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GalinKa [24]
3 years ago
10

Closure of the atriventricular valve occurs when:

Biology
1 answer:
elena55 [62]3 years ago
4 0

Answer:

The correct answer will be option A.

Explanation:

The atrioventricular valve is one of the four valves present in the heart the function of which is to stop the back flow of the blood from the ventricles to the atrium.  

These valve opens and closes in response to the change in the pressure of the blood in atrium and ventricles.  The valve opens when blood is pumped form the atrium to ventricles which causes the papillary muscles to relax while the valve closes when the ventricles push the blood to the arteries. This causes the papillary muscle to contract which causes the chordate tendineae to create tension ad close the valve.

Thus, option A is the correct answer.

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Plant roots can be fibrous or a taproot. When there is not enough water in the environment some plants send their taproot furthe
kykrilka [37]

Answer:

B

Explanation:

the answer is B

5 0
3 years ago
One of the many tests done during urodynamic studies is the sphincter electromyelogram. What does this test study
eduard

One of the many tests done during urodynamic studies is the sphincter electromyelogram. This test studies activity of the voluntary muscles of the perineal area.

  • Patients with urine incontinence or other symptoms of the lower urinary tract can be diagnosed with urodynamic testing.
  • Both men and women take these examinations. Nerve and muscle function are measured by urodynamic testing.
  • Clinically, perineal sphincter electromyography may be helpful in assessing individuals with bowel, urinary, and sexual dysfunction.
  • All patients with a history and clinical examination that point to a central or peripheral sacral neuropathic lesion should be given this option.
  • The pudendal nerve innervates the external sphincter (EAS), which is the best muscle for identifying neuropathic lesions in lower sacral myotomes.

learn more about urodynamic studies here: brainly.com/question/10448206

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8 0
1 year ago
Read 2 more answers
Assume in otters short hair (L) is dominant to long hair (l) and black hair (B) is dominant to brown (b). If you found a black s
Georgia [21]

Answer:

llbb

Explanation:

<em>The genotype of the black, short-haired otter could be determined by testing-crossing with a brown, long-haired otter whose genotype would be </em><em>llbb</em><em>.</em>

Analysis of the resulting zygote from the cross would give an indication of the genotype of the otter - whether it has two dominant alleles each for the black, short-hair traits or heterozygous.

<u>If the otter has two dominant alleles for the two traits, all the resulting zygote from the test-cross would have black, short-hair, but if it is heterozygous, a mixed phenotype set of zygote would be obtained.</u>

5 0
3 years ago
Describe how a new mRNA transcript is processed before it leaves the nucleus.
Schach [20]

Answer:

removal of introns, addition of 5' cap and 3' tail to mRNA.

Explanation:

The mRNA is processed before it leaves nucleus. The introns are removed and exons are remain in mRNA. This process is called splicing. The 5' end is attached with a cap and 3' is attached with a polyadenylated tail. Thus mRNA is processed with these process before it leaves the nucleus.

3 0
3 years ago
During the cell cycle, A. DNA is replicated before mitosis begins. B. DNA is replicated once before mitosis and again before cyt
saw5 [17]

Answer:

The correct answer is A    DNA  is replicated before mitosis begins

Explanation:

DNA replication is one of the most significant event of a cell cycle. .DNA replication occur in the S phase or synthesis phase of the cell cycle.

       DNA is replicated once per cycle to maintain to normal chromosome number in daughter cells.

     DNA is replicated to form two new DNA molecules which are then equally distributed in each daughter cell during the mitosis phase.

5 0
3 years ago
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