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Magazine Problem 1
A hydrostatic skeleton consists of ________. a. a fluid in an enclosed space b. hardened plates at the surface of a body c. internal hard parts d. none of the above
Problem 2
Bones are ________. a. mineral reservoirs b. skeletal muscle's partners c. sites where blood cells form (some bones only) d. all of the above
Problem 3
The human backbone ________. a. consists of vertebrae and intervertebral cartilage disks b. has a shape adapted to upright walking c. encloses the spinal cord d. all of the above
Problem 4
Bones move when ________ muscles contract. a. cardiac b. skeletal c. smooth d. all of the above
Problem 5
A ligament connects ________. a. bones at a joint b. a muscle to a bone c. a muscle to a tendon d. a tendon to bone
Problem 6
Binding of ATP ________ to activates it and prepares it to take part in muscle contraction. a. actin b. myosin c. collagen d. bone
Problem 7
A sarcomere shortens when ________. a. thick filaments shorten b. thin filaments shorten c. both thick and thin filaments shorten d. none of the above
Problem 8
Release of ________ from intracellular storage allows actin and myosin to interact. a. sodium ions b. potassium ions c. calcium ions d. collagen
Problem 9
ATP for muscle contraction can be formed by ________ . a. aerobic respiration b. lactate fermentation c. creatine phosphate breakdown d. all of the above
Problem 10
A motor unit is ________. a. a muscle and the bone it moves b. two muscles that work in opposition c. the amount a muscle shortens during contraction d. a motor neuron and the muscle fibers it controls
