All of the following are functions of skeletal muscle tissue except
D) cooling of the body
The three types of muscle tissue are
A) skeletal, cardiac, and smooth
The layer of dense irregular connective tissue that surrounds the entire skeletal muscle is the
C) epimysium
What is the cell membrane of a muscle fiber called?
B) sarcolemma
Each of the following is an attribute of skeletal muscle fibers except
A) lack striations
A thick, fibrous connective tissue cord that attaches a muscle to a bone is called
D) a tendon
What are the principal proteins of muscle contraction?
C) actin and myosin
Which structures extend into the sarcoplasm as a network of deep invaginations of the sarcolemma?
C) transverse tubules
The functional contractile units of a skeletal muscle fiber are the
C) sarcomeres
A nerve impulse triggers the release of what chemical at a neuromuscular junction?
C) acetylcholine (ACh)
Which term describes the expanded tip of an axon at a neuromuscular junction?
C) synaptic knob
Which part of a sarcomere contains entire thick filaments and lateral end regions with overlapping thin filaments?
A) A band
When a muscle fiber contracts, what slides toward the center of each sarcomere?
A) the thin filaments of actin
A reduction in muscle size, tone, and power is called
D) atrophy
A muscle impulse travels deep into the muscle fiber along
C) T-tubule membranes
A single motor neuron, the muscle fibers it controls, and the neuromuscular junctions in between constitute a
C) motor unit
When stimulated by a muscle impulse, what do the terminal cisternae release into the sarcoplasm?
A) calcium ions, Ca2+
The arrangement of tendons and fascicles in a ____________ muscle resembles the structure of a feather.
B) pennate
Types of skeletal muscle fibers include
D) all of the above
Muscle fibers are arranged concentrically in
D) circular muscles
Types of pennate muscles include which of the following?
D) all of the above
Attributes of a convergent muscle include all of the following except
A) fascicles insert obliquely onto a tendon extending through the muscle
The most common levers in the body are ____________ levers.
B) third-class
Most muscles are attached at one end to a less movable point known as the
A) origin
A muscle is classified functionally as an agonist when
D) it is the main muscle that contracts to produce a particular movement
Which of the following describes a first-class lever?
A) the fulcrum is situated between the force and the resistance
All of the following characteristics are used in naming muscles except
C) color
The deltoid muscle is named on the basis of its
B) shape
Of the following terms used in muscle names, which one refers to a specific body region?
A) gluteus
Which of the following characterizes both skeletal and smooth muscle cells?
C) excitable
The "muscular system" includes muscles in which of these locations?
B) surrounding the orbit
How do skeletal muscle fibers get multiple nuclei?
A) fusion of embryonic myoblasts
In skeletal muscle fibers, where do calcium ions occur at varying concentrations?
D) all of the above
In what order would a scalpel first penetrate these layers of connective tissue upon cutting into the biceps brachii muscle: (1) endomysium (2) epimysium (3) perimysium
A) 2, 3, 1
Which list of muscle structures proceeds from smaller to larger in diameter?
D) myofilament, myofibril, muscle fiber, fascicle
What are satellite cells?
B) unfused myoblasts
Blood vessels and nerve fibers that supply skeletal muscle fibers must penetrate the
A) epimysium, perimysium, and endomysium
Synaptic knobs are to axons as ____________ are to sarcolemmae, in that both are structural modifications involved in transmitting electrochemical signals across the synaptic cleft.
D) motor end plates
Skeletal muscle contraction involves which of the following events?
D) all of the above
Of the following, which is the first to occur during muscle contraction?
B) crossbridges link thick and thin filaments
In the sliding filament mechanism, crossbridges are
A) myosin heads that bind to active sites on a thin filament
Interactions between thick and thin filaments during muscle contraction occur in which sequence?
A) attach, pivot, detach, return
What actually shortens when a muscle fiber contracts?
C) sarcomeres, H zones, and I bands
How many motor end plates does a typical skeletal muscle fiber contain?
D) only one
Rigor mortis demonstrates that skeletal muscle tissue
D) all of the above
For any given muscle, the total force exerted by a contraction depends on
B) the number of activated motor units
Physical conditioning can effectively decrease the proportion of which type of muscle fibers?
C) fast
Reflecting their different needs, fast muscle fibers contain large ____________ reserves whereas slow fibers contain the oxygen-carrying pigment ____________.
A) glycogen; myoglobin
An overdose of acetylcholinesterase inhibitors could produce effects most similar to those of
B) tetanus
Among the patterns of fascicle arrangements, ____________ muscles can move their tendons farther but ____________ muscles of the same size are stronger.
C) parallel; pennate
In the limbs, the insertion of a muscle typically lies
A) distal to the origin
In terms of ability to produce ATP, cardiac muscle fibers are most like
A) slow skeletal muscle fibers
Z discs are to skeletal muscle as ____________ are to smooth muscle.
B) dense bodies
Aging affects the muscular system in all of the following ways except
B) decrease in amount of connective tissue within muscles
Author
dahotstuff30
ID
295122
Card Set
Human Anatomy Chapter 10- Muscle Tissue and Organization
Description
Human Anatomy McKinley Chapter 10- Muscle Tissue and Organization
