Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
gg
uguclvgco
| Question | Answer |
|---|---|
| Muscles shorten. | contractility |
| Respond to stimuli. | excitability |
| Stretching. | Extensibility |
| Recoil to original length. | Elasticity |
| What do muscles help with. | Heat |
| Connective tissue sheath called | The epimysium |
| another connective tissue outside of the epimysium | Fascia |
| A muscle is composed of numerous visible bundles called | fascicles |
| Loose connective tissue that surrounds the fascicles | perimysium |
| Fasciculi are composed of single muscle cells called | Fibers |
| Each muscle cell is a cylindrical cell containing | several nuclei |
| Each fiber is surrounded by a connective tissue sheath called | the endomysium |
| Each cytoplasm of each fiber is filled with | myofibrils |
| Thin myofilaments | Actin myofilaments |
| Thick myofilaments | myosin myofilaments |
| Each sarcomere extends from one z line to | Another z line |
| The arrangement of actin and myosin give a | banded appearance |
| A darker central in each sarcomere | A band |
| H zone consists of | myosin |
| Myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the | M line |
| Outside of the cell is positively charged compared to the inside of the cell membrane which was negative | Resting membrane potential |
| The brief change in charge is | action potential |
| Nerve cells that carry action potentials to skeletal muscle fibers | motor neurons |
| thread like structure that extends across the fiber and cytoplasm. | myofibrils |
| sarcomere | Basic unit of structure in the muscle |
| z-line | one sarcomere extends to the other. |
| I band. | light area on each side of the z line, made up of actin. |
| neuromuscular junction | synapse |
| synapse | branches connecting to muscle, near the center of the cell. |
| motor unit | single motor neuron and all muscle fibers; many together form a muscle. |
| formation of neuromuscular junction | enlarged nerve terminal resting in the indentation of a muscle. |
| presynaptic terminal | enlarged nerve terminal |
| synaptic clef | space between presynaptic terminal and muscle cell. |
| postsynaptic terminal | muscle fiber |
| synaptic vesicles | located in presynaptic terminal secretes acetylcholine |
| acetylcholine | neurotransmitter secreted by the synaptic vesicles |
| acetylcholine is released into the synaptic clef through exocytosis when | when active potential reaches the nerve terminal |
| acetylcholinesterase | an enzyme that rapidly breaks down the acetylcholine that is released. |
| muscle contraction occurs in | actin and myosin myofilaments slide past each other causing a sarcomere to shorten which causes the muscle to shorten |
| sliding filament mechanism | sliding of myofilaments during contraction |
| in the sliding filament mechanism | H and I bands shorten but a band does not change |
| muscle twitch | contraction of an entire muscle as a response to stimulus that causes action potential to one or more muscle fibers. |
| threshold | a level of stimulus must be reached to get a response, but it won't happen if the threshold isn't reached. |
| lag phase | time between an application of a motor neuron and the beginning of contraction. |
| contraction phase | time of contraction |
| relaxation phase | time when the muscle relaxing. |
| tetany | muscle remains contracted without relaxing. |
| recruitment | increase of number of activated motor neurons |
| ATP | Energy needed for muscle contraction, made in the mitochondria. |
| ADP | ATP degenerates into a more stable phosphate. |
| creatine phosphate | High energy molecule for when ATP can't be stored at rest |
| anaerobic respiration | without oxygen |
| aerobic respiration | with oxygen more efficient |
| oxygen debt | amount of oxygen needed in chemical reactions to convert lactic acid into glucose. |
| muscle fatigue | The amount of ATP is used faster than it can be produced |
| isometric | equal distance, length of the muscle does not change only the tension of contraction. |
| isotonic | amount of tension is equal and constant but the length changes. |
| muscle tone | constant tension over a long period of time |
| fast twitch fibers | contract and fatigue quickly. |
| slow twitch fibers | contract slowly more resistant to fatigue. |
| origin | most stationary end of the muscle |
| insertion | end of the muscle undergoing the most movement |
| belly | point of the muscle in between the insertion and origin |
| synergists | muscles that work together to do specific movements |
| antagonists | muscles that work opposites together |
| prime mover | major movements |
| muscle names | descriptive, location size etc |
| occipitofrontalis | raises the eyebrows |
| orbicularis oculi | closes the eyelids |
| orbicularis oris | puckers lips |
| buccinator | flattens checks |
| zygomaticus | smiling muscle |
| levator labii superioris | sneering |
| depressor anguli oris | frowning |
| mastication | chewing |
Created by:
DavidTyler
Popular Biology sets