A dark brown to black pigment occurring in the hair, skin, and iris of the eye in people and animals. It is responsible for tanning of skin exposed to sunlight.
The muscles are composed inside mainly of fibers, filaments and proteins, where it is important to consider the <u>length-tension</u> relationship of the thick and thin filaments to know the tension.
<h3>What is muscle contraction?</h3>
It is an organized and natural event that takes place at the level of the muscles when the fibers and proteins inside them come together, and tension is produced in the area.
<h3>Characteristics of muscle contraction</h3>
- In a muscle contraction, a tension is generated that depends on the length-tension relationship, which causes a displacement of the muscle filaments.
- The proteins actin and myosin join together, and a force is generated so that the final movement is achieved.
- To know the tension, the muscle changes length and measurable external work is produced from the force and distance traveled.
Therefore, we can conclude that the contraction allows us to make movements to reach and carry our extremities to different places.
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They are unicellular prokaryotes, that are lacking membrane bound organelles.
Answer:
Homeostasis is meant to keep your body consistent at all times. For example if you are sick, it is good that you have a fever because that is a sign that your body is fighting off the sickness to get you back to normal.
Explanation:
Answer:
trees
Explanation:
Trees are a renewable resource because harvested trees can be replaced with newly planted trees, replenishing cleared woodland areas with new growth.