Muscle part 1 Flashcards
Bone (osteoblasts) produce a hormone: _____
osteocalcin
What are the 7 functions of Muscles?
- Movement of skeleton
- Circulation of blood
- Digestion
- Respiration
- Vocalization
- Focusing of vision
- Temp regulation
What is the “muscle action”
can only pull (contract), NOT push
What is the gross structure of Skeletal Muscle?
Tendon - connects muscle to bone
Origin - more stationary and proximal attachment
Insertion - more distal and mobile attachment
The entire muscle is covered by _____
epimysium
Bundles of muscle fibers are grouped into _____ surrounded by _____.
fascicules
perimysium
Individual muscle fibers are surrounded by _____ and connective tissue, _____
sarcolemma
endomysium
Muscle cells are called _____ or _____ they are multinucleated
muscle fibers
myofibers
What are the types of muscles?
Striated - Cardiac & skeletal
Smooth - repro tissues, digestive tract & vasculature
Voluntary - skeletal
Involuntary - smooth
_____ - selective permeability allows differential ion balance between the extracellular fluid and the sarcoplasm
Resting membrane potential
Why is the resting membrane potential negative?
-95 mV?
What are the 3 types of proteins in myofibers?
- Contractile proteins (myosin)
- Regulatory proteins (tropomyosin)
- Structural proteins (titin)
What are the 2 types of myofilaments differing in size and structure?
- Actin - thin
2. Myosin - thick
_____ - center of sarcomere made up of thick filaments (center) and lateral regions made yup of thick and thin myofilaments
A-band
Center of the A-band is _____ which is the interconnection of thick myofilaments.
M-line
