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
When warm air moves over cold air, a warm front forms. The warm air tends to rise along a gentle slope above the cold air and fo
pshichka [43]

Answer:

Since warm air gradually replaces cold air along a warm front, layers of stratus clouds are formed. A continuous drizzly rain tends to fall since stratus clouds typically cover large areas of the sky. Once the front has passed, however, clear and warm weather tends to follow. the answer is stratus clouds and drizzly rain

Explanation:

8 0
3 years ago
Read 2 more answers
Which option is it? Please help
Nat2105 [25]

Answer:

The correct anwser is D. Signals inside the spinal cord

Explanation:

hope this helps :)

7 0
3 years ago
Read 2 more answers
Lodgepole pines, often found in the taiga, have an interesting adaptation for reproduction. These trees produce female cones tha
butalik [34]
The answer should be C
3 0
3 years ago
How does rough ER from smooth ER?
irinina [24]

Answer:

Rough endoplasmic reticulum differ from smooth endoplasmic reticulum by the presence and absence of ribosomes in their surface.

Explanation:

Rough endoplasmic is named so because RER contain ribosomes at their surface and due to the presence of ribosomes rough endoplasmic reticulum play an importnt role in protein synthesis or translation.

 Whereas smooth endoplasmic reticulum does not contain any ribosome in its surface.smooth endoplasmic reticulum helps in the biosynthesis of lipid and steroids along with detoxification of toxic compounds.

3 0
3 years ago
The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds
LekaFEV [45]

The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds from late March through May. There are two pre-mating isolation mechanism at play here,

1. Ecological isolation: The habitats are different, hence the individuals of both the species do not meet. Ephemeral ponds are temporary ponds that develop during rainy days, while the permanent ponds are full of water throughout the year.

2. Temporal isolation: The time of mating is different for both the species to avoid contact between the individuals of closely related species. Red-legged frogs mate in January to March slot and the bullfrog in the March to May slot.

8 0
4 years ago
Read 2 more answers
Other questions:
  • Which of the organic compounds stores and transmits genetic information?
    6·2 answers
  • In nature, which pigment gives red algae it's color
    9·1 answer
  • Describe inflammation. (module 20.13a) inflammation is a vascular response to injury to cause vasoconstriction and reduce blood
    7·1 answer
  • Which statement best describes the composition and function of proteins in organisms?
    7·1 answer
  • The nucleolus __________. the nucleolus __________. is the primary site of protein synthesis is a dark-staining spherical body f
    13·1 answer
  • Search around your house. Name two examples of<br> objects that show mechanical energy.
    9·1 answer
  • Which of the following is not a source of genetic variation? a. Crossing over between sister chromatids b. Crossing over between
    12·1 answer
  • Which of the following is true regarding the process shown below?
    11·1 answer
  • Can someone help with this i’ll give brainiest
    7·1 answer
  • Plants gather the sun's energy using molecules called
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!