Question

Which protein molecule covers and ides the bindingston the actin bert During contraction of muscle fiber sliding o montina sarcom makes the one become arger Which type of neurogalls are Tropomni-troponin O b. myosin blood-brain bar TRUE FALSE a Schance Odrocytes Select one TRUE FALSE the layer of connective Which of the following neuroga are NOT found in the CNS a Schools Olodendrocytes Astrocytes Endom b. Perimysium О с. Itemyum Weblink for Virtual Class meetings Collections of myelinated in the CNS Which of the following is NOT treo The stronger the stimulus the higher the frequency of action potential Select one hervert TRUE alone, cynical fibers b. M eie To involuntary contro O c Nuclei d. Neves Myelinated conduct faster than nomyelinated a s Select one a Absolute refractory period Select one TRUE Re a ctory period Alone principe When you shiver, muscles TRUE FALSE Which of the following is a characteristic of Red bars in the muscle Which one of the following proteins is Select one O a Myosin Contain very emoglobin and a few mitochondria con f oglobin and a lot of stochondria do tycogen c. Actin Endom

Answer 1

Answer 1 : False

Explanation : When muscle cells are viewed under the microscopes we see that they have a striped pattern, this pattern is formed by a series of basic units called sarcomeres that are arranged in a stacked pattern throughout muscle tissue. These sarcomeres are highly stereotyped and are repeated throughout muscle cells and the proteins within them can change in length which causes the overall length of a muscle to change. A sarcomere contains many parallel thin actin and thick myosin filaments. When a sarcomere shortens some regions also shorten, a sarcomere describes as the distanc between two Z discs and Z lines. When a muscle contracts in body the distance between the Z discs reduces. the central region of the A zone ( H zone) contains only thick filamnets of myosin and becomes short during contraction. H zone becomes smaller by increasing actin overlap and myosin filaments.