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- Describe the process of skeletal muscle contraction, beginning with an action potential in a motor neuron and ending with the relaxation of the muscle. Your answer should include the following words: neuromuscular junction, T tubule, sarcoplasmic reticulum, calcium, thin filaments, binding sites, thick filaments, sarcomere, Z disc, and active transport.1 . Which of these characteristics describe smooth muscle cells, but not skeletal or cardiac muscle? Group of answer choices a . cell contraction results in some type of movement within the body b. cells become excited as they respond to stimulus from the nervous system c. cells can extend passively when the contraction phase is complete d. cells are mitotic and can divide and undergo hyperplasia as needed If the sarcolemma of the muscle cell is polarized the muscle is likely in this state Group of answer choices a. resting b. refractory c . Kansas d. neutral e. depolarized Which of the following does not correctly describe a way that muscles can be attached to bones? Group of answer choices by a ligament direct fusion to periosteum by a tendon by an aponeurosistrue or false 6. Muscle cells are mesenchymal in origin.7. Myomesin binds to titin molecules and connects adjacent thick filaments to one another.8. FOG fibers are adapted for maintaining posture and for aerobic, endurance-type activities.9. Hemoglobin is the red-colored protein found in muscles.10. The narrow region in the center of each A band that contains thick filaments is the H zone.
- Choose the incorrect statement about skeletal muscle. Question 3 options: Skeletal muscle is made from thousands of muscle fibres running along the length of the muscle. Each myofibril contains repeating patterns of sarcoplasmsic reticulum, giving muscle tissue its typical striated pattern. Each individual fibre in a muscle is a single cell containing multiple nuclei. Within in each fibre, there are longitudinal myofibrils made up from thin and thick filaments.Smooth muscle cells have features that can be like Skeletal muscle, Cardiac muscle, or that can be unique to smooth muscle cells themselves. Match the 3 options below to the description of smooth muscle cells on the left. do NOT possess sarcomeres do NOT possess troponin or tropomyosin neurotransmitters and hormones regulate contraction different cells of the same muscle type can contract or relax in response to the 1. similar to skeletal muscle same neurotransmitter 2. similar to cardiac muscle possess gap junctions for coordinating contraction of multiple cells 3. unique to smooth muscle can generate contraction through an influx of Ca2+ across the plasma membrane use calmodulin and myosin light-chain kinase to start the cross-bridge cycle make use of motor units to control contraction >1. Glycerination disrupts the troponin/tropomyosin complex so that the binding sites are blocked. True False 2. What is the degree of contraction that occurs when glycerol is added to the muscle fiber? 0 75 25 10 100 50
- Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filaments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contractionplease fill in the blanks: 25. The combination of alternating dark A bands and light _______________ bands gives a muscle fiber its striated appearance 27. neurotransmitters are stored in ______________, which are located within synaptic end bulbs 30. cardiac muscle tissue has a long _____________ that allows time for the chambers of the heart to relax and fill with blood between beats 31. smooth muscle tissue contains thick filaments, thin filaments, and ____________ filaments 34. the minimum stimulus required for skeletal muscle contraction is called a ____________ stimulus3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic (OJO) A muscle fiber is made by the parallel apposition of sarcomers. Generation of force relies on the formation of cross-bridges between actin and myosin filaments. In the process of contraction, adenosine triphosphate (ATP) is required both to drive the actin-myosin association-dissociation cycle and to recycle calcium back to the endoplasmic reticulum. Each muscle fiber is innervated by one neuron only. T tubules are plasma membrane invaginations of the sarcolemma that allow excitation-contraction coupling.
- Part B Matching Choose the appropriate words or phrases from column "B" that match the terms in column "A." Words or phrases in column "B" may only be used once. Column B Column A 13. Elasticity A. Every one fires B. Binds muscle fibres together 14. Neuromuscular junction C. Muscle's ability to stretch 15. Myosin D. Attaches to troponin 16. Perimysium E. Has a "head and tail" 17. Neurotransmitter Sarcolemma F. Acetylcholine 18. G. muscle membrane 19. Calcium H. Where nerve contacts muscle 20. All-or-none-principleCan you match the sacromere anatomy with the proper answer from the list below the table graph? Sarcomere Anatomy Description/Reaction Thin Filaments ? Thick Filaments ? A Band ? I Band ? M Line ? H Zone ? Z Disc ? A) G-Actin, F-Actin, Troponin, Tropomyosin B) Myosin C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap D) The point of origin for myosin filaments found in the center of the sarcomere E) An area in the center of the sarcomere marked by the entire length of the thick filaments F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap G) Anchoring point for the thin filamentsThe Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosin