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
ap chap 9
chap 9 muscles
| Question | Answer |
|---|---|
| during muscle contration, myosin cross bridges attach to which active sites? | actin filaments |
| which of the following is not a usual result of resistance exercise? | increase in the number of muscle cells |
| the strongest muscle contrations are normall achieved by____ | increasing the stimulation up to the maximal stimulus |
| smooth muscle is characterized by all of the following except___ | there are more thick filaments than thin filaments |
| muslce tone is____ | a state of sustained partial contraction |
| the giant protein titin maintains the organization of the ___ assisting in muscle stretching | a band |
| which of the following is not a role of ionic calcium in muscle contration? | activates epinephrine released from adrenal gland |
| the sliding filament model of contration involves____ | actin and myosin sliding past each other and partially overlapping |
| the main effect of the warm up period of athletes as the muscle contrations increase in stregth is to___ | enhance the availability of calcium and the efficency of enzyme systems |
| which of the following surronds the individual muscle cell? | endomysium |
| whena muscle is unable to respond to stimuli temporarily it is in which of the following periods? | refractory period |
| what is the role of calcium ions in muscle contration? | bind to regulatory sites on troponin to remove contraction inhibition |
| what structure in skeletal muscle cells functions in calcium storgae? | sarcoplasmic reticulum |
| rigor morrtis occurs because____ | no atp is avaliable to release attaced actin and myosin molecules |
| which of the following is not a way muscle contrations can be graded? | changing the type of muscle fibers involved in the contration |
| creatine phospate functions in the muscle cell by____ | storing energy that will be transferred to adp to resynthesize atp |
| what part of the sacrolemma contains acetylcholine receptors? | motor end plate |
| which of the following is the correct sequence of events for muscle contractions? | motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from sr, atp drven power stroke, sliding myofilaments |
| what is the role of tropmyosin in skeletal muscles? | tropomyosin serves as a contration inhibitor by blocking the myosin binding sites on teh actin molecules |
| which muscle cells have the greatest ability to regenerate? | smooth |
| what is the functional unit of skeletal muscle called? | a carcomere |
| smooth muscles that act like skeletal muscles but are controlled by the autonomic nerves and hormones are | multiunit muscles |
| muslce tissue has all of the following properties except____ | secretion |
| during vigorous exercise there may be insufficient oxygen available to completely break down pyruvic acid fro energy. as a result the pyruvic acid is converted to___ | lactic acid |
| immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the___period during which the vents of excitation contraction coupling occur | latent |
| which of the following are composed of myosin | thick filaments |
| the warm up period required of athletes in order to bring their muscles to peak performance is called____ | treppe |
| fatigued muscle cells that recover rapidly are the products of | intense exercise of short duration |
| what is the most distinguishing characteristic of muscle tissue? | the ability to transform chemical energy into mechanical energy |
| the muscle cell membrane is called the | sarcolemma |
| the mechanism of contraction in smooth muscle is different from skeletal muscle in taht ____ | the site of calcium reguation differs |
| hypothetically if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ___ | no muscle tension could be generated |
| which of the following statments is true | striated muscle cells are long and cylindrical with many nuclei |
| which of the choices below does not descrive how recovery oxygen uptake restores metabolic conditions? | increases the level of lactic acid in the muscle |
| the contratile units of skeletal muscles are | myofibrils |
| which of the following is a factor taht affects the velocity and duartion of muscle contration | load on the fiber |
| which of the following statmetns is most accurate | muscle tension remains relatively constant during iso tonic contration |
| the term aponeruosis refers to___ | a sheetlike indirect attachment to a skeletal element |
| after nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stiulate contrations | acetylcholinesterase destroying the ACh |
| myglobin___ | stores oxygen in muscles cells |
| excitation contration coupling requires which of the following substances? | ca2 and atp |
| what is the functional role of the t tubules? | enhance cellular communication during muscle contraction |
| which of the following describes the cells of single unit visceral muscle? | they exhibit spontaneous action potentials |
| which of the following is true about smooth muscle contraction? | certain smooth muscle cells can actually divide to increase their numbers |
| which of the following would be recruited later in muscle stimulation when contratile strength increses | motor units with alrger less excitable neurons |
| what controls the force of muscle contraction? | multimotor unit summation |
| which of the following staments is false or incorect? | caridac muscle fibers depend mostly on anaerobic cellular respiration to generate atp |
| the oxygen biding protein found in muscle cells is____ | myoglobin |
| what produces the striations of skeletal muscle cell? | the arrangement of myofilaments |
| in an isotonic the muscle___ | changes in lenth and moves the "load" |
| an anerobic metabolic pathway that results in the production of two net atp per glucose plus two pyruvic acid molecules is___ | glycolysis |
| the major function of the sarcoplasmic reticulum in muscle contration is to___ | regulate intracellular calcium concentration |
| three discrete types of muscle fivers are identified on the basis of their size, speed and endurance which of the following athletic endeavors best represents the use of red fibers | a long relaxing swim |
| of the following muscle types which has only one nucleus no sarcomeres and rare gap junctions | multiunit smooth muscle |
| most skeletal muscle contain | a mixture of fiber types |
| what does oxygen deficit represent? | the difference bewtween the amount of oxygen needed for totally aerobic muscle activity and the amount actually used. |
Created by:
1353843965