Class Notes (835,069)
Canada (508,910)
ANAT 101 (98)
Lecture

Lecture #9 - Muscle Tissue.doc

5 Pages
45 Views
Unlock Document

Department
Anatomy and Cell Biology
Course
ANAT 101
Professor
Richard Oko
Semester
Winter

Description
Lecture #9 - Muscle Tissue 3 Types of Muscle Tissue 1) Skeletal muscle tissue -large body muscles, for movement -long, cylindrical, striated, multinucleate (nuclei are pushed to the side) -voluntary 2) Cardiac muscle tissue -found only in heart -short, branched, striated, usually single nucleus (nuclei in centre) -involuntary 3) Smooth muscle tissue -found in walls of blood vessels -around hollow organs (ex. urinary bladder) -around respiratory, digestive, reproductive tracts -short, spindle-shaped, nonstriated, single, central nucleus -voluntary 5 Functions of Skeletal Muscles 1) Produce movement of skeleton -pull on tendons that move bones 2) Maintain posture and body position 3) Support soft tissues -with muscles of abdominal wall and pelvic floor 4) Guard entrances and exits -in the form of sphincters 5) Maintain body temperature -when contraction occurs, energy is used and converted to hear Organization of Skeletal Muscle Tissue Skeletal muscles contain -connective tissue Lecture #9 - Muscle Tissue -blood vessels -nerves -skeletal muscle tissue Single skeletal muscle cells (aka skeletal muscle fibers) 3 Layers of Connective Tissue 1) Epimysium -covers entire muscle 2) Perimysium -divides muscle into bundles called fascicles -contain blood vessels and nerves 3) Endomysium -covers each muscle fiber, ties fibers together -contains capillaries and nerves The Sarcolemma and Transverse Tubules sarcolemma: muscle fibre plasma membrane -has openings across surface that lead into network of transverse tubules (t tubules) -t tubules: allow for electrical stimuli to reach deep into each fiber sarcoplasm: muscle fiber cytoplasm Lecture #9 - Muscle Tissue Myofibrils in Muscle Fiber • hundreds to thousands in each fiber • encircled by T tubules and are as long as the entire muscle fiber • bundles of thick and thin myofilaments -actin molecules are found in thin filaments -myosin molecules are found in thick filaments • are contractile proteins that shorten and are responsible for contrac
More Less

Related notes for ANAT 101

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit