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

A&P I Muscle notes

by: Margaret Notetaker

A&P I Muscle notes BIOL 2500 - 018

Margaret Notetaker
GPA 3.0
Human Anatomy and Physiology I
Shobnom Ferdous

Almost Ready


These notes were just uploaded, and will be ready to view shortly.

Purchase these notes here, or revisit this page.

Either way, we'll remind you when they're ready :)

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

Hey guys, here are the notes for the Muscular System!
Human Anatomy and Physiology I
Shobnom Ferdous
Class Notes
Anatomy & Physiology, Ferdous, auburn
25 ?




Popular in Human Anatomy and Physiology I

Popular in Biology

This 5 page Class Notes was uploaded by Margaret Notetaker on Sunday October 4, 2015. The Class Notes belongs to BIOL 2500 - 018 at Auburn University taught by Shobnom Ferdous in Fall 2015. Since its upload, it has received 72 views. For similar materials see Human Anatomy and Physiology I in Biology at Auburn University.


Reviews for A&P I Muscle notes


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: 10/04/15
CHAPTER 9 amp 10 MUSCULAR SYSTEM Characteristics 1 Excitability a Can receive amp respond to stimuli 2 Contractility a Can shorten when stimulated 3 Extensibility a Stretches 4 Elasticity a Can return to original shape Functions Movement Maintain posture Heat production Stabilize joints Gross Anatomy of Skeletal Muscle Nerves amp Blood Vessels Skeletal muscle bers innervated by nerve endings Highly vascularized for nutrients oxygen energy amp waster removal Connective Tissue Wrappings Epimysium o Surrounds the Whole muscle 0 Dense irregular connective tissue Perimysium o Surrounds each fascicle o Dense regular connective tissue Endomysium o Surrounds each muscle ber 0 Areolar loose connective tissue Functions 0 Support muscle bers 0 Hold muscles together 0 Elasticity of muscle 0 Carries blood vessels amp nerve to muscle bers Attachments Direct epimysium periosteum or perichondrium Indirect via tendons or aponeuroses Origin 0 Point of attachment to immoveable bone Insertion 0 Point of attachment to moveable bone CHAPTER 9 amp 10 MUSCULAR SYSTEM Microscopic Anatomy of Skeletal Muscle Muscle Fiber Multinucleate Plasma membrane is called sarcolemma Cytoplasm is called sarcoplasm 0 Has usual organelles o Glycosomes are granules of stored glycogen o Myoglobin is red pigment that carries oxygen Sarcoplasmic reticulum 0 Smooth endoplasmic reticulum around myo brils 0 Store regulate release calcium Myo bril organelle Z line disc 0 Anchor for actin laments 0 Center of the 1 band M line 0 Anchor for myosin laments 0 Center of the H zone A band 0 Dark area 0 Extends the length of the myosin laments 1 band 0 Light area 0 Only has actin laments 0 Z line is the center 0 H zone 0 Only myosin laments o M line is the center Sarcomere 0 Functional unit 0 Measured Z disc to Z disc 0 Aligned end to end with myo bril Myo lament Myosin o Thicker myo laments o Rodlike tail amp 2 globular heads 0 Heads have binding sites for actin amp ATP Actin o Thinner myo laments 0 Made of Gactin I Polypeptide subunits I Has binding sites for myosin head I 2 strands twisted together Tropomyosin 0 Found in actin myo laments CHAPTER 9 amp 10 MUSCULAR SYSTEM 0 Rodshaped protein 0 Blocks myosinbinding sites on actin when muscle relaxed Troponin o In actin myofllaments o 3 polypeptide subunit complex I l bound to actin I l bound to tropomyosin I l bound to calcium Functional Groups Prime Movers Agonists Muscle provides primary force for causing speci c movement Ex biceps brachii for forearm exion Ex Triceps brachii for forearm extension Antagonists Opposes reverses steadies movement Opposite side of joint as prime mover Ex triceps brachii for forearm exion Synergists Assist prime movers Add extra force to same movement Prevent unwanted movement Ex wrist extensor prevent wrist bending when finger exors contract Fixators Synergists that immobilize bone or muscle s origin Ex muscles for upright posture Naming Skeletal Muscles Location Bonebody region associated with muscle Ex intercostals between ribs Shape Distinctive shape of muscle Ex deltoid triangle Size Relative size of muscle Maximus large Minimus small Direction of muscle fibers Transversus run at right angles Rectus straight Number of origins Bi 2 origins Tri 3 origins CHAPTER 9 amp 10 MUSCULAR SYSTEM Location of attachments Origin is named first Sternocleidomastoid 0 Origin sternum amp clavicle o Insertion mastoid process of temporal bone Action Movement of muscle Adductor adduction Arrangement of Fascicles Circular Arranged in concentric rings Orbicularis oris Convergent Converge towards a single tendon Pectoralis major Parallel Long axis of muscle run parallel to long axis of muscle Sartorius Fusiform Spindle shaped Biceps brachii Pennate Attach to central tendon at an angle Unipennate o Extensor digitorum longus Bipennate o Rectus femoris Multipennate o Deltoid Lever Systems Lever Rigid bar bone that moves about a xed point Fulcrum Fixed point joint Effort Force applied by muscle on the insertion point Load Resistance Bone itself associated tissue Mechanical Advantage Power levers Load is closer to fulcrum than effort applied Small effort can move large load CHAPTER 9 amp 10 MUSCULAR SYSTEM Mechanical Disadvantage Speed levers Load is farther from fulcrum than effort applied Effort must be greater than load First Class Lever Effort applied at one end of lever Load at the other end Fulcrum between effort amp load Operates at mechanical advantage amp disadvantage Effort Fulcrum Load Second Class Lever Effort applied at one end of lever Fulcrum at other end Load between effort amp fulcrum Mechanical advantage Effort Load Fulcrum Third Class Lever Load at one end of lever Fulcrum at other end Effort between load amp fulcrum Mechanical disadvantage Load Effort Fulcrum


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

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Jennifer McGill UCSF Med School

"Selling my MCAT study guides and notes has been a great source of side revenue while I'm in school. Some months I'm making over $500! Plus, it makes me happy knowing that I'm helping future med students with their MCAT."

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.