In a step by step format, write about the process of the blood flow as it enters the heart until it leaves the heart.

Answers

Answer 1

Answer: Blood enter the right atrium of the heart via the vena cava (superior and inferior)
The right atrium contracts to push the blood into the right ventricle through the triscupid valve
The contraction of the right ventricle pushes the blood through the pulmonary valve to the pulmonary artery which carries it to the lungs to be oxygenated
After oxygenation, the pulmonary vein brings blood to the left atrium
Contraction of the left atrium pushes the blood through the mitral valve into the left ventricle
The left ventricle contracts to push the blood through the aortic valve, into the aorta, which carries the blood through the body.

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What is the purpose of the umbilical cord

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The umbilical cord carries oxygenated blood and nutrients and waste to the in and out of the placenta

How fossils of species that lived on Earth for short periods of time and were abundant and were widespread geographically ?

Answers

Answer:

Index fossils represents the fossils of the organisms that lived in a particular geological time zone. The index fossils defines a geological time of a dead organisms. Index fossil ensures that a correct order of geological time appears in a fossil record. The index fossils of organisms that lived for a short period, were abundant and widespread geographically.

Living organisms that are able to make their own food are _____.a. producers
b. primary consumers
c. secondary consumers OR
d. decomposers

Answers

a. Producers

A.k.a. plants

Answer:

producers make there on food

Explanation:

What must skeletal muscles do to move?

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well to move they need help from the muscles, because by their own they are just like a bunch of sticks

skeletal muscles relay on contractions to move the bone they are attached to so it is contract and relax

Population distribution in Europe and Russia is most impacted byA government restrictions
B. cultural differences
C. natural resources
D. climate
Please select the best answer from the choices provided
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Answer:

i think right answer is climate.

Where are most photosynthetic cells in plants found?

Answers

The correct answer is leaves. Leaves are the most photosynthetic cells in plants found. That is mainly because the sunlight goes through the leaves. The photosynthesis simply takes place first in leaves. They are the one responsible for the entrance of the carbon dioxide and the release of the oxygen.

Leaves are definitely where most of the photosynthetic cells are in plants. Since leaves are mostly flat and broad, they provide an ample surface for absorbing light.

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