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Lyrx [107]
3 years ago
13

20. Which of the following statements are accurate?

Biology
2 answers:
kolbaska11 [484]3 years ago
8 0

Answer:

Statements A,C,D and E are correct

Statement B is wrong.

Explanation:

A. An efflux of extra potassium ion out of the cell leads to the cell being repolarized.

C. Once the threshold of depolarization reaches there much be an occurrence of action potential.

D. Depolarization of a cell at rest makes it reach it's threshold

E. Depolarization leads to the opening of the voltage-gated Na+ channels for Na+ influx.

Andreyy893 years ago
7 0
I believe the answer is B. Let me know if I’m wrong
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Help me pleaseeeee!!
DochEvi [55]

Answer:

POLLUTANT, SOURCE AND IMPACT

Carbon Monoxide

SOURCE:- carbon monoxide main sources are from our homes, eg; wood stoves and fire place, generators, gas stoves, kerosene heaters, leaking chimneys, tobacco smokes etc

IMPACT:- carbon monoxide can cause organ failure as it reduces the amount of oxygen the hemoglobin been carried in the red blood cells to this organs in our body.

Carbon dioxide

SOURCE:- carbon dioxide can be from both human and natural source. Example of the sources includes; natural source ( ocean release, decomposition and respiration), human activities ( burning of coal, oil and natural gas, cement production etc)

IMPACT:- carbon dioxide causes difficulties in breathing as it displaces oxygen in the air.

It also increase the greenhouse effect (global warming) as more heat energy gets trapped by the atmosphere causing the planet to become warmer.

Sulphur dioxide

SOURCE:- sulphur dioxide mainly occur due to human activities such as fossil fuel combustion at industrial facilities, in ships etc.

IMPACT:- Sulphur oxide has been linked to many health effect and diseases such as cardiovascular diseases. It also causes respiratory problems, asphlegm and asthma attacks, irritation of lungs, throat and nose as well.

Nitrogen oxides

SOURCES:- nitrogen oxides also comes from human activities such as; combustion of fossil fuel, making of nitric acid, refining metals as well as petrols, explosive, food manufacturing etc.

IMPACT:- Nitrogen oxides has also been linked to many respiratory health issues such as bronchitis and wheezing. It causes the lining of the lungs to inflame there by reduce the immunity of the lungs to respiratory diseases.

Methane

SOURCE:- methane can be from either natural or human activities. The natural source includes; food digestion by cattles, decay of organic materials. Human activities such as waste management, rice production, oil and gas production etc.

IMPACT:- Methane is considered a green house gas like carbon dioxide, it contributes to the trapping of heat energy in the atmosphere which causes global warming. It is also linked to serious health issues such cardiovascular, respiratory and neurological problems.

Particulates

SOURCE:- particulates are fine tiny particles of matter found in the air, it might be in solid or liquid form. Example; dust, smoke, fumes etc. This particles can suspended in the air for an extended periods of time.

IMPACT:- exposure to particulates can cause variety of respiratory health problems such as difficulties in breathing, coughing, lungs and heart problem etc.

7 0
3 years ago
Renin is made by ________.
Naddika [18.5K]

Answer:

granular cells of the juxtaglomerular apparatus

Explanation:

Renin is a secreted hormone, stored and produced by granular cells. This enzyme is responsible for regulating the water gradient in the human glass and blood pressure. This enzyme helps regulate the extracellular gradient in the blood cell plasma and controls any problems that may appear in the arteries or in all blood vessels in the body.

8 0
3 years ago
Wind power, water power (also called hydroelectricity), solar power, ethanol:
lora16 [44]
Wind power:

Advantages:

-Using wind as a source of power is very cost-effective. This is method is fuel free and the electricity harvested from wind farms is sold at a fixed price over a long period of time.

-Wind power is a clean fuel source. Using wind as a source of power prevents air pollution unlike power plants that mostly rely on fossil fuels which releases toxins into the hair causing both environmental and health problems.

-Wind power is a sustainable source of power since nothing can really stop it from being produced. Since this source of power relies on air, as long as there is air, energy can be harvested.

Disadvantages:

-Wind turbines are usually built in rural areas due to the size of them and the amount of space needed to build them. Because of this, they aren’t usually close to cities or remote locations where the energy harvested from them is most needed.

-Wind turbines can harmfully impact nature. Because of their height and size, many birds and other flying animals end up getting killed by the spinning blades connected to the turbine.

-Locations to build wind turbines may be hard to get due to competition with other things that may be of more importance on the land compared to wind farms.
4 0
3 years ago
Read 2 more answers
The atom that is most closely associated to living things is carbon or nitrogen
Dmitry [639]

the atom that is most closely associated to living things is carbon

5 0
3 years ago
Read 2 more answers
¿como dañamos alos ecosistemas?​
Nezavi [6.7K]

Answer:

We ruin the ecosystem with pollution, littering, habitat destruction, and extinction of the wildlife.

Arruinamos el ecosistema con la contaminación, la basura, la destrucción del hábitat y la extinción de la vida silvestre.

3 0
3 years ago
Read 2 more answers
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