Primary Myofilaments vs Secondary Myofilaments
(Difference between the Primary Myofilaments and Secondary Myofilaments of Myofibrils)
Myofilaments are the filaments of myofibrils (myofibrils are the basic structural unit of muscle cells). The myofilaments are composed of proteins particularly actin and myosin. The detailed structural analysis shows that the muscle sarcomere composed of bundles of two types of myofilaments called primary myofilaments and secondary myofilaments. The present post discusses the difference between the Primary Myofilaments and Secondary Myofilaments with a comparison table.
Learn more: Difference between A-Band and I-Band
Difference between Primary and Secondary Myofilaments
Tropic Movements vs Nastic Movements
Similarities and Differences between Tropic Movements and Nastic Movements in Plants
Tropic movements and Nastic movements are the two types of induced or paratonic movements of curvature in plants.
Tropic movements: The paratonic (induced) movement of growth is called tropic movements. Here the stimuli are external and unidirectional. Example: phototropic movements (movement towards the light) geotropic movements (movement towards gravity), chemotropic movements (movement towards chemicals) etc.
Nastic movements: The paratonic movements of variations are called nastic movements. Here the stimuli are external and diffused (not unidirectional). Example: nyctinastic movements (movements in response to darkness), Seismonastic movements or Thigmonastic movements (movements in response to touch) etc.
The present post discusses the Similarities and Differences between Tropic Movements and Nastic Movements in Plants with a Comparison Table.