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
GuDViN [60]
3 years ago
7

Which of the following is NOT true regarding the sounds associated with the heart? Select one: a. The "lub-dub" sound originates

from the physical act of the heart contracting. b. The "lub-dub" sound originates from blood turbulence through the heart.
Biology
1 answer:
Valentin [98]3 years ago
7 0

Answer:

B) The "lub-dub" sound originates from blood turbulence through the heart.

Explanation:

The systole and diastole in the heart produce the lub and dub sound in the heart.

The systole represents the contraction of both left and right ventricles and pumps the blood to the body and the right ventricle to the lungs. This involves the opening and closing of the valves. The closing of the atrioventricular valves produces lub sound.

At the end of the systole or ventricular contraction or when the blood has been pumped to the aorta and the pulmonary valves then the semilunar valves present in the aorta and pulmonary closes. This produces a sound dub.

Therefore,lub dub is associated with the physical contraction of the heart but not the turbulence of the blood.

Thus, the selected option is the correct answer.

You might be interested in
You are studying a protein that you call Protein X. There is an aspartic acid at a key position in Protein X which is important
Sonbull [250]
<h2>Answer:</h2>

The same type of amino acid, means acidic amino acid substitution will leads to normal folding.

The amino acid will be glutamic acid.

<h3>Explanation:</h3>
  • Sometimes the amino acids of the same type substitution leads to normal proteins.
  • As the acidic group of aspartic acid is responsible for the folding of the protein .
  • So if the amino acid is substituted by glutamic acid, it will not leads to any abnormal protein folding.
  • Because glutamic acid also has a acidic group which is responsible for folding of protein.


4 0
3 years ago
Look up viruses. Write a short summary of what they are and what they do.
vlabodo [156]

Answer:

Viruses are neither prokaryotes nor eukaryotes because they lack all of the characteristics of living things except for the ability to reproduce. They are considered parasitic because they cannot live or replicate without a living host. Viruses consist of genetic material (either DNA or RNA), a protein coat, and sometimes a lipid envelope surrounding the protein coat. They have no function except to reproduce.

7 0
3 years ago
Which eye structure is primarily responsible for making the adjustments required to focus on objects both near and far?.
lbvjy [14]

Answer:

The lens

It helps to focus on objects and light

5 0
2 years ago
Why do we have ACE2 proteins?
Neporo4naja [7]

Answer: It is the key to blocking infections

Explanation: I hope this is right :)

8 0
3 years ago
What happens to DNA when the temperature is increased to near boiling?
wariber [46]

It breaks down and is denatured as any other protein molecule

7 0
3 years ago
Other questions:
  • Which of these would be the end of meiosis I and the beginning of meiosis II?
    12·2 answers
  • What drug type is most likely to cause respiratory depression and myxedema coma in clients with thyroid disorders?
    12·1 answer
  • Most auditory nerve fibers carry messages _______ hair cells.
    14·2 answers
  • Cats have a gene that codes for the colour of their fur.Suppose that a certain breed of cat can have black, gray, or white fur.
    6·1 answer
  • How do trees interact with other organisms?
    8·1 answer
  • What is pulmonary circulation?
    7·2 answers
  • What is the role of shell-building marine creatures in regulating climate?
    15·2 answers
  • An old tree near Zion National Park reached the end of its life and fell over. Create a path of a carbon atom as it moves throug
    14·2 answers
  • what do you call the sex cell. of the flowering plant? a. gametess b. spores c. budding d.pollination. pls answer i need the ans
    8·1 answer
  • Why do the polypeptides made in prokaryotes always contain formyl methionine as the first amino acid?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!