Movement: skeleton, joints and musclesIB MYP Biology: Mind map

Exam questions on Movement: skeleton, joints and muscles

1. A handball goalkeeper in Denmark dives across the goal to block a shot. Her shoulder swings her arm in a wide circle to reach the ball, and her elbow bends and straightens as she stretches out and pulls her hand back.
   Explain how the biceps and triceps work together to bend and then straighten her elbow.2 marks
2. A physiotherapist is explaining knee injuries to a young runner who twisted her knee during a cross-country race in Kenya. The scan shows no broken bones, but there is some damage to the soft tissues in and around the joint where her thigh bone meets her shin bone. Her Achilles tendon, which joins her calf muscle to her heel bone, is also sore.
   State the function of a tendon and explain why a torn Achilles tendon would stop the runner pushing off the ground with her foot.2 marks
3. A sports science student wants to find out whether eight weeks of daily biceps curls, lifting a 2 kg weight by bending the elbow, increases the number of curls a person can do in one minute. She tests six volunteers from her class at the start and again after the eight weeks. The mean number of curls rises from 18 to 27.
   State a testable hypothesis for this investigation with a scientific reason, and identify one variable that the student must control.3 marks