Muscles Flashcards
(79 cards)
how many skeletal muscles’ do humans have
~660 skeletal muscles
muscle mass in adults, for female and male
females 13-30 kg;
males 18-40 kg
what is the average amount and length and diameter of muscle fibres
~100,000 fibres
D: 10 -100 micrometre
L: 1-500 mm (Harris et al 2005)
how does muscle determine identity
through voice
what is the skeletal muscle a source of and what process does it help
source of amino acids, homeostasis…
different muscle fibres shape: pectoralis major
convergent
different muscle fibres shape: orbicularis oris
circular
different muscle fibres shape: deltoid
multipennate
different muscle fibres shape: sartorius
parallel
different muscle fibres shape: biceps brachii
fusiform
different muscle fibres shape: extensor digitorum longus
unipennate
different muscle fibres shape: rectus femoris
bipennate
role on connective tissue
maintains integrity of
the muscle and is important in
transmission of force
roles of tendons
Muscles connect to bones by tendons
role of epimysium
Muscles are enclosed by epimysium
(connective tissue)
what is a muscle fascicles and perimysium
Groups of fibres form muscle fascicles
surrounded by perimysium
what is a endomysium
Each muscle fibre is enclosed by
endomysium which consists of extracellular matrix (made of collagen)
how do Structural intracellular proteins of muscle
fibre link to endomysium and why are they important
Structural intracellular proteins of muscle
fibre link to the endomysium via focal
adhesions (important for force
transmission)
what are sarcolemma
Muscle fibres (10-100
μm) are covered by
sarcolemma (≈7.5 nm
thick
what are t tubules
T-tubules are invaginations
of sarcolemma
what is Sarcoplasmic reticulum
is a network of tubes
surrounding myofibrils
what is Sarcoplasm
is fluid
enclosed within the fibre
what are myofibrils
( ~1 μm) are
packed bundles of
myofilaments running along
the fibre
name 2 types of myofilaments
thick (darker) and thin (lighter) filaments