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Chapter Questions
The coelom of an earthworm, the muscular foot of a clam, and the trunk of an elephant can all be considered what type of skeleton?a. exoskeletonb. hydrostaticc. jointedd. longitudinal
Which type of animal has an exoskeleton?a. arthropodb. cnidarianc. earthwormd. primate
Which of the following characteristics is not an advantage of a jointed vertebrate endoskeleton?a. allows flexible movementb. grows with the animalc. guards against dessicationd. protects vital internal organs
The human skeletal system does nota. produce blood cells.b. store minerals.c. help produce movement.d. store fat.e. produce body heat
Spongy bonea. is a storage area for fat.b. contains red bone marrow, where blood cells are formed.c. lends strength to bones.d. Both b and c are correct
Which of the following is not a bone of the appendicular skeleton?a. the scapulab. a ribc. a metatarsal boned. the patellae. the ulna
The vertebrae that articulate with the ribs are thea. lumbar vertebrae.b. sacral vertebrae.c. thoracic vertebrae.d. cervical vertebrae.e. coccyx.
ulnamatch each bone to the location in the keya. upper armb. forearmc. pectoral girdled. pelvic girdlee. thighf. lower leg
tibiamatch each bone to the location in the keya. upper armb. forearmc. pectoral girdled. pelvic girdlee. thighf. lower leg
claviclematch each bone to the location in the keya. upper armb. forearmc. pectoral girdled. pelvic girdlee. thighf. lower leg
femurmatch each bone to the location in the keya. upper armb. forearmc. pectoral girdled. pelvic girdlee. thighf. lower leg
In a muscle fiber,a. the sarcolemma is connective tissue holding the myofibrils together.b. the sarcoplasmic reticulum stores calcium.c. both myosin and actin filaments have cross-bridges.d. there is a T system but no endoplasmic reticulum.e. All of these are correct.
According to the sliding filament model, when muscles contract,a. sarcomeres shorten.b. myosin heads break down ATP.c. actin slides past myosin.d. the H zone disappears.e. All of these are correct.
Nervous stimulation of musclesa. occurs at a neuromuscular junction.b. involves the release of ACh.c. results in impulses that travel down the T system.d. causes calcium to be released from the sarcoplasmic reticulum.e. All of these are correct
Acetylcholinea. is active at somatic synapses but not at neuromuscular junctions.b. binds to receptors in the sarcolemma.c. precedes the buildup of ATP in mitochondria.d. is stored in the sarcoplasmic reticulum.e. Both b and d are correct.
Label this diagram of a muscle fiber, using these terms: myofibril, Z line, T tubule, sarcomere, sarcolemma, sarcoplasmic reticulum.