Homework Answers
The sequence of events in the cross bridge cycle would be
After the membrane channels in the sarcoplasmic reticulum opens a lot of calcium is released.
1)Ca2+ binds to troponin
Calcium allows myosin to bind actin.
2)Myosin head are energized.
ADP Are ejected
3)Power stroke occurs.
4)ATP binds to myosin heads
5)Cross bridges detach
6)Tropomyosin moves;actin binding sites are exposes
as myosin is now bount to ATP
7)ATP is hydrolyzed
next cycle occurs then
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Number these items in the order in which they occur in The Cross- bridge Cycle. #1...
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...
5. (4pts) A. Referring to the cross-bridge cycle in muscle contraction, please match the following changes...
5. (4pts) A. Referring to the cross-bridge cycle in muscle contraction, please match the following changes in myosin binding state to events in the ATP hydrolysis and exchange cycle: Myosin conformation and actin-binding state The myosin motor moves towards the plus end (energized") and binds weakly to actin. Power stroke - Myosin binds tightly to actin, moves to a "rigor" position, & pulls actin. Myosin releases from actin. ATP hydrolysis cycle in myosin a. ATP becomes bound b. ATP hydrolyzes...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged as thousands of . Myosin is a motor protein that moves towards the WWwe end of actin. and eNN Calcium is stored in specialized endoplasmic reticulum called released in response to depolarization of the . Calcium binds to MMMN , uncovering the myosin binding which results in a conformational change in sites on actin. Binding of ATP to myosin causes the hydrolysis of ATP...
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...
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....
Put the events of the cross bridge-cycle in order, beginning with the figure at the top...
Put the events of the cross bridge-cycle in order, beginning with the figure at the top and moving clockwise. ATP is hydrolyzed and phosphate binds to myosin, causing cross bridge to return to its original orientation Cross bridge binds to actin. A new ATP binds to myosin head allowing it to release from actin. P, is released from myosin head, causing conformational change in myosin. Power stroke causes filaments to slide, ADP is released Resting fiber, cross bridge is not...
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the...
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the thick flaments, in a cocked position, form cross bridges with the actin molecules in thin filaments. This activity will test your understanding of the steps that oocur in one complete cross bridge cycle. Place the steps that occur during a single cross bridge cycle in the correct order from left to right. View Available Hint(s) Reset Help ATP is hydrolyzed to ADP and P...
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...
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...
Question Completion Status: QUESTION 1 The neurotransmitter released at the neuromuscular junctio...
Question Completion Status: QUESTION 1 The neurotransmitter released at the neuromuscular junction to signal a muscle contraction is broken down by calicuase norepinephronase neuroglibin acetylcholinesterase QUESTION2 Exocytosis of the neurotransmitter at the neuromuscular junction requires activation of O voltage-gated calcium channels O chemically gated potassium channels O voltage gated sodium channels 0. chemically gated sodium channels Save All Answers 20 Dll F8 oD 69 F5 F6 F7 QUESTION 3 The H-zone of the A band of a sarcomere consists of:...
5. (4pts) A. Referring to the cross-bridge cycle in muscle contraction, please match the following changes in myosin binding state to events in the ATP hydrolysis and exchange cycle: Myosin conformation and actin-binding state The myosin motor moves towards the plus end (energized") and binds weakly to actin. Power stroke - Myosin binds tightly to actin, moves to a "rigor" position, & pulls actin. Myosin releases from actin. ATP hydrolysis cycle in myosin a. ATP becomes bound b. ATP hydrolyzes...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged as thousands of . Myosin is a motor protein that moves towards the WWwe end of actin. and eNN Calcium is stored in specialized endoplasmic reticulum called released in response to depolarization of the . Calcium binds to MMMN , uncovering the myosin binding which results in a conformational change in sites on actin. Binding of ATP to myosin causes the hydrolysis of ATP...
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....
Put the events of the cross bridge-cycle in order, beginning with the figure at the top and moving clockwise. ATP is hydrolyzed and phosphate binds to myosin, causing cross bridge to return to its original orientation Cross bridge binds to actin. A new ATP binds to myosin head allowing it to release from actin. P, is released from myosin head, causing conformational change in myosin. Power stroke causes filaments to slide, ADP is released Resting fiber, cross bridge is not...
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the thick flaments, in a cocked position, form cross bridges with the actin molecules in thin filaments. This activity will test your understanding of the steps that oocur in one complete cross bridge cycle. Place the steps that occur during a single cross bridge cycle in the correct order from left to right. View Available Hint(s) Reset Help ATP is hydrolyzed to ADP and P...
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...
Question Completion Status: QUESTION 1 The neurotransmitter released at the neuromuscular junction to signal a muscle contraction is broken down by calicuase norepinephronase neuroglibin acetylcholinesterase QUESTION2 Exocytosis of the neurotransmitter at the neuromuscular junction requires activation of O voltage-gated calcium channels O chemically gated potassium channels O voltage gated sodium channels 0. chemically gated sodium channels Save All Answers 20 Dll F8 oD 69 F5 F6 F7 QUESTION 3 The H-zone of the A band of a sarcomere consists of:...
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