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elixir [45]
2 years ago
14

What prevents the blood in veins from flowing in the wrong direction?.

Biology
1 answer:
torisob [31]2 years ago
7 0

Answer:

The heart valves

Explanation:

The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.

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Nebula - protostar - main sequence star. The hydrogen gas in the nebula is pulled together by gravity and it begins to spin and
andrezito [222]

Answer:

The mass of a star determines its life cycle, that is, more the mass, shorter will be its life cycle. The mass of the star is determined by the concentration of matter, which is found within its nebula. In the nebula, with time, the hydrogen gas comes in close proximity with each other due to gravity and starts to spin.  

With the brisk spinning, the gas heats up and turns into a protostar. The temperature now reaches 15,000,000 degrees and within the core of the cloud, the phenomenon of nuclear fusion takes place. The cloud now contracts a little, starts to glow brightly, and turns stable. The cloud now becomes a prime sequence star, and will stay in this phase for millions of years, the Sun of our galaxy is in this stage at the moment.  

8 0
4 years ago
The technique psychologists use to measure electrical activity in the brain is 1. EEG 2. Lesion 3. FMri 4. CAT Scan 5. PET Scan
posledela

Answer:

The correct answer is 1. EEG.

EEG or electroencephalography is a technique used to measure the electrical activity of the brain.

8 to 16 pairs of electrodes are placed on the scalp which record the electrical activity or impulses (in volts) generated by thousands of neurons or nerve cells present in the brain.

It provides the real-time imaging of the electrical activity of the brain.

The recorded impulses are first sent to the amplifier as the magnitude of the brain's electrical impulses is very low.

The amplifier then amplifies the results and show it on the screen in the form of voltage units.

4 0
3 years ago
Do buffalo compete for food with other herbivores? If so, for what food and when?
irakobra [83]

Answer:

Sure grass.  And there is a lot of grass. Compete with wild horses, wild pigs, wild goats, wild "golfer's who are way off the fairway. Wild deer are in the forests, wild goats in the hills so buffalo and horses manage the plains and the back nine.  So much grass there was no competition...with the wild rabbits.  Grass continues to grow.  The buffalo move to greener pastures once they mowed down the other fields.  When there were Millions of them, they were not starving.

Explanation: Got this from somewhere hoping it helps!

5 0
3 years ago
Read 2 more answers
How does the structure of Tim O'Brien's story "Ambush" relate to its title?
Nataly [62]

The correct answer is option C, The narrator's platoon was surrounded by the enemy, similar to the way the narrator feels when he is surrounded by his family

Reason -

In the story by Tim O’Brien’s, It is clear that the narrator is puzzled at two instances and at these two instances the word "Ambush" relate to its title The two instances are given below:

a) The first instance is when the narrator’s daughter is asking him question about his war time memories. The narrator feels guilty when he lied to his daughter in order to be a hero in front of her but somewhere he was aware that he was lying.  

b) The second instance is when the narrator threw a bomb and killed a soldier of another nation. He is guilty about killing anyone during wartime.  

4 0
3 years ago
Select all that apply. Which of the following components of air help to trap infrared energy? nitrogen oxygen carbon dioxide wat
IRINA_888 [86]

Carbon dioxide and water are components of air help to trap infrared energy.


Explanation:

The atmosphere of the planet acts in a {very} very similar thanks to a greenhouse. daylight penetrates the clear air and causes the bottom to heat.


The atmosphere then acts as a blanket, keeping the heat of the planet from escaping back to the area. This result is thanks to bound gases within the atmosphere that are superb at gripping and re-radiating the warmth energy before it's lost to the area.

These gases, referred to as "greenhouse gases", embrace greenhouse emission, water vapor, and paraffin.

6 0
3 years ago
Read 2 more answers
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