Homework Answers
1. increase the level of calcium in cytosol
2. calcium bind to troponin
3. tropomyosin shifts exposing active sites.
4.myosin forms crossbridge with actin
muscle is contracted then
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The correct sequence for skeletal muscle contraction is: Rank the options below. increased levels of calcium...
5. Number the events of skeletal muscle contraction in correct order: ________ calcium ions bind to...
5. Number the events of skeletal muscle contraction in correct order: ________ calcium ions bind to troponin on the thin filament. ________ tropomyosin shifts, exposing the myosin binding site. ________A power stroke occurs as the myosin head pulls the thin filament towards the m-line . ________ADP and phosphate are released from the myosin head. ________the myosin head binds to the myosin binding site. ________ATP is hydrolyzed and the myosin head is cocked into its resting position. ________ the sarcoplasmic reticulum...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down the T-tubules. What next? What is the correct order of events which result in skeletal muscle contraction? (4 points) a. Once the muscle cell action potential is initiated then calcium ions are released from the sarcoplasmic reticulum. These calcium ions bind to troponin. With this binding, tropomyosin is pulled away from the active sites on actin. Myosin can bind with actin forming a cross...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1 for the first event and number 6 for the last event. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament toward the M line. Calcium ions bind to troponin, which pulls tropomyosin away from actin. ATP breaks the actin-myosin attachment, after which ATP is hydrolyzed and myosin is recocked. The myosin head binds to an actin subunit....
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action...
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action potential blocked from progressing in fibril Myosin phosphatase in muscle O4(MP) activated d. inactivated QUESTION 8 Can be activated by stretch receptors (best answer only) a. Skeletal muscle Ob. smooth muscle Oc. myosin light chain phosphataso Od. A and B QUESTION 9 Action potential leads to activation of neurotransmitter in muscle answer true or false a true b. false c. not sure od silly...
The most important function of troponin-tropomyosin in a resting muscle is: options are : combining actin...
The most important function of troponin-tropomyosin in a resting muscle is: options are : combining actin and myosin to form cross bridges. splitting the ATP for energy during contraction. preventing the binding of actin and myosin. causing the release of Ca ions.
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the...
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the myosin head to cause a power stroke B)When the myosin head releases a phosphate, it can bind actin C)When a new ATP binds to a myosin head, it releases actin D)ATP hydrolysis activates the myosin head so it can bind actin E)When the myosin head binding actin releases ADP, it moves to create the power stroke 2.During skeletal muscle contraction, the length of the...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane...
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane 2 Titin B Required to cause smooth muscle relaxation 3 Actin filaments C Thousands grouped together to form the muscle fiber 4 Tropomyosin D Nerve fiber sympase at muscle fiber 5 Sarcomere E Block active sites on actin filaments to block myosin attraction Acetylcholine F activates myosin cross-bridges in smooth muscle 7 Neuromuscular junction G Muscle sections between Z discs that individually contract 8...
Regarding the neuromuscular junction... a. Depolarization of the presynaptic membrane directly causes voltage-gated calcium channels in...
Regarding the neuromuscular junction... a. Depolarization of the presynaptic membrane directly causes voltage-gated calcium channels in the membrane to open. b. Action potentials in the sarcolemma directly cause calcium channels to open. c. Action potentials in the sarcoplasmic reticulum indirectly cause the calcium ATPase pump to function, if ATP is present. d. both a) and b) are correct, and c) is incorrect e. a), b) and c) are all correct 2) Following ATP hydrolysis by myosin, which steps occur during...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1 for the first event and number 6 for the last event. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament toward the M line. Calcium ions bind to troponin, which pulls tropomyosin away from actin. ATP breaks the actin-myosin attachment, after which ATP is hydrolyzed and myosin is recocked. The myosin head binds to an actin subunit....
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action potential blocked from progressing in fibril Myosin phosphatase in muscle O4(MP) activated d. inactivated QUESTION 8 Can be activated by stretch receptors (best answer only) a. Skeletal muscle Ob. smooth muscle Oc. myosin light chain phosphataso Od. A and B QUESTION 9 Action potential leads to activation of neurotransmitter in muscle answer true or false a true b. false c. not sure od silly...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane 2 Titin B Required to cause smooth muscle relaxation 3 Actin filaments C Thousands grouped together to form the muscle fiber 4 Tropomyosin D Nerve fiber sympase at muscle fiber 5 Sarcomere E Block active sites on actin filaments to block myosin attraction Acetylcholine F activates myosin cross-bridges in smooth muscle 7 Neuromuscular junction G Muscle sections between Z discs that individually contract 8...
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