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3 years ago

An individual’s EKG shows changes in atrial contraction. Which image shows contraction of the atria?

Biology

2 answers:

Lelu [443]3 years ago

8 0

The third image is the one with the contraction of the atria.

Jlenok [28]3 years ago

7 0

The right answer is The first image (the left one).

An atrium is an upper cavity of the heart, delimited by a thin wall, receiving blood from the bloodstream. There are two in the human heart, they allow the passage of blood from the veins (cellars and lungs) to the ventricles (right and left).

In its upper part (near the entrance of the superior vena cava) is located the sinus node, microscopic structure from which the electrical impulse which ensures the contraction of the heart (especially atrium) ...

The depolarization of the action potential is conducted step by step in the cells of the right and left atria, accompanied by a contraction of the muscle fibers.

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Pepsi [2]

Answer:

As scientists learned more about genetics and biochemistry , some organisms were moved out of existing kingdoms and into new ones.

Explanation:

As the researches in the scientific world continued, scientists realized that there were, in fact, many genetic diversities present in organisms which were placed in the same groups. Hence, they realized that due to these differences these organisms should not be kept in the same group. As a result, the groups in the classification system increased.

Carolus Linnaeus just grouped organisms based on their features. But today, scientists classify organisms based on various perspectives such as the evolutionary history, genetic similarities etc.

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3 years ago

________ are characteristics of downcutting streams and a youthful stage of valley evolution.

Morgarella [4.7K]

For the answer to the question above, I'll just complete the sentence for the answer to your question. "Radial" are characteristics of downcutting streams and a youthful stage of valley evolution.
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2 years ago

There's a good evidence that a meteor hit earth about 65 million years ago which of the following events that the scientist thin

Aloiza [94]

Is this a true or false question?

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3 years ago

Suppose the human trait for freckles is controlled by a simple dominant and recessive relationship at one locus. Freckles, F, is

Dennis_Churaev [7]

Answer:

0.549 is the frequency of the F allele.

0.495 is the frequency of the Ff genotype.

Explanation:

FF or Ff genotypes determine freckles, ff determines lack of freckels.

In this class of 123 students, 98 have freckles (and 123-98= 25 do not).

If the class is in Hardy-Weinberg equilibrium for this trait, then the genotypic frequency of the ff genotype is:

q²= 25/123

q²=0.203

q= $\sqrt{0.2$

q= 0.451

q is the frequency of the recessive f allele.

Given p the frequency of the dominant F allele, we know that:

p+q=1, therefore p=1-q

p=0.549 is the frequency of the F allele.

The frequency of the Ff genotype is 2pq. Therefore:

2pq=2×0.549×0.451

2pq=0.495 is the frequency of the Ff genotype.

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3 years ago

select the correct answer. what is the complementary base sequence of the dna strand if the template strand reads ttgcacg? a. cc

forsale [732]

The answer is C

Explanation:

a-t

t-a

g-c

c-g

7 0

1 year ago