Answer:
Explanation:
Nicotine is a type of stimulant that is chemically alkaloid. It works as the receptor agonist at the nicotinic acetylcholine receptor. It is a type of addictive chemical that increases the blood flow, heart rate and some biochemical reactions of the body. In the brain, it has stimulation as well as blocking effect. Medically, it is used for various purposes such as quitting smoking and some other.
Nicotine stimulates and then blocks cholinergic receptors in the brain, leading to both stimulating and relaxing effects.
Nicotine acts in the brain by first stimulating and then blocking cholinergic receptors. It first acts as a stimulant, increasing the release of acetylcholine, which causes excitatory effects in the brain. Eventually, the cholinergic receptors become desensitized and eventually blocked, leading to a reduction in acetylcholine's activity. This process helps explain why tobacco usage can both stimulate and relax users. When nicotine binds to these receptors, it activates them, leading to the release of dopamine and other neurotransmitters, producing pleasurable effects.
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Answer:
Its 0.075
Explanation:
Answer:
liquid, with an average density of approximately 11 g/cm3
Explanation:
The outer core of the Earth is inferred to be a liquid layer composed of iron, nickel, and sulfur, compressed to a high density. It's responsible for generating Earth's magnetic field due to the circulation of the liquid metal inside. Notably, its diameter makes it larger than the planet Mercury.
The outer core of Earth is inferred to be a dense, metallic layer, over 2900 kilometers beneath the Earth's surface. It's chiefly composed of iron, nickel, and sulfur, compressed to a very high density. Quite fascinatingly, the outer core, unlike the solid inner core, is liquid.
This liquid state facilitates the circulation of metallic elements within it, helping generate Earth's magnetic field. As the liquid metal inside Earth moves, it sets up a circulating electric current, which subsequently produces a magnetic field.
For size perspective, it's worth noting that with a diameter of approximately 7000 kilometers, Earth's core is larger than the planet Mercury. This fascinating core, and particularly its outer liquid layer, provides key insights into understanding not only earth's geodynamic movements but also the formation of its protective magnetosphere.
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B. A plasmid
C. A genetic marker
D. A restriction enzyme
Rough ER is connected to the nuclear membrane and to smooth ER.
It is a membranous organelle that is a part endo-membrane system in the cell. It is connected to the nuclear membrane and arises as flattened projections. These organelles are attached to ribosomes and therefore, called rough.
The rough endoplasmic reticulum has many folds that are connected to smooth endoplasmic reticulum as these lack ribosomes on its surface.
Learn more about Smooth endoplasmic reticulum: