Umiejętności z tego działu sprawdza 25 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 14 z 54 arkuszy w bazie.
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
A volunteer takes a deep breath within the ventilation trace. Which muscle pattern occurs at T? A. Diaphragm relaxes while both intercostal groups contract B. Diaphragm contracts and external intercostals contract while internal intercostals relax C. Diaphragm…
The simplified hip-joint diagram labels two bones and a band connecting them. Which identification is correct? A. X is the femur; Y is a tendon; Z is the pelvis B. X is the pelvis; Y is a ligament; Z is the femur C. X is the pelvis; Y is a muscle belly; Z is…
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.
Describe a method for measuring the range of motion at a joint.
Distinguish the skeleton of an arthropod from that of a vertebrate.
Which pair of structures occurs in both mammalian cardiac muscle cells and skeletal muscle fibres? A. Chloroplasts and mitochondria B. Central vacuoles and cilia C. Cellulose walls and sarcomeres D. Sarcomeres and mitochondria
Which description correctly links a structure at a synovial joint with its function? A. A tendon conveys pulling force from muscle to bone B. Synovial fluid fixes the two bones rigidly together C. A ligament generates force by sarcomere shortening D. Cartilage…
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