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
Varvara68 [4.7K]
3 years ago
14

When the atria contract, which of the following is true? a. The AV valves are closed. b. The ventricles are in diastole. c. The

atria are in diastole. d. The semilunar valves are open.
Biology
1 answer:
gizmo_the_mogwai [7]3 years ago
5 0

Answer:

b. The ventricles are in diastole.

Explanation:

Atrial systole is the phase of the cardiac cycle that lasts for about 0.1 sec. During this phase, the atria are contracting. At the same time, the ventricles are relaxed or are in diastole. The pressure of the contraction of atria forces the blood to open the AV valves. The blood enters the ventricles through the open AV valves. During this phase, the semilunar valves are closed as the blood pressure in ventricles is very low. The P wave of ECG represents the atrial systole. This is followed by the systole of ventricles.

You might be interested in
Which of the following is not a mechanism for biological evolution
elena55 [62]
If you're answers consist of:
<span>
a. mutation 
b. genetic drift 
c. inheritance of acquired characteristics 
d. natural selection

Then you're answer is D.) Natural Selection 

Hope this helped!! :)</span>
5 0
3 years ago
He says ' I have no Class today 'turn in to indirect speech ​
Svetach [21]
Reported or indirect speech is usually used to talk about the past, so we normally change the tense of the words spoken. We use reporting verbs like 'say', 'tell', 'ask', and we may use the word 'that' to introduce the reported words. Inverted commas are not used.
7 0
3 years ago
Read 2 more answers
the mitochondria, where cells energy is made, is often considered to be the cells control system(t or f)
timofeeve [1]
Might be t but I’m really not sure
8 0
3 years ago
Read 2 more answers
As you finish your college degree, you learn that the mountain behind your childhood home in the hills of the town you grew up a
telo118 [61]

In this situation, I would try not to allow the exploitation of the mountain to occur, degrading nature and the property that her family has, because her brother may look for another job, but nature would not recover.

<h3>What are the impacts of coal mining?</h3>

The burning of coal for energy produces highly toxic effluents, such as mercury and other heavy metals such as vanadium, cadmium, arsenic and lead. In addition, the release of carbon dioxide causes pollution in the atmosphere, exacerbating global warming and contributing to acid rain.

With this information, we can conclude that Sedimentation and pollution of rivers due to improper disposal of unused material would make life on the family's property unfeasible.

Learn more about coal mining in brainly.com/question/12880911

#SPJ1

6 0
2 years ago
The adaptive advantage of a fungus producing and secreting a bacterial inhibitor would be that it protects against microbial com
Advocard [28]

The adaptive advantage of a fungus producing and secreting a bacterial inhibitor would be that it protects against microbial competitors: is an extensive surface area well suited for invasive growth and absorptive nutrition.

Fungus

A fungus is any eukaryotic organism that includes microbes like yeasts and moulds, as well as the more recognisable mushrooms. These organisms are classed as a kingdom distinct from the other eukaryotic kingdoms, which include Plantae, Animalia, Protozoa, and Chromista in one traditional taxonomy.

The presence of chitin in fungi's cell walls distinguishes them from plants, bacteria, and some protists. Fungi, like animals, are heterotrophs; they obtain nourishment by absorbing dissolved molecules, usually by secreting digestive enzymes into their surroundings.

Fungi, like plants, use chemical defence, which involves the creation of poisons that affect the growth, development, or viability of the antagonists.

To learn more about fungus

brainly.com/question/10878050

#SPJ1

5 0
1 year ago
Other questions:
  • Can u help with tee rock part and plz asap I really need help
    14·2 answers
  • Do you know how to do this? can you help me please
    13·1 answer
  • Which of the following is the best definition of empirical evidence?
    14·2 answers
  • Mutations ______.
    13·1 answer
  • It is necessary for the immune system to clearly distinguish foreign cells and proteins from those made by the body.
    15·1 answer
  • Two heterozygous loonas are crossed. What proportion of the offspring will have black hair?
    9·1 answer
  • Moving substances from a lower concentration to a higher concentration requires
    10·1 answer
  • Describe what occurs during cancer cell division.
    11·1 answer
  • 25 points, I mark brainliest! :)
    7·1 answer
  • Describe how an organism is classified currently hy Biologist
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!