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A/p II
Chap 7 -Muscles
| Question | Answer |
|---|---|
| Another name for muscle cell? | Muscle Fiber |
| 2 Other names for skeletal muscle? | striated and voluntary |
| 2 Other kinds of skeletal muscle? | Cardiac & smooth |
| - dark bands where plasma membranes of adjacent cardiac fibers come in contact with each other | intercalated disks |
| Which muscle fibers are tapered at each end, have a single nucleus and lack cross stripes or striations of skeletal muscles | Smooth muscle |
| This muscle circulates blood? | Cardiac muscle |
| This type of muscle is responsible for moving food into and through the stomach and intestines. | smooth |
| -muscle attachment to the more stationary bone | Orgin |
| -attachment to the more moveable bone | insertion |
| -attach muscles firmly to bone | tendons |
| -fluid filled sacs that lie btwn some tendons and bones beneath them | bursae |
| form thick myofilaments | myosin |
| form thin myofilaments | actin |
| basic funtional unit of skeletal muscle | sacromere |
| basic building block of skeletal muscle | sacromere |
| 3 functions of the muscular system | movement, posture or muscle tone, heat production |
| -one thats mainly responsible for producting a particular movement | prime mover |
| -enables body to maintain body position bc of low strength continuous muscle contraction/doesn't move body parts | tonic contraction |
| -stimulates muscle fibers | motor neuron |
| -point of contact btwn the nerve ending and the muscle fiber | neuromuscular |
| single motor neuron with the muscle fibers | motor unit |
| min level of stimulation required to cause a fiber to contract | threshold stimulus |
| more sustained and steady response than a twitch | tetanic contraction |
| muscle produces movement at a joint | isotonic contraction |
| insertion end moves toward the point of origin | concentric contraction |
| muscle produces tension as it lengthens and thus the insertion moves away from the origin | eccentric contraction |
| when muscle does not shorten and no movement results internal tension increases | isometric contraction |
| muscles shrinking in mass | disuse atrophy |
| What type of muscles are these: orbicularis oculi orbicularis oris zygomaticus | facial muscles |
| what does orbicularis oculi control? | closes eye |
| What does orbicularis oris control? | kissing muscle |
| What does zygomaticus control? | Smiling muscle |
| What does masseter & temporal muscles control? | closing the jaw |
| What does sternocleidomastoid control? | flexes the head |
| What does trapezius control? | elevates the shoulders and extends the head |
| What muscle group do these muscles belong to? pectoralis major latissimus dorsi deltoid biceps brachii triceps brachii | control the upper extremities |
| Pectoralis major? | flexes upper arm |
| latissimus dorsi? | extends upper arm |
| deltoid | abducts upper arm |
| biceps brachii | flexes forearm |
| triceps brachii | extends forearm |
| rectus abdominis | flexes the trunk ( situps) |
| External and internal oblique and transversus | compresses abdomen |
| Muscle of expiration | intercostal |
| muscles of inspiration? | diaphragm |
| iliopsoas | flexes thigh |
| gluteus maximus | extends thigh |
| adductor muscles | adduct thighs |
| hamstring muscles | flex lower leg |
| quadriceps femoris | extend lower leg |
| tibralis anterior | dorsiflexes the foot |
| gastrocenmius | plantar flexes the foot |
| peroneus group | flexes foot |
Created by:
erikasmith28
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