nu Comparé the condition of the sarcomere at rest and after contraction (a) Sarc

Question

nu Comparé the condition of the sarcomere at rest and after contraction (a) Sarcomere at rest band (b) Sarcomere after contraction A band in I band A band Z line H band Z line Z line Z line H band a. Which band(s) change in length during contraction? b. Which band(s) do not change in length during contraction? 11. Fill in the blank boxes in the concept map at right by using the terms in the list below. .T tubules . Acetylcholine At a neuromuscular junction, symaptic vesicles release Cisternae Sodium ions Sarcoplasm which binds to receptors on the motor end plate and initiates an influx of 12. Describe the role that each of the following has in the contraction of a muscle fiber according to the sliding filament theory a. The power stroke: An action podential spreads along the sarcolemma and causing the release of calcium ions from the b. Calcium ions: sarcoplasmicand . Troponin-tropomyosin complex

Explanation / Answer

A. During muscle contraction I-band and H band shorten

B. During muscle contraction A band does not change in length

11.

a. Acetylcholine

b. Sodium ions

c. T tubules

d. Cisternae

12.

a. Power stroke: myosin head pull the actin filament towards center, results in sliding movement of actin filament over myosin filament.

b. Calcium ions: Calcium ion remove tropomyosin from binding site on actin and allow actin myosin cross bridges to form and initiate contraction.

Troponin tropomyosin complex: troponin attached to tropomyosin within the actin filament. Tropomyosin blocks the attachment site of myosin and prevent muscle contraction results in muscle relaxation.

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.