Muscle Anatomy Flashcards
Two types of muscle
striated and smooth muscle
Two types of striated muscle
skeletal and cardiac muscle
The skeletal muscle is in charge of…
- movement
- maintain posture
- nutrition reservoir
- regulate energy balance
Myofibril is made up of…
myofilament
What membrane surrounds myofibril?
sarcoplasm
What surrounds muscle fiber (cell)?
Endomysium
What three things the muscle fiber is made up of?
- sarcoplasm
- myofibril
- myofilament
What is surrounded with endomysium?
Muscle fiber
Discribe muscle fiber
- fundamental organization
- surrounded with endomysium
- surrounded by sarcolemma membrane
- only ONE neuromuscular junction
- contains ~~35 nuclei / mm in length
The muscle fiber contains…
- bath myofibrils (80-87%)
- nuclei
- SR - sarcoplasmic reticulum (1.2-3.8%)
- mitochondria (1.1-5.2%)
- lysosomes
- Golgi complex
what is sarcolemma?
membrane surrounding muscle fiber
Triad is made up of…
- T-Tubules (transverse tubules)
- SR (sarcoplasmic reticulum)
Transverse tubules is part of…?
sarcolemma invagination
what can be found on the sarcolemma?
- T-Tubules
- Satellite cell
List components in the muscle cell
- myofibril
- muscle fiber nuclei
- sarcolemma
- transverse tubules
- satellite cell
- basal lamina
- endomysial reticular fibers
- capillary endothelial cells
- endomysial collagen
- elastin fibers
- fibroblast
What makes up one sarcomere?
- Z disk/line
- M line
- Thick filaments
- Thin filaments
What is part of the I band in the sarcomere?
Z disk and thin filaments
What is part of the A band in the sarcomere?
M line, thin filaments, and thick filaments
What is part of the H zone?
M line and Thick filaments
Skeletal muscle is made up of (heterogeneous / homogeneous) muscle fiber and has ____ and ____ properties.
Heterogenous
Biochemical and Physiological properties
Two types of energy metabolism for Skeletal muscle?
Oxidative and glycolytic
Contraction speed slow = ______
Contraction speed fast = ______
(Oxidative or Glycolytic)
slow = oxidative fast = glycolytic
What is the order of myogenesis?
Mesodermal progenitor cell Presumptive myoblast myoblast myotube muscle fiber
What are satellite cells?
- STEM CELLS (muscle progenitor cell)
Where is the satellite cell located on the muscle cell?
Outside the sarcolemma and inside the basal lamina
Satellite cells divide during ____ or ____.
Regeneration or hypertrophy
What does the satellite cell do during postnatal muscle growth?
Divide and provide nuclei
What occurs during postnatal muscle growth?
muscle cell numbers are determined at around birth due to hypertrophy
during the postnatal muscle growth, the amount of muscle cell numbers are determined due to _____.
NOT __________
HYPERTROPHY
HYPERTROPHY
HYPERTROPHY
not due to hyperplasia
What are the muscle difference of the long distance runner and a sprinter?
long distance = slow, type I
sprinter = fast, type II
Describe Type 1 muscle fiber
Primarily used for prolonged activity
red in color
slow oxidative reaction
Describe type 2 muscle fiber
primarily used for quick bursts of exercise
white in color
fast glycolytic reaction
