1abilities of skeletal muscles
contractility
excitability
extensibility
elasticity
2ability to shorten
contractility
3respond to stimulus x. of neu
excitability
4can stretch
extensibility
6nerve cells that carry action potentials to muscle fibers
motor neuron
7where nerve cell and muscle fiber meet
neuromuscular junction (synapse)
8end of nerve cell (axon)
presynaptic terminal
9muscle fiber membrane
postsynaptic membrane
10space between presynpatic terminal and postsynaptic membrane
synaptic cleft
11- in presynaptic terminal
- store and release neurotransmitters
synaptic vesicle
12- chemicals that stimulate or inhibit a muscle
fiber
neurotransmitter
13ex. of neurotransmitter
acetylcholine
14group of muscle fibers that motor neuron stimulates
motor unit
15Why is the inside of cell negative if K+ is positive?
K+ is able to DIFFUSE OUT of cell freely but other larger negative molecules cannot.
16person dies and no ATP is available to release cross-bridges
rigor mortis
17weakest stimulus needed to produce a response
threshold
18muscle contracts or doesn’t (no in between)
all or none law
19rapid contraction and relaxation of a muscle
twitch
20muscle remains contracted
tetanus
21amount of repetitions increases
isotonic
22constant tension over a long period of time
tone