Myofibrils are the building blocks or contractile unit of each muscle fiber. The tiniest functional unit of skeletal muscle, the sarcomere, is found in the myofibrils and is made up of protein filaments: actin (thin) and myosin (thick).
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It is called the Matrix (Mitochondrial matrix)
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There are many features that make bacteria survive in harsh conditions. Bacteria are found almost everywhere. There are various types of features found in bacteria. They can survive in harsh conditions because of the energy-generating enzymes, protein synthesis mechanism, biodegradative enzymes, and cell membranes. This adaptation helps them to survive in extreme conditions.
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