2005-2006 1 AP Biology 2005-2006 AP Biology Muscles & Motor Locomotion Chapter 49. 2005-2006 AP Biology Animal Locomotion What are the advantages of locomotion? motile sessile 2005-2006 AP Biology 2005-2006 AP Biology 2005-2006 AP Biology 2005-2006 AP Biology Muscle voluntary, striated involuntary, striated auto-rhythmic involuntary, non-striated
6
Embed
Animal Locomotion Chapter 49. Muscles & Motor Locomotionschools.misd.org/page/download/8645/0/AnimalsMuscles.pdf · Muscles & Motor Locomotion Chapter 49. AP Biology 2005-2006 Animal
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
2005-20061
AP Biology
2005-2006AP Biology
Muscles &
Motor Locomotion
Chapter 49.
2005-2006AP Biology
Animal Locomotion
What are the advantages of locomotion?
motilesessile
2005-2006AP Biology 2005-2006AP Biology
2005-2006AP Biology 2005-2006AP Biology
Muscle
voluntary,
striated
involuntary, striatedauto-rhythmic
involuntary, non-striated
2005-20062
AP Biology
2005-2006AP Biology
Organization of Skeletal muscle
2005-2006AP Biology
Human endoskeleton
206bones
2005-2006AP Biology
Muscles movement
� Muscles do work by contracting
� skeletal muscles come in antagonistic pairs
� flexor vs. extensor
� contracting = shortening
� move skeletal parts
� tendons
� connect bone to muscle
� ligaments
� connect bone to bone
2005-2006AP Biology
2005-2006AP Biology
Striated skeletal muscle
ZZ
A band = thick filaments = myosin
I band = thin filaments = actin
2005-2006AP Biology
Structure of skeletal muscle
� Sarcomere
� functional unit of muscle contraction
� alternating bands of thin & thick
filaments
2005-20063
AP Biology
2005-2006AP Biology
Sliding Filament mechanism
2005-2006AP Biology
Muscle filaments & Sarcomere
� Interacting proteins
� thin filaments
� braided strands of actin & tropomyosincoiled together
� thick filaments
� myosin molecules
2005-2006AP Biology
Thin filaments: actin
� Proteins
� braid of actin & tropomyosin molecules
� dotted with troponin molecules
2005-2006AP Biology
Thick filaments: myosin
� Protein� myosin molecule
� long protein with globular head
bundle of myosin proteins:
globular heads aligned
together
2005-2006AP Biology
Thick & thin filaments
� Myosin tails together & heads pointed away from center of sarcomere
2005-2006AP Biology
Interaction of thick & thin filaments
� Cross bridges formed between myosin
heads (thick filaments) & actin (thin
flaments) cause the muscle to shorten
(contract)
2005-20064
AP Biology
2005-2006AP Biology
Cross bridge cycle
� Cleaving ATP allows
myosin head to bind to
actinfilament
2005-2006AP Biology
How a muscle works: closeup
� Myosin pulls actinchain along toward center of sarcomere