New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Anatomy and Physiology: Sketetal Muscle Mechanics and Metablolism

by: Olivia may

Anatomy and Physiology: Sketetal Muscle Mechanics and Metablolism ANPS 019

Marketplace > University of Vermont > ANPS 019 > Anatomy and Physiology Sketetal Muscle Mechanics and Metablolism
Olivia may
GPA 3.9

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Anatomy and Physiology: Sketetal Muscle Mechanics and Metablolism. Lecture 16 objectives answered.
Human Anatomy and Physiology
Sean Flynn
Class Notes
Anatomy and Physiology I, anatomy and physiology, Sketetal Muscle Mechanics, Sketetal Muscle, Metablolism, ANPS 019, UVM
25 ?




Popular in Human Anatomy and Physiology

Popular in Department

This 3 page Class Notes was uploaded by Olivia may on Tuesday October 18, 2016. The Class Notes belongs to ANPS 019 at University of Vermont taught by Sean Flynn in Fall 2016. Since its upload, it has received 4 views.


Reviews for Anatomy and Physiology: Sketetal Muscle Mechanics and Metablolism


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 10/18/16
Lecture objectives 16 1. Describe and identify the components of the motor unit A single motor neuron + fibers it controls = a motor unit 2. Describe the components of a muscle twitch Muscle twitch - a motor unit's response to a single action potential from the motor neuron Latent Period​ - first few milliseconds, excitation - contraction coupling starts, cross bridges formed but no measurable shortening Contraction Period​ - 10-100 ms, cross bridges active, reach peak of muscle tension, muscles may shorten Relaxation Period​ - 10-100 ms, initiated by Ca2+ re entry into the SR, decreased number of active cross bridges, muscle tension decreased to zero, muscle returns to initial length 3. What is muscle tension? How is the difference from muscle tone? Muscle tension​ - force exerted by a contracting skeletal muscle on an object, muscle does not always shorten Muscle tone​ - relaxed muscles are always slightly contracted, generated by involuntary neural stimulation, involved in maintenance of posture and joint stabilization, NOT movement 4. Describe why muscle responses are graded and how frequency and strength of stimulation modulate that response Graded response - contract to varying degrees based on load. Same muscle that lift a pencil lift a 40 lb weight. Frequency - Wave summation - (low stimulus frequency) another stimulus is added before muscle relaxes completely, which increases tension b/c not al Ca2+ is removed which mean more active cross bridges - (high stimulus frequency) NOT a physiological event - muscle reached max tension then fails and tension drops to zero - tetanus events Strength of Stimulation - Sub-threshold stimulus - no observable contraction Threshold stimulus - the stimulus at which the first observable contraction occurs Size principal - small, more excitable fibers are recruited first, large, less excitable fibers are recruited only for powerful contractions. Individual motor units may be recruited ​asynchronously​ to delay fatigue 5. Compare and contrast isometric and isotonic contraction Isometric - “same measure”, the load exceeds muscle peak, contracting is not visible but there is tension. Isotonic - “same tension”, muscle forms enough tension to over some load and contract. Tension remains constant for the rest of the contraction. Concentric - muscle shortens as it does work Eccentric - muscle lengthens to generate force 6. How do muscle cell use and generate energy Hydrolysis of ATP resulting and ADP and a phosphate 7. What are the 3 metabolic pathways used by muscles to generate ATP At rest muscle store about 4-6 seconds of ATP for activity Immediate supply via direct phosphorylation -​ coupled reaction of creatine phosphate and ADP ---> creatine kinase-----> creatine and ATP - does NOT require oxygen - about 15 seconds of activity Short term supply via anaerobic cellular respiration ​- glucose from oxygen stored in blood supply, glycolysis in cytosol, glucose converted into two pyruvate molecules releasing 2 ATP molecules, lactic acid is then released into the blood due to compression of blood vessels and resulting oxygen deficiency Long term supply via aerobic cellular respiration​ - occurs within mitochondria, REQUIRES OXYGEN, pyruvate oxidizes to carbon dioxide, transfer of chemical bond energy to NADH and FADH2, energy used to generate ATP by oxidative phostoplation, 32 net ATP produced per glucose, ​after 30 minutes free fatty acids are also used for aerobic respiration and are the preferential fuel molecules for most skeletal muscle 8. How does exercise and aging affect muscle cells?


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.