muscular system Flashcards
produced by an intrinsic system of musculature
movement
facilitated by nerve impulses at nerve endings
muscle contraction
critical to important activities like fedding and walking
coordinated movement of muscles
are made up of contractile units called myosin filaments
muscles
are striated fibers that makes up the muscles
myosin filaments
light bands
isotropid
dark bands in the muscle
anisotropid
presence of numerous nerve endings from a single axon
multiterminal innervation
myofibrils situated in a matrix of multinucleated cytoplasm
fibers
have lateral projections which interlink with actin filaments
myosin filaments
converts chemical energy into mechanical work
occurs in antagonistic pairs (FLEXOR AND EXTENSOR)
Muscles
different types of insect muscles
typical (bee larva)
microfibrillar (legs of orthoptera)
lamellar or tubular (direct flight muscles)
fibrillar
type of muscle that has slightly differentiated fibrils
typical
type of muscle that have closely packed fibrils that are interspersed with columns of mitochondria
mmicrofibrillar
direct flight muscles
nuclei found only along the central portion forming a column
lamellar or tubular
of large diameter fibril surrounded by sarcolemma
Found in indirect flight muscles
fibrillar
categories of insect muscles
visceral muscles
segmental muscles
appendage muscles
occur in circular, longitudinal or oblique bands around the digestive tract
produces PERISTALTIC MOVEMENT
Visceral muscles
series of bands that connect the body segments
connects the tergites and sternites
segmental muscles
muscle attached to or within the appendages
appendage muscles
basic mode of locomotion in insects on land
TRIPOD MANNER for adult insects
walking
basic mode of locomotion for worm shaped immatures
longitudinal and dorsoventral muscles oppose each other
crawling
abdominal segments that assist in anchoring the abdomen
fleshy prolegs
only adults can accomplish this (except mayyflies)
flying
