Biology

Lipid Bilayer

Lipid Bilayer

Lipid Bilayer Definition Lipid bilayer is a two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward. Each lipid molecule comprises a hydrophilic ‘head’ (having a high affinit.....

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Acetylcholine

Acetylcholine

Acetylcholine Definition Acetylcholine is a substance that is released at the junction between neurons and skeletal muscle fibers, at the nerve endings of the parasympathetic nervous system, and across synapses in the central nervous system, where it acts as a neurotransmitter. Acetylcholine is t.....

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Lipids Srtucture, Properties and Function

Lipids Srtucture, Properties and Function

Lipids Srtucture, Properties and Function Lipid – Lipids are biological molecules that are insoluble in water, but are soluble in non-polar solvents, meaning that they are non-polar molecules. It comprises a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble v.....

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About Lipid

About Lipid

About Lipid Definition Lipids are any of a large group of organic compounds that are oily to the touch and insoluble in water. Lipids include fatty acids, oils, waxes, sterols, and triglycerides. They are a source of stored energy and are a component of cell membranes. The word lipid stems etymol.....

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Goblet cell

Goblet cell

Goblet Cell Definition Goblet cells are any of the specialized epithelial cells, such as those found in the mucous membrane of the stomach, intestines, and respiratory passages, that secrete mucus. The goblet cells distend with mucin before secretion and collapse to a goblet shape after secretion.....

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Plastid

Plastid

Plastid Definition Plastid is an organelle found in the cells of plants, green algae, red algae, and certain other protists. Like mitochondria, plastids have an inner and outer membrane, and contain their own DNA and ribosomes. Some plastids, such as the chloroplasts in plant leaves, contain pigm.....

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About Neurotransmitter

About Neurotransmitter

Neurotransmitter Definition Neurotransmitter is a chemical substance that is produced and secreted by a neuron and then diffuses across a synapse to cause excitation or inhibition of another neuron. Acetylcholine, norepinephrine, dopamine, and serotonin are examples of neurotransmitters. It is al.....

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Histamine

Histamine

Histamine Definition Histamine is an organic compound found widely in animals and plants that in humans and other mammals is released as part of the body’s immune response, causing physiological changes including dilation of the blood vessels, contraction of smooth muscle as in the airways,.....

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Gastric Glands

Gastric Glands

Gastric Glands Definition Gastric gland is the basic secretory unit of the stomach and contains a variety of component cells located in characteristic locations. It is also called fundus gland, gastric follicle. It is any of the branched tubular glands in the mucosa of the fundus and body of the .....

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Salivary Gland

Salivary Gland

Salivary Gland Definition Salivary gland is a gland in terrestrial animals that secretes saliva. In humans, three pairs of large glands, which include the parotid glands, secrete saliva into the mouth. It is also known as ptyalin. It also helps break down carbohydrates and lubricates the passage .....

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Gallbladder

Gallbladder

Gallbladder Definition Gallbladder is a small, pear-shaped muscular sac in most vertebrates in which bile is stored. The gallbladder is located beneath the liver and secretes bile into the duodenum of the small intestine. In humans, it lies beneath the liver, although the structure and position o.....

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Basement Membrane

Basement Membrane

Basement Membrane Definition Basement membrane is a thin, delicate layer of connective tissue underlying the epithelium of many organs. It is also called basilemma. Basement membranes (BMs) are present in every tissue of the human body. All epithelium and endothelium is in direct association with.....

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