Read the following statements and choose the following option: 1. Smooth muscles are associated with body posture 2. Smooth muscles are known as involuntary muscles 3. Each muscle fibre is lined by the plasma membrane called sarcolemma. 4. Muscle fibre is a syncitium as the sarcoplasm contains many nuclei. 5. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium io

Step-by-step solution

Activities of smooth muscles are not under the voluntary control of the nervous system and are therefore known as involuntary muscles.,The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere ,Muscle fibre is a syncitium as the sarcoplasm contains many nuclei. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium ions.