T tubule - Revision history

Nnjm2 at 13:31, 18 January 2019

2019-01-18T13:31:27Z

← Older revision		Revision as of 13:31, 18 January 2019
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	T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]]~~ ~~and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-~~tubule<span style="line-height: 19.9200000762939px;">s~~, the area that is associated ~~wit</span>h~~ regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]]~~ ~~is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad~~ ~~<ref>http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html</ref>		T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubules, the area that is associated with regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad<ref>http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html</ref>.

	When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]]~~ ~~in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal [[Cisternae\|cisternae]], releasing calcium ions. [[Calcium\|Calcium]] ions flow into the [[Cytoplasm\|cytoplasm]] where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur~~ ~~<ref>http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm</ref>.~~<br>~~		When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal [[Cisternae\|cisternae]], releasing calcium ions. [[Calcium\|Calcium]] ions flow into the [[Cytoplasm\|cytoplasm]] where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur<ref>http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm</ref>.

	=== References~~<br>~~ ===		=== References ===

	<references />		<references />

170444383: Added a link to the word 'cisternae'

2018-12-05T12:32:22Z

Added a link to the word 'cisternae'

← Older revision		Revision as of 12:32, 5 December 2018
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	T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad <ref>http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html</ref>		T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad <ref>http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html</ref>

	When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. [[Calcium\|Calcium]] ions flow into the [[~~cytoplasm~~\|cytoplasm]] where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur <ref>http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm</ref>.<br>		When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal [[Cisternae\|cisternae]], releasing calcium ions. [[Calcium\|Calcium]] ions flow into the [[Cytoplasm\|cytoplasm]] where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur <ref>http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm</ref>.<br>

	=== References<br> ===		=== References<br> ===

	<references />		<references />

Nnjm2: Corrected references.

2014-11-19T12:18:01Z

Corrected references.

← Older revision		Revision as of 12:18, 19 November 2014
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	T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad. ~~[1]~~		T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad <ref>http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html</ref>

	When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. Calcium ions flow into the cytoplasm where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur. ~~[2]~~<br><br>		When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. [[Calcium\|Calcium]] ions flow into the [[cytoplasm\|cytoplasm]] where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur <ref>http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm</ref>.<br>

	<br>		=== References<br> ===

	~~References:~~		<references />

	~~[1] http:~~/~~/www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html~~

	~~[2] http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm~~

130076669 at 11:47, 19 November 2014

2014-11-19T11:47:06Z

← Older revision		Revision as of 11:47, 19 November 2014
Line 1:		Line 1:
	T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[~~Skeletal_Muscle~~\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[~~Sarcoplasmic_Reticulum~~\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad. [1]		T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils\|myofibrils]] of [[Skeletal Muscle\|skeletal muscle]] and are invaginations in the [[Sarcolemma\|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubule<span style="line-height: 19.9200000762939px;">s, the area that is associated wit</span>h regions of the [[Sarcoplasmic Reticulum\|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad. [1]

	When the T- tubule is depolarised due to an incoming [[~~Action_potential~~\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. Calcium ions flow into the cytoplasm where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur. [2]<br><br>		When the T- tubule is depolarised due to an incoming [[Action potential\|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. Calcium ions flow into the cytoplasm where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur. [2]<br><br>

	<br>		<br>

	References:		References:

	[1] http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html		[1] http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html

	[2] http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm		[2] http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm

130076669: T-tubules

2014-11-19T11:46:39Z

T-tubules

New page

T-tubules or transverse tubules run perpendicular to the long axis of the fibres in the [[Myofibrils|myofibrils]] of [[Skeletal_Muscle|skeletal muscle]] and are invaginations in the [[Sarcolemma|sarcolemma]]. The tubules enter the sarcoplasm and extend over the sarcoplasmic reticulum at the junctions of the A and I bands. On either side of the T-tubules, the area that is associated with regions of the [[Sarcoplasmic_Reticulum|sarcoplasmic reticulum]] is known as the terminal cisternae. The T-tubules and the terminal cisternae do not touch, however, but each T-tubule is associated with two terminal cisternae, and the three structures together are known as a triad. [1]

When the T- tubule is depolarised due to an incoming [[Action_potential|action potential]] in the sarcolemma, the impulse is carried down the t-tubules and opens the gates in the sarcoplasmic reticulum on the associated terminal cisternae, releasing calcium ions. Calcium ions flow into the cytoplasm where the actin and myosin filaments are. The calcium ions bind to the troponin-tropomyosin molecules located on the actin filaments and the power stroke is able to occur. [2] 

 

References:

[1] http://www.getbodysmart.com/ap/muscletissue/fibers/sr/tutorial.html

[2] http://web.archive.org/web/20080401093325/http://www.lib.mcg.edu/edu/eshuphysio/program/section2/2ch3/communic.htm