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vladimir1956 [14]
3 years ago
12

What is the purpose of the umbilical cord

Biology
1 answer:
telo118 [61]3 years ago
8 0
The umbilical cord carries oxygenated blood and nutrients and waste to the in and out of the placenta
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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
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In which biome would you find the main types of plant life to be grasses and no wood plants
seraphim [82]
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What is the ratio of surface area to volume for a sphere with the following
Leya [2.2K]

Answer:

0.4\ \frac{1}{m}

Explanation:

Let

x ----> the surface area of a sphere

y ---> the volume of a sphere

we know that

The ratio of surface area to volume of a sphere is equal to divide the surface area by the volume of the sphere

\frac{x}{y}

we have

x=588\ m^2\\y=1,372\ m^3

substitute the values

\frac{588}{1,372}=0.4\ \frac{1}{m}

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Answer:

3.8 if that what it says

Explanation:

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What happens when a new data call current scientific explanation into question
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<span>When new data calls current scientific explanation into question scientists must repeat the experiments to verify results and reevaluate said scientific explanations, if necessary, based on results, then scientists can develop a new hypothesis and test that.</span>
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