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
Bruce Wallace (1963) established a laboratory population in which the recessive allele lt was at a frequency of 0.5. He propagat
Alenkinab [10]

Answer:

a. True

Explanation:

Bruce Wallace was a professor emeritus of genetics who performed many population studies. He worked in 1958 at the University of Cornell as a professor of genetics. In 1963, he performed a population study wherein the recessive allele <em>It </em>was at a frequency of 0.5. The population was propagated for 10 generations and the frequency of <em>It</em> for each generation was determined.

The result of this study showed that<em> lt/lt </em>died without reproducing, whereas, individuals with genotype <em>+/+ </em>were normal.

8 0
3 years ago
A farmer wants to reduce the need for pesticides at his farm. What should he do? A. Practice conservation tillage. B. Use benefi
bezimeni [28]

Your correct answer is B.)

4 0
3 years ago
Read 2 more answers
Which of the following causes a tumor to form?
Murljashka [212]
The answer is Uncontrollable cell division.
7 0
3 years ago
Read 2 more answers
Bacteria can reproduce quickly by means of binary fission. Because of this
Nesterboy [21]

Answer:all the offspring will be genetically identical.

Explanation:

3 0
3 years ago
Read 2 more answers
A species that influences the survival of many other species in an ecosystem is called a(n)
Ede4ka [16]

Answer:

an invasive species

Explanation:

i think ;v

8 0
3 years ago
Other questions:
  • Which of the following pairs of terms could be used to describe a bullfrog that is active at night and enters a state of complet
    13·2 answers
  • Your classmate will be doing a presentation on evolutionary medicine in science class. What is he likely to discuss?
    10·1 answer
  • 1. What is a macromolecule? Name four macromolecules present in all living things and identify what they have in common.
    5·1 answer
  • Which terms name families of elements
    7·2 answers
  • A ligand produces a response in a cell if it finds the right kind of
    5·1 answer
  • Jill is always tired, has sluggish movements and appears to be depressed. she has gained weight and her skeletal muscles are wea
    9·1 answer
  • Match the terms to their definition. 1. dominant a gene or trait that is masked when a dominant gene is present 2. genotype a ge
    13·1 answer
  • How does the body regulate blood glucose? Please use the vocab on the right side
    13·1 answer
  • Protein is digested completely in the
    13·2 answers
  • Look at the table for energy used in activities. James goes walking for 1.5 hours a week and running for 0.5 hours. James has a
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!