Ch. 8 Flashcards
(43 cards)
Skeletal muscle fiber is
a single muscle cell
Sarcolemma
Cell membrane of a muscle fiber
Sarcoplasm
Cytoplasm of a muscle fiber
Sarcoplasmic reticulum
Endoplasmic reticulum of a muscle fiber
What does sarcolemma have
a very special folded area celled a motor end plate
Motor end plate
where motor neuron form a connection with skeletal muscle fiber
what do skeletal muscle fibers contain
many nuclei and mitochondria
what are skeletal muscle fibers composed of
myofibrils
what are myofibrils composed of
myofilaments
what makes striations
alternation of dark and light pattern of skeletal muscle fiber
Parts of a skeletal muscle from largest to smallest
Whole muscle, Fascicles, Muscle fiber, Myofibrils, and Myofilament
Functions of connective tissue
- Separate skeletal muscles
- Physical protection
- Stores water and fat
- Reduces rate of heat loss
- Electrical insulation
Sliding filament model
Theory that explains how myofilaments in a skeletal muscle fiber are pulled over top each other to make a skeletal muscle contract
Twitch contraction
The single contraction and relaxation of a muscle fiber
Myogram
A record of a muscle contraction
Latent period
time between stimulation and contraction
Refractory period
muscle fiber losing excitability b/w stimulus
Calcium ions in muscle contraction
open gates of synaptic knob
Protien receptor in muscle contraction
ACH binds to it
Motor neuron in muscle contraction
send nerve impulse to muscle
Acetylcholine (ACH) in muscle contraction
sent from neuron to cell and transmit
How is a muscle impulse created
by a nerve impulse
Synaptic vesicles
in synaptic knob and it contains Neurotransmitters
Terminal cisternae of sarcoplasmic reticulum
has calcium inside and release, them where they bind to troponin
