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
boyakko [2]
3 years ago
9

Normal heart sounds are known as 'lub' and 'dub.' These sounds can be heart with a stethoscope as blood flows through the heart.

According to the model of the heart sound cycle, what most likely causes the sound known as 'lub'? A) The 'lub' sound is caused as the atrioventricular valves close. B) The 'lub' sound is caused as the atrioventricular valves open. C) The 'lub' sound is caused as the semilunar valves close. D) The 'lub' sound is caused as the semilunar valves open
Biology
1 answer:
BaLLatris [955]3 years ago
7 0

Answer: A) The 'lub' sound is caused as the atrioventricular valves close.

Explanation:

USATestprep just answered it

You might be interested in
How is  eukaryotic RNA processed before leaving the nucleus 
Paha777 [63]

Answer:

Messenger RNA, or mRNA, leaves the nucleus through pores in the nuclear membrane. ... During mRNA processing, the introns (non-coding regions) of the pre-mRNA are removed, and the exons (the coding regions) are spliced together. Additionally, a 5' cap and a 3' poly A tail are added to the pre-mRNA

Explanation:

6 0
3 years ago
On a construction site, a worker moves some debris and a bulldozer moves a different pile of debris Which of these best explains
bonufazy [111]

Answer:

The correct answer is - they are both systems that are performing similar functions.

Explanation:

In the given question there are two different entities that do a similar kind of work or perform similar functions, however, the systems are different as one system involves the manpower of a worker whereas the other system involves the high power of a bulldozer.

The work is similar but the amount of the work varies as manual work done by a worker is less in comparison to the bulldozer.

8 0
3 years ago
What process takes place in the structure? A. cellular respiration B. mitosis C. circulation D. chromatography A. cellular respi
Travka [436]
Cell respiration takes place in the mitochondria.
8 0
3 years ago
Read 2 more answers
Directions: Use the information given to you below for each trait to answer the problems that follow. Trait Dominant Form Recess
EastWind [94]
Hi Ari. I haven't finished the homework either. And Mr. Bird is out today. 
4 0
3 years ago
There is a lot of debate about the role of added sugars and refined grains in the development of obesity. Now that you have read
Airida [17]
Hi I will give points tmmrw
4 0
3 years ago
Other questions:
  • Wind moving in two directions over a prairie makes air in the middle spin. This is the beginning of a
    8·2 answers
  • Identify some acids that are found in everyday materials
    7·2 answers
  • The skin and nervous tissues develop from which germ layer?
    6·1 answer
  • A fat contains which molecular components? A fat contains which molecular components? two fatty acids and one glycerol molecule
    6·1 answer
  • Why is the frequency of X–linked disorders greater in males compared to females?Select one of the options below as your answer:
    7·2 answers
  • What have you learned about radioactive dating? Check all that apply.​
    15·1 answer
  • The Kelvin scale deals with extreme temperatures. What is OK equivalent to in degrees Fahrenheit?
    7·1 answer
  • What would happen if there were no condensation stage in the water cycle? A. Water would not convert from gas to liquid B. water
    5·2 answers
  • What is a favorable mutation and Non-favorable Mutation?
    5·1 answer
  • How might a virus infect a cell and remian inside the cell without killing it
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!