A&P 1 Chapter 8

Functions of muscle include

• the heartbeat. e include

• muscle tone. e include

• production ofheat. clude

• moving bodyparts. clude

• All of the choices are correct.

The moveable end of a muscle is attached at its

• origin le end of a muscle is attached at its

• fulcrum e end of a muscle is attached at its

• insertion

• motor endplate

• source

Compared to skeletal muscle, smooth muscle

• contracts more slowly and relaxes more slowly

• contracts moreslowly and relaxes more rapidly

• contracts morerapidly and relaxes more slowly

• contracts morerapidly and relaxes more rapidly

• is under voluntarycontrol

The term "muscle" can refer to

• a cell

• a tissue

• an organ

• All of the choices are correct.

Correctly order the sequence of events that occur in muscle contraction.

• Ca released, actin sites exposed, ADP and P release from myosin, myosin heads bind actin, ATP binds to myosin, ATP split

• ATP binds to myosin, ATP split, Ca released, actin sites exposed, myosin heads bind to actin, ADP and P release from myosin

• ADP and P release from myosin, ATP split, Ca released, myosin heads bind to actin, actin sites exposed, ATP binds to myosin

• Ca released, actin sites exposed, myosin heads bind to actin, ADP and P release from myosin, ATP binds to myosin, ATP split

• Myosin heads bind to actin, actin sites exposed, ATP split, ATP binds to myosin, Ca released, ADP and P release from myosin

Multiunit smooth muscle

• tends to displayrhythmicity

• responds tostimulation by neurons and certain hormones

• None of thechoices apply. s and certain hormones

• is composed ofsheets of muscle cells n hormones

• occurs in thewalls of the stomach and intestines

A sarcomere is best described as _______

• a part of the sarcoplasmic reticulum

• a group of fascicles

• a group of myofibrils

• a unit within a myofibril

• All of the choices are correct.

Myofibrils are composed primarily of

• actin and myosin

• ATP and ADP

• troponin andtropomyosin

• fascia andtendons

• perimysium and endomysium

A motor unit typically includes

• muscle fibersonly

• motor neuronsonly

• several motorneurons and one muscle fiber

• one motor neuron and several muscle fibers

• several motorneurons and several muscle fibers

The muscle primarily responsible for opposing a particular action is called the

• antagonist

• prime mover

• synergist

• agonis

• origin