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WorksheetsHuman Bio- Skeletal Muscle
Total questions: 24
Worksheet time: 15mins
The three basic muscles
Skeletal
Rough
Smooth
Cardiac
Skeletal muscles are attached to bone by what?
(a)
Characteristic of skeletal muscles
Striated
smooth
multi nucleated
intercalated disks
voluntary
what is smooth muscle in
in the heart
attached to bones
In organs
skin
Endomysium
encloses a single muscle fiber
wraps around a fascicle (bundle) of muscle fibers
covers the entire skeletal muscle
on the outside of the epimysium
Epimysium
encloses a single muscle fiber
wraps around a fascicle (bundle) of muscle fibers
covers the entire skeletal muscle
on the outside of the epimysium
Perimysium
encloses a single muscle fiber
wraps around a fascicle (bundle) of muscle fibers
covers the entire skeletal muscle
on the outside of the epimysium
Fascia
encloses a single muscle fiber
wraps around a fascicle (bundle) of muscle fibers
covers the entire skeletal muscle
on the outside of the epimysium
Sites of muscle attachment
Bones
skin
Cartilages
Connective tissue coverings
Epimysium has two connective tissue attachments
Aponeuroses
Tendons
Joints
Smooth Muscle Characteristics
Spindle-shaped cells
Single nucleus
striations
Involuntary
in the walls of hollow organs
Cardiac Muscle Characteristics
Striations
voluntary
Found in organs and the heart
Branching cells
Usually has single nucleus
Skeletal Muscle Functions
Produce movement
Maintain posture
Stabilize joints
Generate heat
Sarcolemma
long organelles inside muscle cell
specialized plasma membrane
specialized smooth endoplasmic reticulum (holds calcium)
Contains only thin filaments
Contains the entire length of the thick filaments
I band (Light band)
long organelles inside muscle cell
specialized plasma membrane
specialized smooth endoplasmic reticulum (holds calcium)
Contains only thin filaments
Contains the entire length of the thick filaments
Myofibrils
long organelles inside muscle cell
specialized plasma membrane
specialized smooth endoplasmic reticulum (holds calcium)
Contains only thin filaments
Contains the entire length of the thick filaments
Sarcoplasmic reticulum
long organelles inside muscle cell
specialized plasma membrane
specialized smooth endoplasmic reticulum (holds calcium)
Contains only thin filaments
Contains the entire length of the thick filaments
A Band (Dark Band)
long organelles inside muscle cell
specialized plasma membrane
specialized smooth endoplasmic reticulum (holds calcium)
Contains only thin filaments
Contains the entire length of the thick filaments
Thick filaments have
myosin
Anchored to the Z disc
Has ATPase enzymes
Myosin filaments have heads (extensions, or cross bridges)
actin
Thin filaments
myosin
Anchored to the Z disc
Has ATPase enzymes
Myosin filaments have heads (extensions, or cross bridges)
actin
Excitability (also called responsiveness or irritability)
ability to recoil and resume resting length after stretching
ability to receive and respond to a stimulus
ability to shorten when an adequate stimulus is received
ability of muscle cells to be stretched
Elasticity
ability to recoil and resume resting length after stretching
ability to receive and respond to a stimulus
ability to shorten when an adequate stimulus is received
ability of muscle cells to be stretched
Extensibility
ability to recoil and resume resting length after stretching
ability to receive and respond to a stimulus
ability to shorten when an adequate stimulus is received
ability of muscle cells to be stretched
Contractility
ability to recoil and resume resting length after stretching
ability to receive and respond to a stimulus
ability to shorten when an adequate stimulus is received
ability of muscle cells to be stretched
