Question

In a relaxed muscle fiber, the active sites of actin are blocked by Question 32 options:...

In a relaxed muscle fiber, the active sites of actin are blocked by

Question 32 options:

myomesin.

troponin

calcium ions.

myosin heads.

intermediate filaments.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

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,...
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.
• 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...
Activity 1 Using the list of (10) events for muscle contraction. match the numbers of the...
Activity 1 Using the list of (10) events for muscle contraction. match the numbers of the steps from with the correct periods below in which they would occur. Latent period: Contraction period: Relaxation period Hint- 10 events of muscle contraction 1. Action potential (electrical stimulation) from somatic (motor) nerve stimulates skeletal muscle fibers (cells) at neuromuscular junction 2.“AP” causes the opening of Na+ channels on the sarcolemma thus causing a wave of depolarization to travel from the neuromuscular junction. 3....
Place the following events in the correct order they occur during excitation-contraction coupling in skeletal muscle:...
Place the following events in the correct order they occur during excitation-contraction coupling in skeletal muscle: Myosin forms a tight bond with actin and undergoes the ‘power stroke’. The troponin/tropomyosin complex shifts, exposing the myosin binding sites on the actin filament. Ca2+ binds to troponin. Ca2+ moves out of the sarcoplasmic reticulum (called a “calcium spark”). An action potential in the alpha motor neuron leads to the release of neurotransmitter at the neuromuscular junction. Nicotinic receptors on the motor end...
I have true for all of these, please check my answers. 49. When an action potential...
I have true for all of these, please check my answers. 49. When an action potential travels down an axon to the synaptic knob of a motor neuron innervating skeletal muscle, calcium enters the synaptic knob from the extracellular fluid through electrically gated channels. The entry of the calcium into the synaptic knob results in the release of acetylcholine from synaptic vesicles. T 50. Acetylcholine released from vesicles within the synaptic knob of a motor neuron diffuses across the synaptic...
9. Sarcomeres contain thin filaments of ________ and thick filaments of ________. a.         creatine, adenosine b.        ...
9. Sarcomeres contain thin filaments of ________ and thick filaments of ________. a.         creatine, adenosine b.         hemoglobin, myoglobin c.         troponin, tropomyosin d.         actin, myosin 10. When stimulated by a muscle impulse, what do the terminal cisternae release into the sarcoplasm?         A)    sodium ions, Na+         B)    calcium ions, Ca2+         C)    adenosine triphosphate, ATP         D)    acetylcholine, ACh 11. In the sliding filament model, ________ stay in place and ________ are pulled toward the center...
physiology of muscle contraction, select the correct description of the step from the following three options...
physiology of muscle contraction, select the correct description of the step from the following three options step 1 a. Ca moves out of the synaptic knob triggering exotyosis of acetylcholine b. Ca moves into synaptic knob, triggering exotyosis of acetylcholine c. Ca moves into synaptic knob triggering endocytosis of acetylcholine step 2. a. acetylcholine binds to CG-NA channels, Na moves into myofiber b. acetylcholine binds to CG-NA channels, Na moves out of myofiber c. acetylcholine binds to CG-NA channels, Ca...
6. During relaxation, calcium is transported into the sarcoplasmic reticulum by which of the following? Na+/Ca++...
6. During relaxation, calcium is transported into the sarcoplasmic reticulum by which of the following? Na+/Ca++ antiport Calcium ion ATPase Pump Simple diffusion through Calcium ion channels 7 Which of the following has to occur in order to release the myosin head from actin at the end of the rigor state A molecule of ATP must split Calcium ions must be removed from the troponin-tropomyosin comples ATP must bond to the myosin head, releasing the crossbridge 8. Which of the...
31. What is required in Endochondral Ossification? A. Hyaline Cartilage. B. Fibrous Connective tissue. C. Elastic...
31. What is required in Endochondral Ossification? A. Hyaline Cartilage. B. Fibrous Connective tissue. C. Elastic connective tissue. D. Dense irregular Connective Tissue. E. myofiber.    32. The refractory period is the time: A. between stimulation and the start of contraction. B. when the muscle is shortening. C. when the muscle is lengthening. D. following a stimulus during which a muscle cell cannot respond to another stimulus. E. it takes for acetylcholine to cross the synaptic cleft.   33. Fused...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT