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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

Bones are ________. a. mineral reservoirs c. sites where blood cells b. skeletal muscle's \(\quad\) form (some bones only) partners d. all of the above

The human backbone _________. a. consists of vertebrae and intervertebral cartilage disks b. is S-shaped c. encloses the spinal cord d. all of the above

Bones move when _________ muscles contract. a. cardiac c. smooth b. skeletal d. all of the above

A ligament connects ____________. a. bones at a joint c. a muscle to a tendon b. a muscle to a bone d. a tendon to bone

The knee is a ___________. a. hinge-type synovial joint b. fibrous joint c. cartilaginous joint d. ball-and-socket type of synovial joint

A vertebrate skeletal muscle ____________. a. contracts in response to signals from a motor neuron b. pushes against and moves a bone c. is an involuntary muscle d. none of the above

A sarcomere shortens when _____________. a. thick filaments shorten b. thin filaments shorten c. both thick and thin filaments shorten d. none of the above

Release of ___________ reticulum allows actin and myosin filaments to interact. a. myoglobin c. calcium ions b. potassium ions d. collagen

Binding of ATP to __________ activates it and prepares this protein to take part in muscle contraction. a. actin c. collagen b. myosin d. myostatin