Muscular System Flashcards
types of epithelial tissue
squamous
cubodial
columnar
simple
1 layer
stratified
more than 1 layer
pseudostratified
nuclei are not well arranged
found in respiratory track
secrete mucus
produce mucus to track foreign pathogen
goblet cells
hair like structure that propel mucus
cilia
responsible for movement
contraction and relaxation
muscular system
consists of elongated cells that use ATP to generate force
muscular tissue
elongated cells are
muscle fibers or myocytes
Tissue that produces body movements, maintains posture, generates heat, provides protection
muscular tissue
-outer layer connective tissue
- dense irregular
epimysium
-fascicles (10-100 or more muscle fibers)
-dense irreg
perimysium
mostly reticular fibers connective tissue
endomysium
- striated, voluntary
-move bones
-alternating light and dark protein bands
-consciously or voluntarily controlled
skeletal muscle
-striated, involuntary
-only in the heart
-not consciously controlled
cardiac muscle
-non-striated, involuntary
-widely distributed in walls of hollow internal structures (airways, tracts, blood vessels)
-does not have striations
-style of contraction varies by the type of smooth muscle
smooth muscle
plasma membrane
sarcolemma
cytoplasm
sarcoplasm
endoplasmic reticulum
pumps Ca
sarcoplasmic reticulum
allows electrical signals or impulses
forms triads
T tubules
produces ATP
mitochondria
contains thick and thin filaments
myofibrils
myofibrils thin filaments
-actin, troponin, tropomyosin
relation of thin filaments
actin- myosin proteins
at rest, covered by tropomyosin
troponin hold tropomyosin
myofibrils thick filament
myosin
shaped like golf clubs
long shafts bundled to form thick filament
heads sticking out from bundle
myosin
relation of thick and thin filaments
myosin heads are attracted to actin molecules
basic unit of myofibril
sarcomere
narrow, plate-shaped regions of dense material
separate one sarcomere
z disc
dark, middle part of sarcomere
extends length of thick and parts of thin filaments
a band
lighter, less dense are of sarcomere
contains remainder of thin filaments
z disc passes through
i band
narrow region in center of each a band
contains thich filaments
h zone
region center in h zone
proteins
hold thick filaments
M line
