Biology

Auditory Cortex

Auditory Cortex

Auditory Cortex Definition Auditory cortex is the section of the brain that processes information received through hearing. It is also called auditory area. It is located bilaterally, roughly at the upper sides of the temporal lobes – in humans on the superior temporal plane, within the lateral.....

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Lateral Sulcus

Lateral Sulcus

Lateral Sulcus Definition Lateral sulcus is one of the group of sulci and a most prominent brain section. It first arises around the 14th gestational week and originates earlier than all the other structures of the human brain. It is also called Sylvian fissure or lateral fissure. It is the name .....

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Prefrontal Cortex

Prefrontal Cortex

Prefrontal Cortex Definition Prefrontal cortex (PFC) is the cerebral cortex which covers the front part of the frontal lobe. It is often called the ‘brain center’ because it takes in information through senses, like touch and sight, and processes it to make decisions about reactions a.....

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Cell Envelope

Cell Envelope

Cell Envelope Definition Cell envelope is a combination of the cell membrane, cell wall, and an outer membrane if it is present. Usually, this envelope is a characteristic of prokaryotes like bacteria. Most bacterial cell envelopes fall into two major categories: a gram-positive type and a gram-n.....

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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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