Question

number 17-20

10. A Muscle fiber is made up of mabcils 11. Myofibrils are composed of a series of repeated functional units calledSarComeces, which runs from z to z line. Within the myofibrils there are thin and thick myofilaments called achna and muosnSliding of these two myofilaments leads to the contraction of muscles. The thin myofilaments are composed of actinteeamjesinand troponin 12. What are the five physiological characteristics of muscles? hi 13. The junction between a motor nerve and a skeletal muscle is called ace ty l cnol i ne onormal weai 14. What do we call the neurotransmitter released at the junction? i15. What is Myasthenia Gravis? pcondinen causin 16. Define the following: Twitch, Tetany, Tetanus Define a motor unit and recruitment . Define isotonic and Isometric muscle contractions. 19. List the functions of the muscular system (five functions contye moodt Stabi li 20. Compare the three types of muscle tissues contro bocy openings Voluntary |Involuntary |Type of ofLocation Striation Type of Types of muscle tissue Innervation Respiration Cavdiac Sveietal muscies witin a group of ne move r →prima Agon1S+-→ opposite musc e S ergi. St S-ャrhu S cles +h a + have mUscies the same action a muscie +at hoias an origin Stabie nic the tension 、n his muscic remain +ne same、and n was the resort.Iso metric e muscle ncrecses rens mov centwouvdl havenot resur Hec 、s.ae Rned as a Single nerve ceリ ail te muscie . Re ceis orPsof getting mone a

Answer 1

17. A motor unit contains motor neuron and the skeletal muscle fibers which are innervated by motor neuron's axonal terminals.

Motor unit recruitment refers to the activation of additional motor units to strengthen contraction of a muscle.

18. Isotonic muscle contraction refers to muscle contraction where tone or muscle tension remains constant.

Isometric muscle contraction refers to muscle contraction where length remains same.