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natka813 [3]
3 years ago
13

F. Answer the following questions in brief.

Biology
1 answer:
fgiga [73]3 years ago
8 0

1. fossil fuels should be used judiciously as they can be exhausted if used excessively and will take time to replenish

2. fossil fuels are fuel formed by natural processes such as decomposition of dead organisms .

3. They can be easily exhausted

4.The calorific value of a fuel is the quantity of heat produced by its combustion i.e at constant pressure and under “normal” (standard) conditions (i.e. to 0 degree C and under a pressure of 1,013 mbar).

5. COMPRESSED NATURAL GAS . CNG preferred than fossil fuel because it produce greenhouse gases upon combustion, it is a more environmentally clean alternative to other fossil fuels

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Describe the flow of blood in the human body, including through each of the four chambers of the heart.
sesenic [268]
Well , the humans have a closed double circulatory system as the blood passes by the heart twice per one cycle and doesn't leave the blood vessels like in insects.
》Pulmonary circulation : Blood is circulated to the lungs where it is oxygenated.
》Systemic circulation : Blood is circulated through all the other parts of the body where it unloads oxygen.

Oxygenated blood coming from the lungs enters the heart through the pulmonary vein which takes blood to the first chamber it meets ; the Left atrium. Left atrium pumps blood to the second chamber , which is left ventricle and during this time , the semi lunar valves are closed to prevent back flow of blood and the bicuspid valve will be open . Now , the left ventricle is filled with oxygenated blood so it will pump this blood to the whole body via the largest artery which is Aorta.
Oxygenated blood will unload oxygen to cells in need of it and will return back now to the heart as deoxygenated . This deoxygenated blood will enter the heart through superior and inferior vena cava which will take the blood to the third chamber , right atrium . Right atrium will pump blood to right ventricle so the semi lunar valves will be closed during this time and the tricuspid will remain open. Now that the fourth chamber is filled with deoxygenated blood , it will pump this blood through pulmonary artery when the semi lunar valves opens , to the lungs again to be oxygenated once more.


Notice that you have to know exactly the position of the valves that I have mentioned in the heart so that you could understand the blood flow better. You can refer to any heart labelled diagrams in your textbook or the internet.
4 0
3 years ago
Muscle cells serve as a reservoir for which of the following?
babunello [35]
B. O Glucose

explain:

Muscle is a primary site for glucose uptake and storage
8 0
2 years ago
3. The enzyme DNA polymerase works only in the 5' to 3' direction. How does this affect the leading strand and the lagging stran
saul85 [17]

Answer: C

Explanation:

4 0
3 years ago
Read 2 more answers
"The three types of unemployment are A. ​full, frictional, and involuntary unemployment. B. ​natural, unnatural, and cyclical un
Kruka [31]

Answer:

D. ​frictional, structural, and cyclical unemploment.

Explanation:

Types of Unemployment

There are three basic types of unemployment which are the cyclical, frictional, and structural.

Cyclical Unemployment

Is due to the highs and lows of the economy, as in cycles e.g in times of recession, the job lost is know as cyclical unemployment.

Frictional Unemployment

It results from the actual turnover in the labor market and the time taken to get a new job. E.g. when a worker change his/her job, it requires time to get a name job and learn more of the job in details for him/her to be called up for interview and get hired. This process is termed frictionally unemployed.

Structural Unemployment

Originates from a lack for demand for a specific class of worker due to the worker lacking the appropriate skills needed by the employee as this can cause the worker to lose the job. Another example is sourcing for a reduced cost of labour abroad.

5 0
3 years ago
Whats the difference between freshwater and saltwater?
Annette [7]
Freshwater does not contain any salt, salt water does however contain salt.
6 0
3 years ago
Read 2 more answers
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