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oksano4ka [1.4K]
3 years ago
7

How does a human end up with an extra chromosome?

Biology
1 answer:
Burka [1]3 years ago
8 0

Answer:

It’s a change in gentic cells, or are missing extra chromosomes

Explanation:

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What moves across axons
dexar [7]

Answer:

When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron.

Explanation:

Thats all i could think of

8 0
3 years ago
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Use the normal ecg trace below to determine how many seconds the trace represents as well as the heart rate.
mezya [45]
Attached is the image of the concerned ECG reading.

In reading the ECG, first you read the heart rate. To read the heart rate, you must count for the number of small boxes in between QRS complexes, specifically R-R intervals. These number of small boxes will then be used to divide 1500. In this example, there are 20 small boxes between R-R intervals. 1500 divided by 20 is 75, so the heart rate of this ECG reading is 75 beats per minute. 

<em>Another way, albeit less accurate, is to count the big squares between R-R intervals and instead of dividing it by 1500, you divide it by 300.</em>

3 0
3 years ago
Increasing the volume of air that reaches the alveoli and takes part in gas exchange will cause blood pH to:
Karolina [17]

Answer:

B. increase, because the partial pressure of CO2 in the blood will decrease.

Explanation:

The presence of carbon dioxide gas in blood imparts H+ ions due to its reaction with H2O and thereby, lowers down the blood pH.

When more air reaches alveoli, the rate of gaseous exchange is increased. More of the carbon dioxide is removed from the blood and is released out of the body via exhalation.

Removal of carbon dioxide from blood would increase the pH of the blood since the partial pressure of CO2 in the blood would decrease.

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3 years ago
What happens to the DNA in cell during interphase?
UkoKoshka [18]

Answer:

The cell copies its DNA

Explanation:

3 0
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A star turns matter into energy in the process of ?<br> nuclear fusion
aleksandr82 [10.1K]
You are correct the answer is nuclear fusion
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3 years ago
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