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12345 [234]
3 years ago
6

Harry is driving on the interstate highway for the first time since he obtained his license. He is nervous and wants to get off

the interstate but cannot do so; his heart and pulse are racing. In this scenario, harry's physiological responses can be best attributed to his _____ nervous system. parasympathetic central sympathetic somatic
Biology
1 answer:
likoan [24]3 years ago
8 0

The correct answer is sympathetic nervous system.

In the given case, the harry is experiencing stress, which provokes the flight and fight syndrome. The sympathetic nervous system causes the release of  adrenaline and noradrenaline causing change in physiological responses. During the flight and fight response, a hyperarousal occurs, which leads to the change in physiological responses. It causes the increased heart beat, increased blood pressure, anxiety, increase in pulse, increased sweating etc.

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Select the true statements about protein secondary structure.
saul85 [17]

Answer:

C.The β‑pleated sheet is held together by hydrogen bonds between adjacent segments.

Explanation:

Hello!

The most common secondary structures are α-helix and β-sheets. The structures are defined by regular hydrogen bonds formed between the N-H and C=O groups of the amino acids that form the chain. These structures form in segments of the protein as an intermediate before it folds into the 3D tertiary structure.

<u>α helix  </u>

It is a cylindrical structure that comprehends a helical backbone, while the side chains extend outward in a helical distribution. The α-helix stabilizes through hydrogen bonds between the amines and carbonyls groups of the backbone. Each carbonyl group forms a hydrogen bond with the amine group four residues later in the main chain. Thus, except for the amino acids near the end of the α-helix, all the carbonyls and amines groups in the main chain are linked by hydrogen bonds. Each residue corresponds to a translation of 1,5Ǻ and a turn of 100º this equals 3,6 residues per turn.

From the observer point of view, if the rotation of the helix is clockwise or right-handed, it's called dextrorotation and if the rotation is counterclockwise or left-handed it's called levorotation. Dexorotation or dextrogyre is the most common rotation of α-helixes in proteins. Levorotation or levogyre is very rare but can be found in proteins with a large content of achiral glycine.

<u>β-sheets (β-pleated sheets) </u>

This structure consists of at least two β-strands (polypeptide chains), the strands conform a backbone of three to ten amino acids in an extended formation that connects laterally with hydrogen bonds. The distance between adjacent amino acids in a β-strand is approximately 3,5Ǻ in contrast to the 1,5Ǻ distance of an α helix. The chains that form a β-sheet have directionality conferred by their N-terminus and C-terminus. Adjacent β-strands can form hydrogen bonds in antiparallel, parallel or mixed arrangements. In the antiparallel arrangement, the adjacent strands are said to have opposite directions (N-C vs C-N) this allows the bonds to be established between the amines and carbonyls groups of each amino acid with the carbonyls and amines of the adjacent amino acid. This way the bonds between carbonyls and amines are planar, which allows strong interstrand stability.

In the parallel arrangement, the adjacent strands have the same direction (N-C vs N-C). In this type of arrangement, each amine forms a hydrogen bond with the carbonyl of the adjacent amino acid, but its carbonyl group forms a hydrogen bond with the amine group of the amino acid two residues later.

I hope you have a SUPER day!

6 0
3 years ago
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uysha [10]

Answer:

The prefix pro- primarily means “forward” but can also mean “for.” Some words that the prefix pro- gave rise to are promise, pro, and promote. When you, for instance, make progress, you are stepping “forward,” whereas if you give the pros in an argument, you are speaking “for” something by stating its advantages.

Explanation:

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Why is it important for agriscientists to consider the end food product of the work and science that they do?
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Explain the interaction between the central nervous system and the peripheral nervous system.
nikitadnepr [17]
The central nervous system<span> (</span>CNS<span>) is composed of the brain and the spinal cord. The </span>peripheral nervous system<span> (</span>PNS<span>) is composed of all of the </span>peripheral nerves<span>that connect all of the parts of the body with the </span>CNS<span>. List three general functions of the </span>nervous system<span>.</span>
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Vaccines help the body develop antibodies against certain diseases​
Lemur [1.5K]

Answer: Yes

Explanation: humans have successfully developed vaccines for a number of life-threatening diseases, including meningitis, tetanus, measles and wild poliovirus.

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