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
myocyte
anatomy
| Question | Answer |
|---|---|
| cell 2 cell junction that form mechanical n electrical connections between all cardiac contractile n conduction cells r called | gap junctions |
| myocyte/contractile cell membrane is called | sarcolima |
| filled with extracellular fluid and has extensions of plasma membrane penetrate into the cell n r open to the extracellular space | t-tubules |
| the t-tubules allow 4 the movement of large amounts of------into the cell where it moves into the sarcoplasmic reticulum | calcium |
| endoplasmic reticulum is called | sarcoplasmic reticulum |
| sarcoplasmic reticulum store ---------- obtained from the t-tubules | calcium |
| myosin, actin, troponin, tropomyocin | 3 contractile/motor proteins in the contractile cell |
| myosin is referred to as a --------- protein with small projections called bridges or ===== | thick, heads |
| thin, double | actin is referred to as ====== protein arranged in a ===== strand |
| actin proteins contain binding sites | 4 myosin heads |
| actin also includes the proteins | tropomyocin and troponin complex |
| there are 3 parts to troponin | troponin I,T, and C |
| troponin C | portion of the complex interacts with calcium |
| located n the groove between the 2 actin strands and covers the myosin binding sites on the actin | tropomyocin |
| sarcomere | a contractile unit of the actin n myosin proteins |
| a conduction cell | generates an action potential |
| the conduction cell === and causes=== gated sodium and calcium channels in the ===== to open | depolarizes, voltage, and gap junctions |
| sodium and calcium | moves into the contractile cells |
| na+ and ca++ causes the charge in the cell to become more==== and changes the ==== | positive, membrane potential |
| the change in membrane potential causes==== channels to open and tons of na+ moves into cell | voltage gated fast sodium |
| when na+ moves into cell membrane to on the action potential wave | depolarizes, also called phase 0 |
| during phase 0, k+ channels are | closed |
| tons of sodium move in the inside of the inner cell membrane become ---- and referred to as | positive, "overshoot" or phase 1 |
| positive charge in "overshoot" causes======= to open and ==== starts moving into contractile cells from ====== | voltage gated slow calcium calcium extracelluar fluid |
| phase 2 on the action potential wave is called | plateau |
| the calcium moving into the cell during the plateau phase causes a voltage change inside the cell. | causes voltage gated calcium channel in the sarcoplasmic reticulum to open and tons of calcium moves in the sarcoplasm |
| calcium binds to======which changes its shape/conformation | troponin c |
| the shape change rolls ==== off the myosin binding active sites on the==== | tropomyocin, actin |
| === hydrolysis causes the myosin heads to change their shape. they move onto the myosin binding sites on the ====, this process is called=== | ATP, actin bridging |
| as long as === and == are present the cross bridging continues | atp ca++ |
| the myosin heads shift and move | the actin forward |
| in relaxation ===and binds to the myosin heads and they detach from the ===;everything moves back to its original position to get ready for the next contraction | atp actin |
| which type of calcium movement creates the electrical currents in the cardiac myocyte | calcium movement across the sarcolemma |
| calcium movement out of the sarcoplasmic reticulum occurs by | diffusion, from higher to lesser concentration |
| calcium moves back into the sarcoplasmic reticulum by | active transport, lesser to higher concentration |
| calcium moves back into the sarcoplasmic reticulum during | diastole |
Created by:
t4achange
Popular Anatomy sets