Other
Muscle Physiology Reviewer Notes
- Course
- Institution
- Book
Summarized Muscle Physiology Notes
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Receptor Potential
-
Cell membrane summary
-
TEST BANK FOR HUMAN PHYSIOLOGY FROM CELLS TO SYSTEMS SHERWOOD 9TH EDITION
Seller
Follow
frncssssm
Content preview
Chapter 9: SECTION BMuscle Physiology attached, so the latent period is due only to the
Mechanics of Single Fiber Contraction excitation-contraction coupling delay
- In the isotonic twitch, the latent period includes:
2 opposing forces during muscle contraction: time of excitation-contraction coupling delay and
●Tension: force exerted by a contracting muscle a brief period of isometric contraction. During
●Load: force exerted by an object which, muscle can develop enough cross-bridge
cycling to enable the fiber to lift the load from the
Simple twitch contraction surface of an object.
● Event of muscle contraction as a parabolic
tracing- a curved graph; a single muscle contraction Load-Velocity Relation
of a single muscle fiber by a single stimulus. - Velocity: muscle shortening
- Increasing load = decreasing velocity of muscle
3 stages of contraction: fiber shortening
1. Latent period- a brief interval (1-2ms) of - Decreasing load = increasing velocity
assuming inactivity of the muscle fiber - No load = highest velocity
between the application of stimulus and the - Highest tension = no velocity
application of tension to the muscle;
corresponds to the time of excitation events Frequency-Tension Relation
that occur in the muscle prior to tension - 1 action potential in a muscle fiber lasts only
building. for 0.1-0.2secs
2. Contraction period- steep upward curve - Summation: possible to stimulate the muscle
from the pt. of tension development to the pt. to contract before its first contraction has
of peak tension development of the muscle finished; summated contraction
3. Relaxation period- downward curve; muscle - Unfused tetanus: incomplete summations
resume its original length - Treppe contractions: unfused tetanus in an
ascending manner; bladder-like contractions
3 main kinds of muscle contraction: (german); fundamental reason why we have to
(based on relative magnitudes of load and tension) warm up when we gauge in muscular activity;
● Isometric contraction we make calcium ions more available and at the
- Load > tension same time increase the # of myofibrils
- Muscle develops tension but does not shorten contracting w/ an increasing stimuli.
and move the load or object - Fused tetanus/summation: complete
- Shorter latent period* summation that produces a plateau of the
- Longer duration of mechanical event* contractions; does not go on indefinitely,
● Isotonic contraction produces a downward slope at one point
- Tension > load (muscle fatigue); even in continuous application
- Load or object is moved by the muscle of stimulus, no contraction can be made
- Longer latent period* anymore in the fatigued muscle; fatigued
- Briefer duration of mechanical event or muscle= loss of energy reserves or source
shortening* (ATP)
● Lengthening contraction:
- “eccentric contraction” Length-Tension Relation
- Load is much greater than what the maximum - The strength or tension that can be developed
isometric tension can develop; muscle stretches by a muscle can be changed by the length of
because load > max. isometric tension the fiber before contraction.
- 60% longer or shorter from the optimum
*Reason for this difference: length = no tension when stimulated
- In the isometric twitch, tension begins to - Increase length from this point = active
increase as soon as the first cross-bridge is isometric tension @ each length is increased
up to a maximum optimum length
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller frncssssm. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50064 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now