Answer : Option BExplaination / Solution:
Each organised skeletal muscle in our body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fascia. Each muscle bundle contains a number of muscle fibres. A characteristic feature of the muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils. The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.
Q8.The property which doesn’t belong to muscle fibres is :
Answer : Option DExplaination / Solution:
Muscle fibres have properties of excitability, elasticity and contractility but conductivity is not present in muscles fibers. These fibres help in movement of different body parts.
i. highly abundant in muscles of whales and seals . ii. exhibiting cooperative binding of oxygen. iii. allowing organisms to hold their breathe longer underwater.
Answer : Option CExplaination / Solution:
Myoglobin is found to be highly abundant in muscles of whales and seals. Myoglobin being oxygen and iron binding protein allowing organisms to hold their breathe longer underwater.