ANAPHY M5 Flashcards
Consists of elongated cells called muscle fibers or
myocytes
MUSCULAR TISSUE
MUSCULAR TISSUE FUNCTIONS
● Produces body movements
● Maintains posture
● Generates heat
● Protection
● Consists of long, cylindrical striated fibers
SKELETAL MUSCLE TISSUE
alternating light and dark bands within fibers that are visible under a light microscope
STRIATIONS
● Length varies from few cm in short muscles to
30-40 cm in longest muscles
SKELETAL MUSCLE TISSUE
● Consists of branched, striated fibers
● Attached end to end by intercalated discs
● Traverse thickenings of plasma membrane which
contain desmosomes and gap junctions
CARDIAC MUSCLETISSUE
strengthen tissue and hold fibers
together during vigorous contractions
DESMOSOMES
provide route for quick conduction of electrical signals (muscle action potentials) throughout heart
GAPJUNCTIONS
● Consists of nonstriated fibers
● Small spindle-shaped cell; thickest in the middle,
tapering at each end
● Connected by gap junctions
SMOOTHMUSCLETISSUE
● Canproduce powerful contractions due to many
muscle fibers contracting in unison
● Absence of gap junctions: muscle fibers contract
individually (e.g. iris of eye)
SMOOTHMUSCLETISSUE
● Location: nervous system
NERVOUSTISSUE
NERVOUS TISSUE consists of two principle types of cells:
neurons and neuroglia
NERVOUS TISSUE Function
Function:
● Sensitivity to various stimuli
● Convert stimuli to nerve impulses
● Conduct nerve impulses to other neurons, muscle
fibers, or glands
● Alsocalled nerve cells
● Sensitive to stimuli
● Convert stimuli into electrical signals (nerve action
potentials) and conduct these action potentials to
other neurons, muscle tissue, or glands
NEURON
Parts of a Neuron
● CELLBODY-contains the nucleus and other
organelles
● DENDRITES-tapering, highly branched, small
short cell processes; input portion of neuron
● AXON-single, thin, cylindrical process that may be
very long; output portion of a neuron
