Complete the sentences describing the steps that occur during excitation-contrac

Question

Complete the sentences describing the steps that occur during excitation-contraction coupling. Then put the steps in order tropomyosin troponin myosin heads transverse tubules actin sarcomere Calcium ionssarcoplasmic lengthens calcium shortens Sodium ions reticulum Drag the text blocks below into their correct order. , permeability of As the electrical impulse reaches the the cisternae to calcium increases. Thin (actin) filaments are pulled toward the center of the by myosin cross-bridges. The muscle fiber and contracts. diffuse from the sarcoplasmic reticulum into the sarcoplasm. These ions bind to molecules After a muscle fiber is stimulated by a motor neuron, an electrical impulse travels along the sarcolemma and deep into the fiber via results in exposure of Interaction between troponin and binding sites on actin. Then bind to these sites. Reset

Explanation / Answer

1. Sarcoplasmic reticulum.

2. Sarcomere.

3. Shortens.

4.calcium ions.

5. Troponin.

6. Sodium ions.

7. Calcium ions.

8.myosin heads

Order;

1.After the muscle fiber is stimulated by motor neuron,an electrical impulse travels along the sarcolemma and deep into the fiber via sodium ions.

2. As the electrical impulse reaches the Sarcoplasmic reticulum, permeability.............

3.calcium ions diffuser from Sarcoplasmic reticulum. ........... These ions bind to Troponin molecules.

4. Interaction between Troponin and calcium results ............... Then myosin heads bind to these sites.

5. Thin actin filaments are ............ centre- of Sarcomere by myosin cross bridges. Muscle fiber shortens and contracts.

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