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
ch.6
| answer | question |
|---|---|
| contractility | the ability of skeletal muscle to shorten with force. |
| excitability | the capacity of skeletal muscle to respond to a stimulus. |
| extensibility | the ability to be stretched. |
| elasticity | ability to recoil to their original resting length after they have been stretched. |
| what do muscles help produce? | Heat, essential for maintenance of normal body temperature. |
| epimysium | (skeletal muscle) surrounded by connective tissue sheath. |
| fascia | another connective tissue located outside the epimysium.(surrounds and separates muscles). |
| perimysium | muscle composed of visible bundles called fasciculi (fascicle). |
| fibers | single muscle cell. |
| endomysium | (fiber surrounded) by connective tissue sheath. |
| myofibrils | threadlike structure that extends from one end of the fiber to the other. |
| actin myofilaments | thin myofilaments, they resemble 2 minute strands of pearls twisted together. |
| myosin myofilaments | thick myofilaments. (resemble bundles of minute golf clubs) |
| sarcomeres | joined end to end to form the myofibril. |
| what is the sarcomeres job? | structural and functional unity of the muscle. |
| resting membrane potential | charge difference across the membrane. |
| action potential | reversal back of a charge. |
| motor neurons | nerve cells that carry action potentials to skeletal muscle fibers. |
| neuromuscular junction | branch that connects to the muscle. |
| synapse | center of a cell. |
| motor unit | a motor neuron |
| motor neuron | nerve cells that carry skeletal muscle fibers |
| presynaptic terminal | enlarged nerve terminal |
| synaptic cleft | the space between the presynaptic terminal and the muscle cell |
| postsynaptic terminal | muscle fiber |
| synaptic vesicles | each presynaptic terminal contains this |
| acetylcholine | secrete neurotransmitter |
| acetylcholinesterase | breaks down enzymes |
| sliding filament mechanism | sliding of actin during contraction |
| muscle twitch | contraction of an entire muscle |
| threshold | muscle fiber that will not respond to stimulus |
| all or none response | this phenomenon is called (all or none response) |
| lag phase | motor neuron and beginning of an contraction |
| contraction phase | the time of a contraction |
| relaxation phase | time of which muscles relax |
| tetany | where muscles remain contracted with out relaxing |
| recruitment | the increase in number of motor units being activated |
| energy requirements (4 of them) | ATP, ATP, ATP, ADP |
| creatine phosphate | necessary for muscle cells |
| anaerobic respiration | without oxygen |
| aerobic respiration | with oxygen (more efficient) |
| oxygen debt | amount of oxygen needed in chemical reactions |
| muscle fatigue | results when ATP is used during muscle contraction faster than it can be produced in the muscle cell |
| isometric | equal distance |
| isotonic | equal tension |
| muscle tone | keeps head up and back straight |
| fast twitch fibers | contract quickly and fatigue quickly |
| slow twitch fibers | contract more slowly |
| origin | (head) most stationary end of a muscle |
| insertion | end of the muscle undergoing the greatest movement |
| belly | portion of the muscle between the origin and the insertion |
| synergists | muscles that work together to accomplish specific movements |
| antagonists | muscles that work in opposition to one another |
| prime mover | one muscle plays the major role in accomplishing the desired the desired movement |
| smooth muscle | muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut or other internal organs |
| fascicle | a bundle of structures, such as nerve or muscle fibers or conducting vessels in plants. |
| cardiac muscle | heart muscle, one of the three major types of muscle, the others been skeletal and smooth |
| sarcolemma | the fine transparent tubular sheath that envelopes the fibers of skeletal muscles. |
| sarcomere | a structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer |
| Occipitofrontalis | raises the eyebrows |
| Orbicularis oculi | closes the eyelids and causes “crows feet” wrinkles in the skin at the lateral corners of the eye. |
| Orbicularis oris | puckers the lips |
| Buccinator | flattens the cheeks. Trumpeter’s muscle. |
| two types of mouth muscles | Orbicularis oris and buccinator are the kissing muscles. |
| Zygomaticus | smiling muscle. |
| Levator labii superioris | sneering |
| Depressor anguli oris | frowning |
| Mastication | chewing |
| 4 pairs of mastication muscles: | 2 pair of pterygoids, temporalis, and masseter |
| Intrinsic Tongue Muscles | change the shape of the tongue |
| Extrinsic Tongue Muscles | move the tongue |
| Neck Muscle | Sternocleidomastoid |
| Sternocleidomastoid | lateral neck muscle and prime mover. Rotates and abducts the head |
| Erector spinae | group of muscles on each side of the back. Responsible for keeping the back straight and the body erect |
| Most involved in breathing | External intercostals – elevate the ribs during inspiration. Internal intercostals – contract during forced expiration. Diaphragm |
| External intercostals | elevate the ribs during inspiration |
| Internal intercostals | contract during forced expiration |
| Diaphragm | accomplishes quiet breathing |
Created by:
Heathermarie17
Popular Anatomy sets