Answer:
There is nothing inherent in the nature of a large quadruped well-suited for long-distance running that requires us to call this creature a "horse." This illustrates the linguistic design feature of <u>arbitrariness</u>
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Explanation:</h2><h3>
Arbitrariness : </h3>
- No resemblance between the language signal and the thing that it represents. It means there is no connection or relationship between the linguistic forms and the meaning e.g when we pronounce the word house, it has nothing to do with the shape of the house.
- In animal communication, there is often a strong recognizable link between the actual signal and the message an animal wishes to convey.
- In human language, there is no link whatsoever between the signal and the message.
- There is no intrinsic connection between, for example the word elephant and the animal it symbolizes.
Answer:
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Explanation:
Answer:
The source of Calcium (Ca⁺⁺) for the skeletal muscle cells is the sarcoplasmic reticulum, the main store of intracellular Ca⁺⁺.
Explanation:
Calcium (Ca⁺⁺) is an ion that plays an important role in muscle contraction, a process that requires high cytoplasmic concentrations of this ion to promote myofibrillary activity.
The sarcoplasmic reticulum (SR) -equivalent to the endoplasmic smooth reticulum- is an organelle that regulates the contractile activity of skeletal muscle. The two terminal cisterns of the SR attach to the T-tube, forming a triad, which surrounds the myofibrilla.
Once the muscle cell receives the signal to contract, the Ca⁺⁺ channels are opened and allow Ca⁺⁺ to enter the cell, promoting the exit of this cation from the SR and increased its cytoplasmic levels. This stimulates muscle contraction.
