MYTUTOR SUBJECT ANSWERS

444 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 ...

1 year ago

Answered by Michael, an A Level Biology tutor with MyTutor


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

174 SUBJECT SPECIALISTS

£24 /hr

Bobola A.

Degree: Medicine (MBChB - Bachelor of Medicine, Bachelor of Surgery) (Bachelors) - Liverpool University

Subjects offered:Biology, Human Biology+ 2 more

Biology
Human Biology
-Personal Statements-
-Medical School Preparation-

“I believe that genuine enthusiasm is the way in which we can inspire, encourage and teach students. It's what I plan to bring to all my tutoring sessions”

£20 /hr

Calvin A.

Degree: Biomedical Sciences (Bachelors) - Edinburgh University

Subjects offered:Biology, Science+ 4 more

Biology
Science
Physics
Maths
Human Biology
Chemistry

“I am a friendly, passionate, enthusiastic student, studying biomedical sciences at the university of Edinburgh.”

MyTutor guarantee

£30 /hr

Jessica-Lily H.

Degree: MRes Experimental Neuroscience (Masters) - Imperial College London University

Subjects offered:Biology, Psychology

Biology
Psychology

“Top tutor from a world leading university- ready to do all I can to help you get your head around that tricky subject!”

About the author

£20 /hr

Michael J.

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

Describe the main differences between the innate and adaptive immune response?

Describe how the hormone glucagon helps a healthy individual to maintain their blood glucose concentration correctly.

How does light intensity control plant seed germination?

In genetics, what does co-dominance mean?

View A Level Biology tutors

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

mtw:mercury1:status:ok