A cell can only respond to signals from other cells, not from the physical environment.

1 answer:

8 0

A cell can only respond to signals from other cells, not from the physical environment. receptor activation. The ability of a specific tissue or organ to respond to the presence of a hormone is dependent on: the presence of the appropriate receptors on the cells of the target tissue or organ.

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ch. 4 After inhalation into the lungs, oxygen gas is more concentrated in the _____ and diffuses into the _____.

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From what we know, we can confirm that after inhalation into the lungs, oxygen gas is more concentrated in the alveoli and diffuses into the blood.

<h3>Why does this happen?</h3>

The alveoli are the primary place for the interchanging of gases to take place. This means that oxygen enters the lungs and makes its way into the alveoli, where it diffuses into the bloodstream in exchange for <u>carbon dioxide </u>that is later expelled from the body during <u>exhalation</u>.

Therefore, we can confirm that after inhalation into the lungs, oxygen gas is more concentrated in the alveoli and diffuses into the blood.

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What does it mean when organisms are in the same horizontal line<br>in a cladogram

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A cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny. A cladogram is used by a scientist studying phylogenetic systematics to visualize the groups of organisms being compared, how they are related, and their most common ancestors. A cladogram can be simple, comparing only two or three groups of organisms, or it can be enormously complex and contain all the known forms of life.

Cladogram design is universal, although simple. A cladogram consists of the organisms being studied, lines, and nodes where those lines cross. The lines represent evolutionary time, or a series of organisms that lead to the population it connects to. Nodes represent common ancestors between species. At some point in the past a population of common ancestor organisms was divided, giving rise to the different organisms being studied. Some cladograms show evolutionary time through the scale of the lines, longer lines meaning more time. Some cladograms chose to show extinct species, while others omit them. Any particular cladogram is formulated specifically for the use it is needed.

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