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anygoal [31]
3 years ago
8

What happens to the mitral and the tricuspid valve when the ventricle contracts

Biology
1 answer:
Dmitrij [34]3 years ago
7 0
These valves (more generally called the atrioventricular valves) are there to prevent back flow of blood from the ventricles to the atria when the ventricles contract. The same thing happens in both of them:


As the ventricles contract, the pressure in the ventricles increases. This, due to the fact that the valves are one way valves, causes the tricuspid and mitral valves to clamp shut. Then, as the ventricles keep on contracting, and blood is pushed upwards, is it prevented from travelling back into the atria and must travel out of the semilunar valves, through to the aorta and pulmonary artery and out of the hear. 
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Which purpose did models serve in ancient egyptian and chinese tombs?
bearhunter [10]
The correct answer of the given question above would be option A. The purpose that the models served in ancient Egyptian and Chinese tomb is that, they were meant to make tombs more beautiful. These are wooden models which show ships, potters, servants and carpenters. Hope this answer helps.
6 0
3 years ago
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The diagram shows three steps in the carbon cycle.
Bumek [7]

Answer:

A. Cellular respiration

C. Photosynthesis

Explanation:

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2 years ago
The population of a colony of mosquitoes obeys the law of uninhibited growth. If there are 1000 mosquitoes initially and there a
Agata [3.3K]

Answer:

2,855 is the size of the colony of mosquitoes after 4 ​days.

Explanation:

The law of uninhibited growth is given as:

A=A_o\times e^{k\times t}

A_o= Original amount

A = Amount after time t

k = Positive constant repressing the rate of growth

We are given with:

Original population of mosquitoes = 1000

Population of mosquitoes after 1 day =1300

t = 1 day

1300=1000\times e^{k\times 1 day}

k = 0.2623 day^{-1}

Population size of mosquitoes after 4 days

A_o=1000, k= 0.2623 day^{-1}

A =? , t = 4 days

A=1000\times e^{ 0.2623 day^{-1}\times 4 days}

A =2,855.36 ≈ 2,855 mosquitoes

2,855 is the size of the colony of mosquitoes after 4 ​days.

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Tip or up vote true or false Evolution is accepted by most scientists as a fact of nature.
stira [4]
This answer
 would be true
3 0
3 years ago
Question 9 (1 point)
Dimas [21]

Answer:

True

Explanation:

It is true as in Mendel's law of inheritance

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