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Anatomy Ch. 8!:)
| Question | Answer |
|---|---|
| Name and describe the three different layers of connective tissue in a muscle. | Epimysium- Wraps the muscle Permysium- Warps the fascile Edomysium- thin layer wrapping each cell (fiber) |
| Myofibrils are composed primarily of two protein filaments called _ and _ | Actin Myosin |
| a motor neuron and its associated muscle fibers | motor unit |
| Name and describe the parts of neuromuscular junction. | Motor neuron-transmits impulses from the centra lnervous system to an effector Motor end plate- specialized portion of muscle fiber memran at neuromuscular junction Neurotransmitters-Chemical that an axon end secretes on effector or neuron |
| transmits nerve messages across synapses | acetylcholine |
| the enzyme that decompeses of stuff | cholinesterase |
| bundles of muscular fibers are | myofibril |
| the more active your musclees are, the more body heat they release | true |
| network of membranous channels that surround and run parallel to the myfibrils | sacroplasmic reticulm |
| thick protein filaments with the A-bands | M-line |
| Protein filament that slides inward, toward the middle of a sarcomere, during a muscle contraction | permysuim |
| conducts a muscle impulse deep into a sarcoplasm, to the cisternae | transverse tubles |
| the segment of a myofibril between two Z-lines | Sacromere |
| What cause muscles to appear striated? | repeating units of sacromeres the light and dark |
| Neurotransmitters are stored in vesicles found in the... | moror neuron axoms |
| Creatine phosphate serves to do what? | supplies energry to regenerate ATP from ADP and phosphate |
| What chemical build-up causes muscle fatigue and muscle cramps? | lactic acid |
| minmal strength required to cause a contraction | threshold stimulus |
| it is the function of the ... in a muscles to supply energy for muscle fiber contractions | mitochondria |
| fibers dont contract partially, they either do or dont. what is this? | "all-or-none response" |
| a "partial, but sustained, contraction" descres muscle.. | antinic contraction |
| The ... appearance of skeletal muscles results from the arrangemenet of sarcomeres. | straited |
| Membranous channels that pass completely through a muscle fiber | tuble |
| .... % of energy released by cellular respiration is available for use by metabolic processes-- the rest is lost as body heat. | less than 50 |
| A substance called a ... crosses the synaptic cleft and stimulates the muscle fiber to contract. Specifically, muscles use ... to stimulate contraction | acetylcholine neurotransmitter |
| A .. can be described as cordlike and connection muscles to bones, while an .. would be described as a fibrous sheet of connective tissue connecting muscles to muscles. | Fascia Aponuerses |
| What model explains how muscles contract? | sliding-filament theory |
| the shrinkage of a muscle due to lack of use | atrophy |
| What molecules pass in and out of the sarcoplasmic reticulum as a muscle fiber contracts and realeases? | Cisternae |
| A bands are? I bands are? | dark..light |
| What are three types of muscles? Which are voluntary? Which are striated? | Skeletal-voluntary-striated Cardiac-involuntary-straited Smooth-involuntary-not straited |
| Where do you find the motor end plate? | end of motor unit |
| more and more fibers contract as intensity of stimulus increases | recruitment |
| Muscle fibers are mad of individual .... whcih are composed of .. and .. | myofibrils actin myosin |
Created by:
bkh_ctk