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2 years ago

During the t wave of the electrocardiogram, the ventricles are electrically and functionally

1 answer:

5 0

During the t wave of the electrocardiogram, the ventricles are electrically repolarizing and functionally relaxing.

The T Wave shows ventricular repolarization when the ventricles relax after contracting and depolarizing. The ST segment shows the period between ventricular depolarization and repolarization, which is the space (a flat or slightly upcurved line) between the S wave and the T wave.

Although absent or downward sloping ST segments may suggest myocardial ischemia, a raised ST segment is the typical sign of myocardial infarctions. The U wave, which denotes the repolarization of the Purkinje fibres, comes after the T wave.

Because it is a relatively little wave in relation to the others, it does not usually appear on an ECG.

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small group of 100 people decide to isolate themselves from the world and move to a small and remote deserted island. Out of thi

irina [24]

Answer:

Frequency of p $= 0.684$

Frequency of p $= 0.316$

Number of individuals with homozygous dominant (AA) $= 47$

Number of individuals with heterozygous (Aa) $= 43$

Number of individuals with homozygous recessive (aa) $= 10$

Explanation:

Out of 100 people, 10 have albino skin (aa)

So, the frequency of homozygous recessive individuals $(q^{2})$ is $\frac{10}{100} = 0.1$

Now, q will be

$= \sqrt{q^{2} } = \sqrt{0.1} \\= 0.316$

As per Hardy Weinberg's equation -

$p + q = 1$

Substituting the value of q in above equation, we get -

$p + 0.316 = 1p = 1 -0.316\\p = 0.684$

Now the frequency of homozygous dominant (AA) will be

$p^{2} = 0.684^{2} \\= 0.467$

Hence, out of 100 people $0.467 * 100 = 46.7 or 47$ people are homozygous dominant (AA)

Like wise out of 100 people $0.1 * 100 = 10$ people are homozygous recessive (aa)

As per As per Hardy Weinberg's equation-

$p^{2} + q^{2} + 2pq = 1\\$

Substituting the values in above equation, we get -

$0.467 + 0.316 + 2pq = 1\\2pq = 1 -( 0.467+ 0.1)\\2pq = 0.433$

So, out of 100 people $0.433 * 100 = 43.3 or 43$ people are heterozygous (Aa)

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3 years ago

What passes through a cell using passive transport?

Tanzania [10]

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3 years ago

Identify some abiotic characteristics of the California chaparral ecosystem. (Site 1)

Phantasy [73]

By definition, a chaparral ecosystem is mostly located in the south of the United States wherein it mainly comprises the mountain ranges of Sierra Nevada. In addition to that, biotic characteristics of these chaparrals include having abiotic factos such as wet winters and dry summers that sometimes cause wildfires.

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3 years ago

Read 2 more answers

Your roommate, who has not studied climate, says, "I thought the greenhouse effect was a bad thing. Isn't it what's causing glob

Masja [62]

Answer:

b) and c)

Explanation:

Greenhouse gases are gases found in the atmosphere that absorb infrared radiation and trap the sun’s heat, thereby producing an effect known as greenhouse effect. By this natural way, the earth is able to be kept warm at an optimal temperature, to make it habitable for humans and other organisms. These gases referred to as greenhouse gases include, carbon dioxide, methane, water vapour and other trace gases found in the atmosphere. Greenhouse gases could be likened to the glass in a greenhouse that helps in trapping heat to keep the greenhouse warm at optimal temperature necessary for plant growth and development.

Without this natural greenhouse effect caused by greenhouse gases, life on earth would be almost impossible as the earth would almost be covered with ice below 0 degrees Fahrenheit.

The increased level of greenhouse gases we now find in the earth’s atmosphere is responsible for the additional warming of the earth’s surface, causing an enhanced greenhouse effect which results in global warming.

Statement a) cannot be used as an explanation because it is false. Greenhouse effect makes the earth habitable.

Statement d) cannot be used as an explanation because carbon dioxide is not the only greenhouse gas that matters. Water vapour, CFC and methane also have impacts.

Statement b) and c) are the best statements to use in explaining the true nature of greenhouse effect.

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3 years ago

At which stage of respiration does the co2 release take place?

LenKa [72]

The process by which most living cells generate energy during the process of aerobic respiration. CO2 release takes place at the stage of krebs cycle.

So according to above explanation

Krebs cycle , is the correct answer

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3 years ago

During the t wave of the electrocardiogram, the ventricles are electrically ________ and functionally ________

During the t wave of the electrocardiogram, the ventricles are electrically and functionally