voluntary muscles? Q7. Is an involuntary muscle that is striated in appearance? PLS ANSWER AS SOON AS POSSIBLE
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Magnocellular neurosecretory cells are large neuroendocrine cells within the supraoptic nucleus and paraventricular nucleus of the hypothalamus. They are also found in smaller numbers in accessory cell groups between these two nuclei, the largest one being the nucleus circularis.
4. A Nissl body, also known as Nissl substance and Nissl material, is a large granular body found in neurons. These granules are of rough endoplasmic reticulum (RER) with rosettes of free ribosomes, and are the site of protein synthesis.
5.Myelin is a lipid-rich (fatty) substance that surrounds nerve cell axons (the nervous system's "wires") to insulate them and increase the rate at which electrical impulses (called action potentials) are passed along the axon.
6.Voluntary muscles or striated muscles are those which work according to the one’s desire or are under control, whereas Involuntary muscles are not under one’s control. Biceps muscles, respiratory, alimentary and urogenital tracts are the places where voluntary muscles are found, while abdominal muscles, locomotory muscles, middle ear muscles, Diaphragm are the examples of the involuntary muscles.
Locomotion and movement are the main features of the organisms, whether it is unicellular or multicellular. For this action, there is the particular type of tissues known as muscular tissue, and the cells are referred to as the muscle cell. These muscular tissues are formed from the embryonic mesoderm. These tissues are coordinately working with one another and thus support the movements of the body, and its various parts.
7.Skeletal muscles are long and cylindrical in appearance; when viewed under a microscope, skeletal muscle tissue has a striped or striated appearance. ... Like skeletal muscle, cardiac muscle is striated, but unlike skeletal muscle, cardiac muscle cannot be consciously controlled and is called involuntary muscle.
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