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what do the cells of excitable tissues contain?
plasma membrane that can alter electrical potential from the normal resting
(muscle types) which is the longest cell type?
(muscle types) is the skeletal muscles under voluntary or involuntary control?
how does a muscle acquire a straited look?
it has overlapping proten that give it a banded appearance
(muscle types)is smooth muscle striated?
(muscle types) description of smooth muscle cells (2)
(muscle types) what appears between the fibers of cardiac muscle?
- intercalated disks
- *gap junctions
(muscle types) cardiac muscle- what is significant about the way the fibers are placed?
they are striated but the fibers are branching
muscle characterisitcis) Excitability
can conduct an action potential in response to a stimulus
muscle characterisitcis) contractility
- can shorten and lengthen
- *generates force
- *differs based on their location and function
muscle characterisitcis) extensibility
can be stretched beyond resting length when relaxed
muscle characterisitcis) elasticity
resumes original length
muscles functions) 4 functions of muscles
- -produce movement
- *all 3 muscle types do this
- -maintain posture
- *skeltal muscles
microscopic anatomy) What is a muscle cell?
- elongated cell known as a fiber
- *runs the length of a muscle
microscopic anatomy) what else besides the endomysium suround a muscle cell?
- *plasma membrane
microscopic anatomy) what does the sarcolemma contain? (2)
sarcoplasm (cytoplasm) and organelles
microscopic anatomy) what 6 things does a muscle cell contain?
microscopic anatomy)(muscle cell's oraganelles and proteins) nuclei (2)
-they have multiple
-located on the peripheral
microscopic anatomy)(muscle cell's oraganelles and proteins) mitochondria
- they have numerous of mitochondria
- *they supply the enrgy
microscopic anatomy)(muscle cell's oraganelles and proteins) myoglobin
protein that stores oxygen
microscopic anatomy)(muscle cell's oraganelles and proteins)glycosomes
glycogen storage granules
microscopic anatomy)(muscle cell's oraganelles and proteins) sarcoplasmic reticulum
- modified endoplasmic reticulum
- *they surround the myofibrils
microscopic anatomy)(muscle cell's oraganelles and proteins) myofibrils
- -contractile organelle
- *make up 80% of the skeletal muscle cell
(within myofibril) 2 types of myofilaments
thick and thin
what are myofilaments
rods within a muscle cell
(within myofibril) what is a thick filament made up off?
multiple myosin molecules are bvundled together to create this filament
(within myofibril) what protein makes up the thick filament?
(within myofibril) description of myosin
long rope like tail and 2 heads
(within myofibril) what 3 proteins make up the thin filaments? (3)
banding pattern) what is the A-band?
is teh length of the thick filament
banding pattern) what is the I-band? (2)
-area that only contains thin filament
-there is no overlapping of thick and thin at this point
banding pattern) What is H-zone?
no thin filament here
banding pattern) what is M-line? (2)
-M line bisects the H zone
-this is where we have end to end attachment of filaments
banding pattern) Z-line? (2)
-bisects the I band
-end to end attachment of thin filaments
what contributes to the banding pattern?
the specific overlap of thick and thin filaments
banding pattern) where is the sarcomere?
area between the 2 Z lines
(elastic filaments) do these participate in contraction?
(elastic filament) function
supportive and structural proteins that provide integrity to sarcomere and myofibril
(elastic filament) titin- where is it located?
between z-line and thick filament
(elastic filament) two types?
(elastic filament) location of nebulin
runs along thin filament
(elastic filament) nebulin- function?
provides integrity to thin filament
(elastic filament)what wraps around the nebulin?
(elastic filament) titin- what ability does it provide the skeletal muscle with?
(intracellular tubules) what is a triad?
-t tubule + 2 terminal cisternae
(intracellular tubules) what are the 2?
(intracellular tubules) what is terminal cisternae?
part of the sarcoplasmic that doesnt branch out into networks
(intracellular tubules) T-tubules- where do they extend from?
from plasma membrane and wrap around each of myofibril
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