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BIOL 223 Chapter 10-2
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List the three types of connective tissue of muscle.
epimysium
perimysium
endomysium
What structure is surrounded by the epimysium?
the entire muscle
The epimysium is comprised of what kind of tissue?
dense irregular connective tissue
What structure is surrounded by the perimysium?
a muscle fascicle
What type of tissue comprises the perimysium?
dense irregular connective tissue
What structures are surrounded by the endomysium?
individual muscle fibers (cells)
The endomysium is comprised mainly of _______ fibers.
reticular
At the ends of muscles, the three connective tissue layers combine to form what two things?
tendons
aponeurosis
What cells act as embryonic percursors to muscle?
myoblasts
True or False: Myoblasts will fuse together to form muscle fibers.
True
False
True
What is the relationship between the number of myoblasts and the number of nuclei in a mature muscle fiber?
each myoblast contributes one nucleus
When does mitosis in muscle fibers stop?
prior to birth
What is the function of satellite cells on the muscle?
aid in tissue repair
Skeletal muscle is comprised of smaller units known as:
fascicles
Muscle fascicles are comprised of smaller units known as:
muscle fibers
Muscle fibers are comprised of individual units called:
myofibrils
List the structural units of muscle from largest to smallest.
muscle (bicep, rectus abdominis)
fascicle
fiber
myofibril
What is the main function of sarcoplasmic reticulum?
to store calcium ions
When the transverse tubules depolarize the muscle, the sarcoplasmic reticulum releases calcium ions from what structure?
terminal cisternae
What anchors myosin filaments to the Z line?
titin
List the three functions of myosin heads discussed in lecture.
binds to active sites on actin molecules
pivots to allow for muscle contraction
can act as an ATPase
On which actin structure will you find the active sites?
G-actin (globe shape)
Two strands of G-actin wind together in a sort of double helix to form:
F-actin
How does tropomyosin function during muscle contraction?
covers the active sites during rest
configuration change uncovers active sites to allow for contraction
What will the 1st subunit of Troponin bind to?
G actins
What will the 2nd subunit of Troponin bind to?
tropomyosin
What will the 3rd subunit of Troponin bind to?
calcium ions
Which muscle fiber proteins are contractile proteins?
actin
myosin
What role do contractile proteins play?
actively shorten/contract the muscle
Which proteins are regulatory proteins?
tropomyosin
troponin
List the four structural proteins discussed in lecture.
titin
alpha actinin
myomesin
nebulin
What structural protein contributes to muscle elasticity and attaches the thick filaments to the Z line?
titin
What structural protein makes up the Z line?
alpha actinin
What structural protein makes up the M line?
myomesin
What structural protein winds around the actin filaments, holds it together, and attaches it to the Z line.
nebulin
Author
christophertkennedy
ID
113576
Card Set
BIOL 223 Chapter 10-2
Description
Study Cards for Chapter 10 BIOL 223 CSN
Updated
2011-11-01T04:16:57Z
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