. Actin and myosin are the two types of protein filaments that make up myofibrils. Actin is a thin filament made up of two strands of globular proteins, while myosin is a thick filament composed of two strands of rod-like proteins. Together, actin and myosin are responsible for muscle contraction and relaxation. Myofibril Contractile element […]
Nucleoli are small, dense, round structures found in the nucleus of eukaryotic cells. They are composed of a combination of ribonucleic acid (RNA) and proteins, including ribosomal RNA (rRNA), transfer RNA (tRNA), and other proteins. These components are organized into a structure known as chromatin, which forms the nucleolus. The function of the nucleolus is […]
