The two proteins directly involved in muscle contraction are MYOSIN AND ACTIN. The interaction between these proteins is responsible for muscle contraction.
The sarcomere is the basic unit of muscle cells (myofibrils) that mediate muscle contraction both in skeletal and cardiac muscle tissue.
During muscle contraction, myosin and actin proteins slide past each other, thereby leading to sarcomere shortening.
The myosin protein binds to actin filaments and thus myosin acts as a motor protein that drives filament sliding.
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Answer:
The sessile and free-floating species like sea anemones and jellyfish exhibits a selective advantage due to the existence of the features like radial symmetry and a diffuse nerve net as it helps in the greater dissemination of sensory compositions on the entire body and also homogenously exposes the organism to the environment present around it for enhanced sensory discernment. It helps the organism in approaching their environment equivalently from all the sides.
<u><em>22% percentage</em></u><em> of precipitation falls back onto land.</em>
Answer: D. 22%
Explanation:
Water cycle is the phenomenon in which both evaporation and condensation or precipitation of water takes place. Water evaporates from the lakes, ponds, oceans and other water bodies to the atmosphere because of the heat.
The evaporated water or water vapour then form clouds which gets precipitated or condensed and falls back to the land in the form of rain, snow, hail storm, sleet etc.
However, all the forms that fall into the land have one thing in common i.e., all of them come from clouds as the clouds get heavy by the evaporated water.
The answer is CO2=carbon dioxide
why organisms need specialized cells and tissues in order to survive;
the cells get oxygen and nutrients from this extracellular fluid and release waste products into it. Humans and other complex organisms have specialized systems that maintain the internal environment, keeping it steady and able to provide for the needs of the cells.
systems of specialized cells within organisms help them perform the essential functions of life, which involve chemical reactions that take place between different types of molecules, such as water, proteins, carbohydrates, lipids, and nucleic acids. All cells contain genetic information in the form of DNA molecules.
