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4vir4ik [10]
3 years ago
6

Explain the role of the valves in the heart

Biology
1 answer:
beks73 [17]3 years ago
3 0

The valves in the heart make sure that blood goes in only one direction. For example, when blood is pumped from the left ventricle the mitral valve won't allow the blood to come back into the left atrium. And the aortic valve will prevent the blood from coming back into the left atrium from the aortic arch.

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Which of the following scenarios represents the best use of a scientific model?
Pepsi [2]
<span> a. predicting weather patterns</span>. Scientific models are used in making predictions. One way to do this is by analyzing big chunks of data from the past, and see if it can predict the present with accuracy. Computers are often used to create this models because of the huge amount of data that need to be manipulated.
3 0
3 years ago
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The action potential spreads through an axon by Group of answer choices depolarizing adjacent membrane to threshold, triggering
Step2247 [10]

The action potential spreads through an axon by depolarizing adjacent membrane to threshold.

  • K+ departs the cell after Na+, which enters the cell first. Ions can move freely across the axon membrane because of the difference during the action potential.
  • Because sodium contains a positive charge, the neuron becomes more positive and depolarized. Potassium channels take longer to open. As soon as the cell does open, K+ rushes out, reversing the depolarization known as repolarization.
  • Sodium channels close during the peak of the action potential when potassium leaves the cell. When potassium ions are effluxed, the membrane potential is lowered or the cell becomes hyperpolarized.
  • Outside of the cell, the concentration of Na+ is greater than inside the cell. while the concentration of K+ is  is greater inside the cell than outside.

learn more about action potential here: brainly.com/question/6705448

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4 0
2 years ago
You go for a run and breathe heavily for an extended amount of time. How is this affecting your pH levels?
Trava [24]

Answer:

You lose your pH levels because your heavy breathing is creating more CO2.

Explanation:

6 0
3 years ago
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All cells exhibit basic structural similarities. The general plan of cellular organization varies between different organisms, b
kotegsom [21]

Answer:

All cells exhibit basic structural similarities. The general plan of cellular organization varies between different organisms, but despite these modifications, all cells resemble one another in certain fundamental ways. Match each description with a feature. separates contents of cell from surroundings made up of contains sugars, salts, and amino acids contains prokaryotic DNA contains eukaryotic DNA matrix?

1. Prokaryotic and eukaryotic cells both has a nucloid/nucleus, organelles, cell membrane, contains ribosomes, has cytoplasm

2. Nucleus; contains eukaryotic DNA

3; Nucloid; contains prokaryotic DNA

4; Cytoplasm; semi fluid matrix, contains sugars salt and amino acids

Explanation:

The cell from latin cella, meaning "small room" is the basic structural, functional and biological units of all known organisms. A cell is the smallest units of life and they are often called the building blocks of life the study of cell is called cytology. cells contains cytoplasm enclosed within a membrane which contains many biomolecules such as potein and nucleic acids. most plants and animal cells are only visible under a microscope with dimensions between 1 and 100 micrometers.

8 0
3 years ago
What is the volume of the rectangular prism?
Sergeu [11.5K]

Answer:

270cm³

Explanation:

Volume of the rectangular prism: length * width * height.

In this case: 6cm * 9cm * 5cm

3 0
3 years ago
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