1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AysviL [449]
3 years ago
7

What causes the atrioventricular valves to close during a heartbeat? a Pressure in the atria is higher than in the ventricles. b

Pressure in the atria is lower than in the ventricles. c Pressure in the arteries is higher than in the ventricles. d Pressure in the arteries is lower than in the ventricles.
Biology
1 answer:
max2010maxim [7]3 years ago
6 0

Answer:

The correct answer is -  b Pressure in the atria is lower than in the ventricles.

Explanation:

The atrioventricular valves close when the pressure in the ventricles is more than the pressure in the atria. Which leads to the contraction of the papillary muscles to shut the leaflets of the valves,

When the ventricles relax, atrial pressure exceeds ventricular pressure, the AV valves are pushed open and blood flows into the ventricles. However, when the ventricles contract, ventricular pressure exceeds atrial pressure causing the AV valves to snap shut.

You might be interested in
Page 360 9.1. what shapes infancy? recreational drug use during pregnancy is very dangerous. which recreational drugs have been
algol13
<span>Based on a study of recreational drugs that have been linked with a higher incidence of sudden infant death syndrome was the use of Marijuana and other recreational drugs like cocaine, crack, crystal, amphetamine, methamphetamine, and speed but cocaine was the most commonly used drug. The basis of the infant sudden death was that both maternal and paternal were using at the time of conception and during in the latter stage of pregnancy. Tobacco smoking of the mother during pregnancy can also affect the life of the baby. There is statistics base on the study on how many percents it will affect the condition of the infant.</span>
8 0
3 years ago
Where do most living things get the energy they need for life?
Eduardwww [97]

Answer:

The best answer choice is C. either from food or sunlight

Explanation:

Humans and Animals need to eat food to get energy

Plants use sunlight to create their own food.

6 0
3 years ago
"reinforcement is most likely to occur when ________."
Troyanec [42]
Answer B did this a few ago
3 0
3 years ago
In a particular plant, green seed color is dominant to yellow seed color. If a homozygous
Sergio039 [100]

Answer: 100% will be heterozygous green.

Explanation:

Since both parents (green and yellow) are homozygous and green is dominant, when they are crossed all the resultant offsprings will have both genes of green and yellow in their genotype but will appear as green( phenotype) because the green colour is dominant and has masked the yellow colour which is recessive.

8 0
3 years ago
If a DNA molecule is found to be composed of 35% thymine, what percentage of cytosine would be expected, and why?
-Dominant- [34]
We use Chargaff's rule to get the answer. [A] + [G] = [C]+ [T].    [A] + [G] + [C] + [T] = 100% Where is A is Adenine, G is Gaunine, T is Thymine and C is Cytosine. In DNA, Adenine always pairs with Thymine, and Guanine always pairs with Cytosine. Therefore if Thymine is 35%, then Adenine will also be 35% to make 70% in total. The remaining percentage will be 100% - 70% = 30%. The 30% will be shared equally among Cytosine and Guanine, at 15% each. Therefore Cytosine will be 15% 
4 0
3 years ago
Other questions:
  • Extinction results in _____.
    11·2 answers
  • How do we classify finger prints?
    13·1 answer
  • A- 0.455 g B- 5.50 g C. 4.56 g D. 0.55 g
    11·1 answer
  • Suppose Alia recently learned that she inherited a mutant BRCA1 allele from her mother, who had breast cancer. BRCA1 is a tumor
    15·1 answer
  • Explain what is sercretion​
    9·2 answers
  • Which part of an amino acid gives it its unique identity? Which parts do all amino acids share?
    13·1 answer
  • What effects do humans have on erosion
    8·1 answer
  • What are at least 3 things that are not a lipid?
    14·2 answers
  • Genes for traits that help an organism be more successful reproductively can be expected to
    8·1 answer
  • Why can't we use the oil immersion lens on live cells?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!