General Properties of Muscle
Name the three types of muscle
Smooth, Cardiac, Skeletal
Thick filamentous muscle
Myosin
What is the sarcolemma?
Specialized plasma membrane
Cross-Bridge
What is elasticity?
Ability of muscle to return to normal length after stretching.
Where is smooth muscle found in the body?
Iris, Visceral Sides of Organ walls, etc.
Thin Filamentous Muscle
Actin
I bands are considered _______ (Light/Dark) while A bands are considered _______(Light/Dark).
Light, Dark
Why is calcium binding to Troponin so important for the beginning of muscle contraction?
Binding causes a conformational shift and exposes the myosin heads to the actin sites.
What is extensibility?
Capacity of muscle to stretch to normal resting length and beyond after contraction.
This type of muscle(s) is/are voluntarily contracted
Name the layers of connective tissue in skeletal muscle from outside to inside.
Epimysium, Perimysium, Endomysium
Why do muscle cells look striated?
Arrangement of sarcomeres within myofibrils.
This molecule attaches itself to Troponin and kickstarts the sliding filament model of contraction.
Ca2+
What is contractility?
Ability of muscle to shorten and produce tension at its ends.
This type of muscle(s) is involuntarily contracted
Smooth, Cardiac
Name the anatomy of skeletal muscle from small to large in order.
Myofilament, Myofibril, Muscle Fiber, Fasciculus, Muscle Belly, Tendon
True or False: The A gets smaller during muscle contraction.
False.
Follow Up Question: Why?
When the "power stroke" occurs, the myosin head pulls and the actin moves toward the _____ line.
M
What is excitability?
Muscles ability to respond rapidly to chemical or electrical signals.
Name the kind(s) of muscle tissue that is/are striated
Skeletal and Cardiac
In terms of uniqueness of CELLS, what is one of the most unique structures found within MUSCLE CELLS? (Has to do with structure and I've capitalized the important words)
Multinucleated
What is the definition of a functional unit in muscle?
A neuron and all of the muscle fibers that it innervates
List the steps of the sliding filament model of muscle movement
1) Calcium Binds to troponin and exposes actin to myosin
2) Myosin binds actin to from cross-bridge
3)Phosphate is released, myosin pulls actin toward M-Line
4)New ATP comes and resets the process. Discard ADP
What is Plasticity?
Muscles ability to constantly adapt to stretching.