Lab 11 quiz

OEE QUESTION 39 In a contractile unit of muscle, "thin" filaments are composed of O A. calcium. O B. actin. OC myosin. OD lactic acid. QUESTION 40 Which ofE the following ir acorroct nnir?

QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools

Question 2 During which step of a muscle contraction cycle is ATP needed? when myosin head does a power stroke and release of calcium ions into sarcoplasm when myosin head detaches from actin and release of calcium ions into sarcoplasm when myosin head does a power stroke and pumping of calcium ions back into SR when myosin head detaches from actin and pumping of calcium ions back into SR

Question 1. Describe an action potential in a muscle fiber in detail, know the changes in voltage starting from RMP. Question 2. What is the voltage that causes the sarcoplasmic reticulum to release calcium ions into the cell? Which integral membrane protein is responsible Question 3.What happens to a muscle fiber’s membrane (sarcolemma) once the motor neuron releases theneurotransmitter listed above? What is the change in voltage in the motor end plate? Question 4. Describe how is acetylcholine (neurotransmitter) is released from the synaptic knobs of motor neurons and how it activatesskeletal muscle. Please please please help with these questions, so so srry I know its a lot i am just really stuck! Thank youuuuuu.

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.

Which of the following statements regarding contraction of skeletal muscle cells is NOT true More than one answer may be correct. Question 7 options:   the myofibrils shorten   the thick and thin filaments slide past one another   the thin filaments shorten   the sarcomeres shorten   the thick filaments shorten

Question 14 View the image below and circle the image which shows the sarcomere that can provide optimal muscle tension and why

QUESTION 15 What section of a sarcomere does not shorten during muscle contraction? Al Al Z disk zone zone Zone 1band A band- band Sarcomere Z-disk to Z-disk (sarcomere) O A band I band H zone OUEETIO LIE

Question 2 of 16 The relatively light portion of the A band of skeletal muscle Select the correct response: is light because of the presence of thin filaments. has thick filaments but no thin filaments. is the location of the Z disc. marks the boundary between successive sarcomeres.

Twitchin More than one answer may be correct. Question 13 options:   is structurally related to titin   is someone who has consumed far too much caffeine   is a protein filament used to lock molluscan muscles   is a modified type of neuron that more easily comes to threshold   is a modified muscle cell used to generate and electrical field

Part 1 of 1- Question 1 of 1 During the actin-myosin ATP cycle, if there is no action potential on the muscle cell but lots of ATP available, which of the following statements will be true? • O A. Myosin will be attached to actin but there will be no ATP attached to the myosin head O B. ATP will have been split into ADP and Pi but a crossbridge will not have formed yet OC. The power stroke will have occurred, but no ATP can attach to the myosin head D. The crossbridge between the myosin head and actin will not break

QUESTION 41 Organization of Skeletal Muscle 2 What is the basic functional unit of a myofibril? a. endomysium b. sarcomere C. muscle fiber d. gap junction SOOOC

More than one answer may be correct.  Myogenic cells in smooth muscle   Question 9 options:   are single unit smooth muscle   produce only slow wave potentials   are connected via gap junctions   are part of a functional syncytium   rely on innervation to produce action potentials

QUESTION 7 What is pictured? OA. A fascicle O B. A sarcomere O C. Smooth muscle O D. Epimysium D A B C ப F H E D

QUESTION 9 Which of the following is true about skeletal, smooth and cardiac muscle? OA. They are all striated. B. They all have varicosities. C. They are all multinucleated. O D. They all have actin and myosin. W

You can choose one or more than one options   About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY basic 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  tubules are plasma membrane imaginations of the sarcolemma that allow excitation-contraction coupling

Part B - Electrical and Chemical Events of Muscle Contraction Match the type of articulation with the best description of either its functionality or arrangement of tissue. > View Available Hint(s) Reset Help Motor unit Also known as an 1Cimpulse, 1D a(n) is an electrical signal that is produced on Neurotransmitters excitable membrane such as muscle and nerve tissue. All-or-none principle are chemicals released at the synaptic terminal of a neuron that can transmit an Muscle fatigue Sm impulse to a muscle fiber. Action potential A muscle fiber is either contracted or it's not. This is the Recruitment A runner competing in the 50-yard dash has muscles in the legs that are undergoing Complete tetanus is described as àll the muscle fibers controlled by the same motor neuron. is the process by which a muscle produces more force to pick up a brick verses a feather. You are at the finish line of the Boston Marathon and see a runner fall a few yards from the finish line. This runner is…

97846/variants/911961/take/16/ TEXT ANSWER Question 18 Analyze the image below. Explain what happens during muscle con- traction according to the sliding filament model. Use at least three vocabulary terms in your answer. Refer to specific structures from the diagram in your answer. 11 HOLLO Or õ ó ó ó ó ó ó ó ó ó ó ó ó ó ó • o 17 of 18 Total Questions Answered 12 * * = 6809 All Changes Saved Continue 1:01 AM 2/16/2023

0.75/ Question 20 What is the difference between treppe and tetany? Mark ALL that apply. there is no summation in tetany there is no summation in treppe the contractions successively increase giving a "staircase" image treppe goes away after muscle is fully warmed up treppe is caused by gradual warming of an unstimulated muscle thus increasing diffusion of ions and protein movement needed to cause contractions.

What structures/s is/are responsible for the banding pattern in skeletal muscle cells? (EXPLAIN) Explain the sliding filament theory of contraction.     NO COPYPASTE FROM THE INTERNET, PLEASE! I ALREADY WASTED MY QUESTIONS TO SOME VERY SHORT and COPY-PASTED ANSWERS.

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-principle

Which of the following are part of the muscle contraction process?(More than one answer may be correct, please aid in answering) Question 5 options:   ATP binds and detaches myosin head from actin   GTP is hydrolyzed to GDP + P   Acetylcholine released into neuromuscular junction by motor neurons   Prolactin stimulates the reuptake of ATP.   Ca2+ binds to troponin which moves tropomyosin away from actin

Question 4 of 16 The physiologic event that takes place at the sarcolemma of a skeletal muscle cell is the Select the correct response: propagation of an action potential. crossbridge cycling. binding of calcium by troponin. release of Ca2+.

Ans 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 contraction   Titin 4.           Is a dense connective tissue that surrounds the entire muscle   H zone 5.           Anchors thin filaments together   Z line 6.           Have high concentration of mitochondria   Sarcomere 7.           The region of thick filaments that has no overlap with thin filaments   Actin and myosin 8.           Is the functional unit of skeletal muscle   Epimysium 9.           Occurs in skeletal and cardiac muscles   Sarcoplasmic reticulum 10.        Generate the mechanical force of a muscle through crossbridge cycling Matching between Column I and corresponding definition or function in column II ?

Arthropod muscle fibers typically do not generate action potentials. Using your knowledge of their innervation, explain how their contractile elements are activated in a rapid and coordinated fashion.

Muscle contraction and cytokinesis both require motor proteins and microtubules. Select one: a. False b. True Clear my choice