The Sliding Filament Theory
When a muscle cell is at rest, most of the intracellular calcium is found stored in the ___________.
a.sarcoplasm
b.T tubule
c.sarcoplasmic reticulum
d.myosin heads
c.sarcoplasmic reticulum
A single contraction in response to a single threshold stimulus is defined as _________.
a.summation
b.tetany
c.treppe
d.a twitch
d.a twitch
Thick filaments are found in the ________ of the sarcomere.
a.Z disc
b.I band
c.A band
d.All of the above contain thick
filaments.
c.A band
The two main types of criteria for joint classification are ______.
a.size and structure
b.size and shape
c.structure and function
d.shape and function
c.structure and function
Synovial joints are examples of __________.
a.amphiarthroses
b.diarthroses
c.synarthroses
d.synchondroses
b.diarthroses
Calcium ions will bind to ________ when present in the sarcoplasm.
a.myosin heads
b.ATP
c.myosin-binding sites
d.troponin
d.troponin
Smooth muscle cells can contract as a unit because of the presence of __________.
a.dense bodies
b.gap junctions
c.diffuse junctions
d.motor end plates
b.gap junctions
In a resting muscle cell, the myosin-binding sites are blocked by ________.
a.actin
b.troponin
c.titin
d.tropomyosin
d.tropomyosin
The hip joint is an example of a(n) ______.
a.synchondrosis
b.synarthrosis
c.amphiarthrosis
d.diarthrosis
d.diarthrosis
A unique feature of synovial joints is __________.
a.a joint cavity
b.cartilage
c.ligaments
d.All of the above are unique to synovial joints.
a.a joint cavity
What substance must bind to myosin heads in order for the heads to detach from the thin filaments?
a.Calcium
b.ATP
c.Troponin
d.Sodium
b.ATP
What is the functional unit of a skeletal muscle termed?
a.The sarcomere
b.The A band
c.The myofibril
d.The sarcolemma
a.The sarcomere
What movement has occurred when you bend your fingers to make a fist?
a.Adduction
b.Extension
c.Flexion
d.Rotation
c.Flexion
A fibrous joint connected by ligaments is classified as a ________.
a.suture
b.syndesmosis
c.gomphosis
d.symphysis
b.syndesmosis
All of the following are structural components of a synovial joint EXCEPT ______.
a.bursae
b.ligaments
c.articular cartilage
d.synovial fluid
a.bursae
T tubules are an extension of the ___________.
a.sarcomere
b.sarcoplasmic reticulum
c.sarcolemma
d.endomysium
c.sarcolemma
When the sole of your foot is turned medially, _______ has occurred.
a.eversion
b.inversion
c.dorsiflexion
d.plantar flexion
b.inversion
Which of the following is a cartilaginous joint?
a.Suture
b.Syndesmosis
c.Gomphosis
d.Symphysis
d.Symphysis
These are the most freely movable type of synovial joint with the broadest range of movement.
a.Ball-and-socket
b.Condyloid
c.Hinge
d.Pivot
a.Ball-and-socket
How does calcium reenter the terminal cisterns after muscle contraction is finished?
a.Diffusion
b.Active transport
c.Filtration
d.Endocytosis
b.Active transport
Which is NOT a factor that affects the force of muscle contraction?
a.Relative size of muscle fibers
b.Number of muscle fibers stimulated
c.Degree of muscle stretch
d.Method of muscle stimulation
d.Method of muscle stimulation
Biting into food involves which of the following types of movement?
a.Elevation and retraction
b.Protraction and depression
c.Retraction and protraction
d.Depression and elevation
d.Depression and elevation
Which of the following is an example of a synarthrosis?
a.Diarthrosis
b.Suture
c.Symphysis
d.Synovial
b.Suture
The proximal ends of the radius and ulna form which type of joint?
a.Condyloid
b.Hinge
c.Pivot
d.Plane
c.Pivot