Explanation:
A)Image A represents a peptide hormone that interacts with a receptor, and image B represents a steroid hormone that interacts with the cell’s DNA
The endocrine system involves chemical signalling via the secretion of molecules called hormones into extracellular fluid.
- Steroid hormones are lipophilic, and readily diffuse across cell membranes. They bind to receptors in the interior of the cell to form a complex which regulates gene expression.
- Peptide hormones however,are hydrophilic, and thus cannot readily diffuse across the membrane. They remain outside the cell, binding to receptors which then activate secondary messenger signalling and a subsequent cellular response.
Further Explanation:
Hormones bind to chemical receptors in order to cause specific changes in target cells, these lead to changes in the body's internal environment called homeostasis. It includes the thyroid, parathyroid, pituitary, pineal and adrenal glands along with other regions.
The bone, adipose tissue, heart, pancreas and liver are a few of the regions of the body which show endocrine function. The brain, or control center functions to receive and process the information from the receptor. Effectors receive the control center's command and elicits a response in the form of a feedback loop, that may oppose or enhance the stimulus.
Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.
Learn more about homeostasis at brainly.com/question/1601808
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They are not made of cells and they cannot reproduce on their own.
Hey there!
Here is your answer:
<u>The proper answer to this question is option A "spiral".</u>
Reason:
<u>A spiral galaxy has a little rotation, but not enough to flatten out. </u><span><u>Spiral galaxies consist of a flat, rotating disc containing stars, gas and dust. These galaxies contain what any other galaxy would have for example: Stars, planets, moons, etc... </u>
Therefore the answer is option A.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit</span>
<span>The concept of indirect observation can be seen in the example of using live video streams in order to observe nesting owls. This is due to the fact that the experimenter is not directly viewing the test subjects, but rather utilizing other means to extract the required data.</span>
1)Don't know
2)<span> stratosphere </span>
3)(t<span>roposphere) is the first </span>layerabove the surface and is where the weather of the Earth occurs
