Download Guided Notes for ppt 1 muscle cell structure

Unit 4 Muscles GN for PPT #1 Anatomy of Skeletal Muscles
Name:________________________________
11/16
Muscle Functions: Movement: ex: _______________,______________________,_______________________
Stability: ex:_______________________________________________________________________
Communication:____________________________________________________________________
Heat Production:____________________________________________________________________
Types of Muscle:
Skeletal: _________________ & _____________________ ex:_____________________________________________
Smooth: _____________________ex: _______________________________________________________________
Cardiac: Heart (of course)
Which two types of muscle are striated?_______________________________________________
Muscle Cell and Connective tissues
Skeletal muscles are composed of ___________________________________________
Skeletal muscle is about _________________diameter and up to ____________________
Muscle Cell = Muscle Fiber
**Muscle fiber is surrounded by connective tissue called : ____________________
(this covering allows for _____________________________________________)
**Muscle fibers are bundled into _________________________
(these can be seen by the naked eye, looks like _______________)
**Each fascile is seperated and wrapped apart from other fascicles by a sheath of
**Connective tissue called the ________________________.
**The entire muscle as a whole is surrounded by another connective tissue layer:
________________________.
**The Epimysium gradually becomes connective tissue sheaths called ________________
** Fascia thikens and becomes _________________________ (no fat) between
Adjacent muscles.
**This becomes _________________________between muscles and skin. Some places very adipose
like_________________.
Fascia also forms into ___________________
Creation of Muscle cells: in Embryonic development ____________________called ________________fuse to produce
each muscle fiber.
Muscle Cellular Organization:
Each muscle fiber (cell) has many__________________________________________
Each muscle fiber (cell) has many _______________________________________________________________________
Muscle fiber has plasma membrane called ___________________________________
Muscle fiber has cytoplasm called _____________________________________________
Muscle fiber has many _______________________________________________
The ______________________contains a lot of _____________________________which provides energy and the
_______________________________stores ______________________.
Other organelles are also packed into the spaces between the myofibrils such as:
Sarcoplastic Reticulum:________________________________________________________
Forms a network around each _______________________.
_________________________: These are Transverse tubules which __________________________________________
_________________________: Produce ATP from O2 and glucose (_______________________________________).
Lets go even smaller and look inside at the Structure of Myofibrils
Myofibrils are the ______________________________that fill most of the muscle cell!!
Each Myofibril is a bundle of _____________________________________________________= Myofilaments
There are 3 kinds of Myofilaments: (Myofilaments are responsible for muscle movement)
1. THICK FILAMENTS: Hundreds of strands of protein called ____________________________ (looks llike golf clubs)
2. THIN FILAMENTS: “2” intertwinde strands of protein called _______________________
(fibrous actin with “globs” of globular actin)
Each g-actin (_______________________) has an active site that binds to the ___________________________
Thin Filaments have 40-60 ___________________________________________________of _______________________
When muscle is RELAXED Tropomyosin BLOCKS ACTINS and _________________________________________________
The thin filaments also have ___________________________ : a Calcium binding protein
Tropomyosine and Troponin are __________________________________
Myosin and Actin are ___________________________________________.
3. ELASTIC FILAMENTS: made of HUGE ______________________called ______________________
They help to stabilize the ____________________________________________________________________.
** Flank thick filaments and Anchor to Z disc
**Center thick filaments between the thin filaments
There are many accessory proteins as well
As many as 20 that help the function of muscles.
Dystrophan: An accessory Protein that:
1. Links Actin in outermost ________________________
2. Transfers ______________________________________________
___________________________________________________________
Muscular Dystrophy is the result of _________________________________
__________________________________
Myofibrils are made up of what three types of filaments?
FILAMENT ORGANIZATION:
Actin and Myosin are in ALL cells and control__________________. In muscle cells they are______________________
And (act to _________________________________).
___________________________are organized in a precise array which is seen as ________________________________
Striated muscle has a _____________________________ alternating with _____________________________________.
Band regions in myofibril:
A Band=___________________________________________________________________________________________
H Bands= __________________________________________________________________________________________
I Bands=___________________________________________________________________________________________
Z Disc=____________________________________________________________________________________________
Sarcomere=_______________________________________________________________________________________
The reason a muscle can shorten is because :____________________________________________________
_____________________________________________________________________________________.
As discs are pulled closer they pull on the _______________________________________________________
________________________________
The Sarcomere is the:__________________________________________________________________