The functions of certain cells or organs are regulated by hormones, which circulate in the circulation.
Some basic characteristics of a hormone are:
- They are substances generated chemically by certain endocrine gland cells.
- Circulation carries them to the desired cells, tissue, or organ.
- They act according to their kind.
- They are present in incredibly small numbers. Most of them are soluble in water.
- They have a light molecular structure.
- After acting, they are destroyed.
- They are heterogeneous substances in terms of composition.
- They can't be kept for a very long period; typically, they are synthesized and secured as needed.
- Typically, they create hormone receptor complexes in target cells to activate them.
Learn more about the characteristics of hormones here:
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Answer:
Feathers perform a number of functions for a bird:
1) They provide insulation, body temperature of most birds is maintained at around 40 C.
2) Feathers allow for flight.
3) Feathers control what a bird looks like by supplying the bird with colors.
Explanation:
Feathers insulate birds from water and cold temperatures. They may also be plucked to line the nest and provide insulation to the eggs and young. The individual feathers in the wings and tail play important roles in controlling flight. Some species have a crest of feathers on their heads.
The most common types of cancer occur in AIDS patients are Kaposi's Sarcoma, non-Hodgkin's lymphoma, and cervical cancer (in women). AIDS patients are immunocompromised so that their immune system is weak. Therefore, the most common type of cancer in AIDS patients is liver cancer.
Metaphase leads to anaphase, during<span> which each chromosome's sister </span>chromatids separate<span> and move to opposite poles of the cell. Enzymatic breakdown of cohesin — which linked the sister </span>chromatids<span> together</span>during<span> prophase — causes this separation to occur.
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