Explain how titin and antagonistic muscles allow restoration of muscle length after contraction or stretch.
Tę umiejętność sprawdza 8 zadań wzorowanych na arkuszach IB z lat 2022–2026.
After a sarcomere is extended, which action is helped by titin? A. Hydrolysis of all actin monomers B. Release of acetylcholine into the motor end plate C. Permanent locking of neighbouring sarcomeres D. Elastic return towards its resting length
When a relaxed sarcomere is stretched, titin develops a restoring force. Which benefit follows from this property? A. It protects the sarcomere against excessive extension B. It replaces myosin as the ATP-driven walking motor C. It makes a contracting muscle…
Identify the three proteins indicated in this original sarcomere model. A. P: myosin; Q: actin; R: collagen B. P: actin; Q: myosin; R: titin C. P: titin; Q: actin; R: myosin D. P: actin; Q: collagen; R: tubulin
A ribbon representation of part of titin is shown. (i) Describe the secondary structure represented by the arrows and how it is stabilised. (ii) Explain two contributions of titin to sarcomere function.
Explain how titin contributes when a stretched muscle relaxes.
A mutation disrupts the elastic function of titin. Which muscle problem is most directly expected? A. Actin can no longer contain amino acids B. All tendons disappear C. The muscle loses every mitochondrion D. Sarcomeres become more vulnerable to excessive…
Outline why X and Y are described as antagonistic.
Describe the role of muscle Y.
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