Question

Describe what happens to calcium ions and tropomyosin to cause a muscle to relax?

Describe what happens to calcium ions and tropomyosin to cause a muscle to relax?
Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Until calcium ions remain in the sarcoplasm and bind with troponin and ATP is available,muscles continue to contract.when muscle contraction stops after motor neuron signalling have ended , voltage gated calcium channels close in the SR . Repolarization of sarcolemma and T- tubules occur and calcium ions are reabsorbed into the sarcoplasmic reticulum (SR).This causes tropomyosin to Reshield the binding sites on actin strands and the relaxation cycle of muscle starts.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Put the steps of muscle contraction into the correct order Troponin releases calcium and the actin...
Put the steps of muscle contraction into the correct order Troponin releases calcium and the actin binding sites are covered by the twisting of tropomyosin A stimulus from the nerve cell is brought down the T tubule Calcium is released from the SR into the cytoplasm Myosin binds to Actin Calcium is removed from the cytoplasm and actively transported to the sarcoplasmic reticulum tropomyosin untwists and exposes the actin binding sites The thin filament slides closer to the M line,...
Describe 1 physiological cause of muscle fatigue.
Describe 1 physiological cause of muscle fatigue.
Briefly describe the role of calcium in the bone homeostasis and in skeletal muscle regulation. (think...
Briefly describe the role of calcium in the bone homeostasis and in skeletal muscle regulation. (think of the role of hormones and events during muscle contraction
• Slides 31-37: Know how tropomyosin and the troponin complex are bound to actin when muscle...
• Slides 31-37: Know how tropomyosin and the troponin complex are bound to actin when muscle fibers are at rest and when they are contracted; know where calcium ions are bound as part of muscle fiber contraction; also know the organelle in the muscle fiber where the calcium is released when muscle contraction is initiated • Know the difference between oxidative and glycolytic muscle fibers • Know the difference between slow twitch and fast twitch skeletal muscles • Know the...
Describe the neuronal control of skeletal muscle contraction and explain the effects of calcium channel blockers...
Describe the neuronal control of skeletal muscle contraction and explain the effects of calcium channel blockers on blood pressure.
The sympathetic autonomic motorneurons cause the radial muscle cells of the Iris to: A. contract which...
The sympathetic autonomic motorneurons cause the radial muscle cells of the Iris to: A. contract which causes the pupils to constrict B. contract which causes the pupils to dilate C. relax which causes the pupils to dilate D. relax which causes the pupils to constrict E. remain the same size
Altering the concentrations of which of the following ions will have an effect on muscle contraction?...
Altering the concentrations of which of the following ions will have an effect on muscle contraction? You may select more than one answer. Potassium Calcium Magnesium Sodium
What two molecules must be present inside the muscle fiber for muscle contraction to occur? A)...
What two molecules must be present inside the muscle fiber for muscle contraction to occur? A) Calcium ions B) ATP C) Acetylcholine D) Magnesium E) Norephinephrine
In cell structure and function you learned that calcium ions (Ca2+) are stored in the smooth...
In cell structure and function you learned that calcium ions (Ca2+) are stored in the smooth ER. Some signaling pathways in the cell cause the ER to release the calcium ions into the cytoplasm, which causes the calcium ion concentration in the cytoplasm to increase and at the same time the calcium ion concentration in the ER to decrease. Once the signaling pathway is turned off, the calcium is returned to the ER so that the concentration of calcium in...
What is the role of Ca2+ in the control of muscle contraction? a. It causes depolarization...
What is the role of Ca2+ in the control of muscle contraction? a. It causes depolarization of the T tubule system. b. It binds to tropomyosin and breaks actin–myosin cross-bridges. c. It changes the conformation of troponin, which ultimately results in myosin-binding sites being exposed. d. It changes the conformation of myosin heads, causing actin and myosin filaments to slide past each other. e. It blocks the ATP-binding site on myosin heads, enabling muscles to relax.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT