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Image result for Explain how cells are related to living things.
Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms. Cells provide structure for the body, take in nutrients from food and carry out important functions.
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Ampulla is located at the end.
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Tube feet (podia) are supported by a hydraulic and connective-tissue skeleton under the control of antagonistic muscle pairs systems.
The correct answer is: A. Myofibrils contain thick and thin filaments.
Skeletal muscle cells are called muscle fibers because of their long and cylindrical shape. The plasma membrane of muscle fibers is sarcolemma, the cytoplasm is sarcoplasm, and the smooth endoplasmic reticulum sarcoplasmic reticulum (SR) Sarcoplasmic reticulum is specialized becaused it is involved in the process of contraction, so it stores, releases, and retrieves calcium ions.
The functional unit of a skeletal muscle fiber is the sarcomere which consists of highly organized contractile myofilaments actin that are thin filaments and myosin (thick filaments), together with other support proteins.
The jelly like fluid that fills a cell IS called cytoplasm. It is made up of mostly water and salt. Cytoplasm is present within the cell membrane of a cell types and contains all organelles and cell parts. Most of the important activities of the cell occur in the cytoplasm.
