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
A&P muscular system
Stack #20489
| Question | Answer |
|---|---|
| job of tropomyosin | covers actin's binding site |
| has a myosin binding site | actin |
| have heads (crossbridges) | myosin |
| holds tropomyosin in place | troponin |
| covers binding site of actin | tropomyosin |
| excitation-contraction coupling | receiving and propagating a stimulus to contraction |
| the contraction cycle | when stimulated, crossbridges attach to myosin binding site on actin |
| job of crossbridges | act like tiny ratchets to propel thin filaments toward center of sarcomere |
| location of sarcomere | Z line to Z line of myofibril |
| NMJ | area f contact between neuron and sarcolemma |
| synapse | where nerve cell communicates with other cell through release of Ach |
| synaptic gap | space between synaptic terminal and sarcolemma |
| synaptic end bulbs | expanded ends of neuron that fit into motor end plate |
| motor end plate | area on sarcolemma where acetylcholine receptors are found |
| Acetylcholine (Ach) | neurotransmitter (chemical messenger) released at the NMJ |
| When Ach binds to receptors at motor end plate, muscle becomes | more permeable to sodium |
| ATP | the main energy currency in living cells; usd to transfer the chemical energy needed for metabolic reactions |
| where does the energy for muscular activity come from? | ATP |
| ATP is needed for what in muscle metabolism? | energy for conractions, to detach cross bridges, to pump calcium ions back into the SR |
| in order for muscle contractions to continue, ___ needs to be regenerated | ATP |
| where is ATP made? | mitochondria |
| the SR stores this | Calcium |
| at rest, active sites of actin are covered by | tropomyosin |
| the ___contains vesicles filled w/ Ach | synaptic end bulb |
| contains receptors for Ach | motor end plate |
| at rest, tropomyosin held in place by | troponin |
| synaptic cleft | space between end bulb and motor end plate; where Ach is released for diffusion |
| motor unit | single neuron and all the muscle fibers it controls |
| isotonic | muscle changes in length as tension rises |
| isometric | does not change lengthen as tension rises |
Created by:
ShellyA&P
Popular Anatomy sets