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77julia77 [94]
2 years ago
6

1. Write the function of valves in veins .

Biology
1 answer:
zheka24 [161]2 years ago
4 0

Answer:

1.

•After the left ventricle contracts, the aortic valve closes and the mitral valve opens, to allow blood to flow from the left atrium into the left ventricle.

•As the left atrium contracts, more blood flows into the left ventricle.

•When the left ventricle contracts again, the mitral valve closes and the aortic valve opens, so blood flows into the aorta.

2.

•Diffusion is defined as the movement of individual molecules of a substance through a semipermeable barrier from an area of higher concentration to an area of lower concentration.

Explanation:

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bezimeni [28]

Answer:

A RNA polymerase separates the hydrogen bases of a gene to produce a strand of messenger RNA, which leaves to nucleus. When a ribosome attaches itself to the messenger RNA, it reads the RNA 3 bases at a time to build amino acids which are then folded into proteins.

More explained process:

Note: The description below will explain the process of “protein synthesis”, in which the mRNA (messenger RNA) takes part of.

In the process of protein synthesis, the first step is called “transcription”. In transcription, the mRNA (messenger RNA) unwinds DNA base pairs, and pairs it with the single strand of RNA (A,U,C,&G) . Then the mRNA moves out of the nucleus and into the cytoplasm to ribosome. That process is called “translation”. In translation, there is a molecule called tRNA (transfer RNA). There is an amino acid which corresponds to the base pairs of RNA in top, which will create a chain of amino acids. [ For example, the bases are AUC, the corresponding amino acid will be isoleucine (Ile). Next, the tRNA molecules carry the amino acids to mRNA, reads the RNA 3 bases at a time to build an amino acid chain which are then folded into proteins.

5 0
3 years ago
Describe the flow of blood in the human body, including each chamber of the heart. Explain how the blood changes as it moves thr
Mama L [17]
<span>    How does pulmonary circulation work? In my example below, we will start with the blood not reaching the heart yet. The heart beats around 75 beats a minute. Deoxygenated blood is in the veins, going to the heart. Note that veins will always carry deoxygenated blood, excluding the pulmonary veins. The deoxygenated blood goes into the heart through the superior or inferior vena cava, and goes into the right atrium. It then gets pumped into the right ventricle, and gets pumped through the pulmonary arteries to the lungs to get oxygenated. The blood, now oxygenated, comes back to the heart through the pulmonary veins, into the left atrium. The blood gets pumped from the left atrium to the left ventricle, where it gets pumped through the aorta to all of the body systems. The red blood cells travel through capillaries, which is where most  of the gas exchange occurs between body cells and red blood cells. Red blood cells have no nuclei. When the red blood cells are no longer red, but blue due to lack of oxygen, they go back to the heart to get pumped to the lungs, and enter the heart through the superior or inferior vena cava. The cycle starts over. Just like the veins, arteries always carry oxygenated blood, excluding the pulmonary arteries. Also, the right side of the heart will have deoxygenated blood, or blue blood, and the left side of the heart will have oxygenated blood. </span> 
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4 years ago
How do metamorphic rocks work?
insens350 [35]

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Explanation:

8 0
3 years ago
Plants produce carbon dioxide as a product of cellular respiration. But you know that plants release oxygen, not carbon dioxide.
77julia77 [94]
Carbon dioxide is released during respiration but used up during photosynthesis. The reason that plants release oxygen is because the amount of carbon dioxide released by the plants is, for the most part, used in photosynthesis; however, all of the oxygen produced is not used in respiration. Thus, the net outflow of gas from a plant is that of oxygen.
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3 years ago
Plz help me well mark brainliest if correct!!!
Mnenie [13.5K]
A, just like his last name
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