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dimaraw [331]
3 years ago
9

An organ that does not secrete digestive enzymes is the

Biology
1 answer:
STALIN [3.7K]3 years ago
3 0
C. esophagus. it does not secrete any enzymes. its just do peristalsis. which is a rhythmic contractions and relaxations of muscles to push food along the gut
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Write a 600 word report discussing nuclear reactors. The report should include a description of the way a reactor works and the
barxatty [35]

Answer:

Explanation:

A nuclear reactor is an installation capable of initiating, maintaining and controlling the chain fission reactions that take place in the reactor core, consisting of the fuel, coolant, control elements, structural materials and moderator in the case of nuclear thermal reactors.

The core is the part of the reactor where the nuclear chain reaction is produced and maintained.

Components of the core:

The fuel of a nuclear reactor is fissionable material.

Control rod beams provide a rapid means of controlling the nuclear reaction, allowing rapid changes in reactor power and eventual shutdown in case of emergency.

The neutrons produced in fission have a high energy in the form of velocity. Their speed should be reduced to increase the probability of other atoms fissioning and not to stop the chain reaction. This is achieved by elastic collisions of the neutrons with the nuclei of the moderator.

Most of the energy released by fission is in the form of heat. To be able to use this, a refrigerant must pass through the interior of the reactor that absorbs and transports this heat.

In a nuclear chain reaction, a certain number of neutrons tend to escape from the region where it is produced. This neutron leakage can be minimized by the existence of a reflecting medium, thus increasing the efficiency of the reactor.

When the reactor is in operation, a large amount of radiation is generated. Protection is needed to isolate the installation workers from radiation caused by fission products. Therefore, a biological shield is placed around the reactor to intercept these emissions.

A breeder reactor is a nuclear reactor that generates more fissile material in the fuel than it consumes. Considered highly attractive because of their superior fuel economy: a normal reactor consumes less than 1% of the natural uranium that starts the fuel cycle, while a 'breeder' can burn it almost completely. It also generates less waste for the same amounts of energy. Breeders can be designed to use thorium, which is more abundant than uranium. Currently, there is renewed interest in both breeder designs due to the increased price of natural uranium.

All commercial reactors breed fuel, but they have low (though still significant) breeding ratios when compared to machines that are traditionally considered breeders. In recent years, the commercial energy industry has been emphasizing high burn fuels, which last longer in the core of the reactor.

Reproduction of fissile fuel is a common feature in reactors, but commercial reactors are not optimized for this feature which is referred to as improved burning. Up to one-third of all electricity produced in the current U.S. reactor inventory comes from reproducible fuel, and the industry is working hard to increase that percentage over time.

The advantages are:

Generates a large amount of electricity

No production of greenhouse gases

Dependence on oil is reduced

Less damage to the environment

A major disadvantage is the difficult management of the nuclear waste generated.

Nuclear power plants have a limited lifetime. The investment for the construction of a nuclear plant is very high.

4 0
3 years ago
PLS HELP I WILL GIVE YOU BRAINLIEST AND PLS EXPLAIN YOUR ANSWER!!!
Kipish [7]

Answer:

Most likely centripetal force. Newton's first law states that an object in motion will continue to remain in motion unless acted upon by an outside force. In this case, that outside force is the centripetal force.

Explanation:

Hope this helps :)

8 0
2 years ago
Is the pit that marks where the umbilical cord was attached before birth?
liubo4ka [24]
The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
5 0
3 years ago
A red flowered pea crossed with a white flowered pea produces all red flowered offspring. If two of the F1 pea plants were cross
MrRissso [65]

Answer:2 red

Explanation:

4 0
3 years ago
Darin wanted to make amino acids. He took the protein collagen and heated it to the point of denaturation at physiological pH. W
Svetllana [295]

Answer:

No, because he will not have broken covalent bond.

Explanation:

Denaturation  is the process adopted to affect or alter the chemical structure of a protein. This can be done or achieved by heat or addition of acid.

Denaturation can't break the peptide bond of the protein , this means that the , amino acid sequence is unaffected after the process.

Physiological pH is the pH Darin won't be able to have amino acid because the pH at which denaturation was being carried is basic, while the process requires acidic medium.

Collagen is a form of protein that can be found in the body.

8 0
3 years ago
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