MYTUTOR SUBJECT ANSWERS

208 views

Explain how skeletal muscle contraction is stimulated

A nerve impulse travelling down a motor neurone causes the release of acetylcholine from the synpatic knob into the synaptic cleft. This then diffuses across the synaptic cleft down its concentration gradient and binds to complementary receptors on the sarcolemma. This binding causes the opening of ion channels associated with the acetylcholine receptor, leading to an influx of positive ions and a depolarisation of the sarcolemma which spreads along to invaginations of the membrane known as T tubules. These structures are in close conjunction with sarcoplasmic reticulum, and the depolarisation causes subsequent calcium ion release from the sarcoplasmic reticulum. Calcium ions diffuse through the sarcoplasm and bind to tropinin, intiating the sliding of the myosin and actin filaments and the contraction of skeletal muscle. 

Michael J. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry ...

8 months ago

Answered by Michael, an A Level Biology tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

126 SUBJECT SPECIALISTS

£20 /hr

Ed S.

Degree: Biology (Masters) - Sheffield University

Subjects offered: Biology, Spanish+ 2 more

Biology
Spanish
Extended Project Qualification
-Personal Statements-

“Hello Parents & Students! My name is Ed and I'm a biology student at the University of Sheffield. In short, I'm mad about all things animal, with a particular interest in the field of marine conservation. Additionally, I have a real p...”

MyTutor guarantee

£20 /hr

Zoe B.

Degree: Bsc Psychology (Bachelors) - Exeter University

Subjects offered: Biology, Psychology

Biology
Psychology

“Who am I? Hi there, my name is Zoe. I am currently in my first year at the University of Exeter studying Psychology. I have for a long time had a great interest and passion for Psychology and love to read into different areas. Somethi...”

£20 /hr

Michael J.

Degree: History (Bachelors) - University College London University

Subjects offered: Biology, History+ 1 more

Biology
History
.HAT.

“About Me: I am a History student at UCL. My interests in History are mainly modern, focusing on the Russia and the Cold War and more recently the history of political thought and tea. I also have a love of Science from my A-levels. I ...”

About the author

Michael J.

Currently unavailable: for new students

Degree: Medicine (Bachelors) - Oxford, The Queen's College University

Subjects offered: Biology, French+ 1 more

Biology
French
Chemistry

“Hi! My name is Michael, and I'm a medical student at Oxford University! I'm a friendly, hard working and engaging tutor with plenty of experience working with children in a classroom environment and on a one to one basis. What can I o...”

You may also like...

Posts by Michael

Explain how skeletal muscle contraction is stimulated

Outline the lock and key mechanism of enzyme-controlled reactions

What is the imperfect tense and how do I conjugate it?

Other A Level Biology questions

What occurs during an action potential in a neuron?

How do humans regulate their body temperature?

What are the levels of protein structure?

What are the two main secondary structures of proteins?

View A Level Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok