Chapter 8-3 Flashcards
This is essential for maintaining posture
Tone
The third phase (period) of a muscle twitch contraction
Relaxation
These structures in the enlarged bulb of an axon provide energy to make ACh
Mitochondria
State of limpness in which muscle tone is lost
Flaccid
The cytoplasm of a muscle fiber
Sarcoplasm
This tissue is responsible for most of the heat production going in our body
Muscle tissue
Skeletal muscles have what?
Good blood supply and good nerve supply
All the muscle fibers must contract or relax together in what
Motor unit
The movement of these ions from outside the sarcolemma to inside causes an action potential to begin to move along
Na + ions
These ions are necessary to trigger muscle contraction
Ca 2 + ions
Dietary supplement that some studies show may result in more lifting power
Creatine
The storage form of glucose in our liver and muscles
Glycogen
The anaerobic process provides enough energy for 30-40 sec of maximal activity
Glycolysis
Does the length of actin and myosin filaments change during muscle contraction
No
Connective tissue that attaches muscle to bone
Tendon
The source of energy for muscle contraction
ATP
Another name for an action potential
Impulse
This is required by mitochondria in the aerobic production of energy for muscle contraction.
Oxygen
Another name for muscle cells
Fibers
The cell membrane of muscle cells
Sarcolemma
Alternate light and dark bands running through the sarcoplasm of a muscle cell
Striations
A single nerve fiber and the muscle fiber it supplies
Motor unit
A chemical necessary to transfer the nerve impulse to stimulate the muscle
Ach
The time between the application of a stimulus and the actual shortening of the muscle
Latent period
Two types of skeletal muscle contractions needed for normal body movements
Isotonic/Tetanus
The connection between a nerve fiber and a muscle fiber
NMJ
A brief contraction of all muscle fibers of a motor unit in response to a single stimulus
Twitch
Most of the Ca+2 is found here when a muscle fiber is relaxed
SR
A stiffening of the muscles after death due to Ca +2 leaking out of the sarcoplasmic reticulum
Rigor mortis
Name the major functions of muscles
Move. stabilize , organ vol. movement sub. Heat
The neurotransmitter released fro, the synaptic vesicles of neurons supplying skeletal muscle
ACH
The thick myofilament that has enlarged heads to form cross bridges
Myosin
