Answer:
Norepinephrine
Explanation:
Nerve cells and circulating hormones are the one responsible for vasoconstriction of the vessel walls, as they do not enter the tunica media of the blood vessel, the nerves do not synapse directly on the smooth muscle cells. Instead, they release the neurotransmitter, norepinephrine, which diffuses into the media and acts on the nearby smooth muscle cells, which result in contraction of the entire muscle cell layer and thus reducing the radius of the vessel lumen.
Answer:
A useful model for enzyme action is the Lock and Key model.
Explanation:
The Lock and Key model or theory was first postulated by <u>Emil Fischer</u> in 1894. It is used to represent the enzyme and its specific substrate. The enzyme (lock) is specifically activated by the substrate (key) through its active site (key hole) to produce a catalyzed reaction. If the keys are too small or too big for the key hole, it will not produce any reaction.
The Double Helix model by Watson and Crick is used to represent the DNA present in an individual. This is made up of <u>two strands of DNA</u> bounded by hydrogen bonds. In between these bonds are nitrogenous bases <u>adenine (A), guanine (G), thymine (T), and cytosine (C).</u>
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The Ball and Socket model represents body joints, specifically the hip and the shoulder joints. The shape of the <u>head of the joint is spherical</u> and <u>fits into a cup-like depression of the receiving bone</u>. The <u>range of motion </u>of this joint is usually <u>wide</u> and has <u>one central point</u>.
The Amino Acid Chain model, also known as polypeptides, are linked together by a <u>peptide bond</u>. A peptide bond is produced by hydrolysis. The chain usually <u>starts with the amino group and ends with the carboxyl group</u>.
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Carbon makes four electrons available to form covalent chemical bonds, allowing carbon atoms to form multiple stable bonds with other small atoms, including hydrogen, oxygen, and nitrogen. This allows carbon atoms to form a tremendous variety of very large and complex molecules.
Ask farmers in the location to help in mining bauxite
This will give the farmers a source of income; whereas, the other options do not give benefit to either the mining company of the farmers. Only one side profits in the remaining situation.
