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BIO 160- LECTURE EXAM 2 (MUSCLES)
Quiz Questions
48
Anatomy
Undergraduate 3
03/25/2014

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Term
The return of a contracted muscle fiber to its resting length is an active (energy requiring) process.
Definition
True
Term
Which is the neurotransmitter that causes the release of calcium ions and initiates the steps of skeletal muscle fiber contraction?
Definition
Term
A muscle whose name has "triceps" in it
Definition
has three muscle heads or tendons of origin.
Term
The type of fibers specialized to continue contracting for extended periods of time are
Definition
slow fibers.
Term
The fascicles of a pennate muscle are at an oblique angle to the tendons.
Definition
True
Term
Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest?
Definition
a: Myofibrils
b: Muscle fiber
c: Fascicle
d: Skeletal muscle
Term
The embryonic-like cells that remain in adult skeletal muscle tissue are known as satellite cells.
Definition
True
Term
Which of the following best fills in the blank:? There is/are ______ sarcomeres in each myofibril.
Definition
numerous
Term
The agonist is the muscle that contracts to produce a desired movement.
Definition
True
Term
Using the mandible to close your mouth as you bite on food is an example of a _________.
Definition
third-class lever
Term
Which are the reservoirs that store the calcium required for muscle contraction?
Definition
Terminal cisternae
Term
The fat and connective tissue that encircle a beefsteak is the endomysium.
Definition
False
Term
Interestingly, muscle tissue is found in areas besides the skeletal muscles.
Definition
True
Term
A muscle whose name has "orbicularis" in it is _______ in appearance.
Definition
circular
Term
Generally, a skeletal muscle is composed of
Definition
a: connective tissue sheaths.
b: nerves.
c: arteries.
d: veins.
e: muscle fibers.
Term
When a muscle is isometrically contracted, its length _______ change.
Definition
does not
Term
Which is the correct order of the connective tissue layers of a skeletal muscle, beginning with the outermost first?
Definition
b: Epimysium
c: Perimysium
a: Endomysium
Term
Second-class levers are the most common in the human body.
Definition
False
Term
The type of lever with the fulcrum in the middle is
Definition
First-class
Term
The multiple nuclei in skeletal muscle cells are the result of
Definition
the fusion of myoblasts.
Term
Slow fibers are specialized to continue contracting for extended periods of time without experiencing fatigue.
Definition
True
Term
Which are considered specific characteristics of all muscle cells?
Definition
a: Contractility
b: Extensibility
c: Excitability
d: Elasticity
Term
Parallel muscles will pull _______ than pennate muscles of the same size.
Definition
less
Term
In the resting stage, a muscle with the word rectus in its name always has straight fascicles.
Definition
True
Term
Which contraction occurs when you try to move a wall?
Definition
Isometric
Term
The type of fibers specialized to continue contracting for extended periods of time are
Definition
slow fibers
Term
A muscle whose name has "profundus" in it is located
Definition
deep
Term
In the hierarchy of skeletal muscle fiber components, the myofibril is made up of myofilaments.
Definition
True
Term
The primary function of the abdominal muscles is not to bend, but rather to hold the abdominal organs in place.
Definition
True
Term
Fast fibers fatigue ______.
Definition
rapidly
Term
In the human body the synovial joint between two bones always serves as the fulcrum of the lever.
Definition
True
Term
The biceps brachii is an example of a ________ muscle.
Definition
parallel
Term
Which structures are reservoirs that store acetylcholine?
Definition
Synaptic vesicles
Term
A sarcomere is defined as the distance from one _____ to the next adjacent ____ . (The same answer fills in both spaces.)
Definition
Z disc
Term
A muscle whose name has "pollicis" in it is located
Definition
on the thumb.
Term
The type of muscle fibers that are striated, form Y-shaped branches, and have junctions called intercalated discs are
Definition
cardiac
Term
When a muscle is isometrically contracted, its length _______ change.
Definition
does not
Term
The agonist is the muscle that contracts to produce a desired movement.
Definition
True
Term
The return of a contracted muscle fiber to its resting length is an active (energy requiring) process.
Definition
False
Term
Which apply to synergist muscles?
Definition
a: Assist the agonist
c: May stabilize the point of origin
d: May contribute to tension at the insertion site
Term
A motor unit consists of
Definition
a: a single motor neuron.
b: neuromuscular junctions.
c: muscle fibers.
Term
Smooth muscle tissue is found in such places as the organs of the digestive tract, the walls of blood vessels, and the iris.
Definition
True
Term
When muscle tension is greater than the resistance (weight), movement ______ occur.
Definition
will
Term
The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are
Definition
Term
Interestingly, muscle tissue is found in areas besides the skeletal muscles.
Definition
True
Term
During skeletal muscle contraction more force is created when more motor units are activated.
Definition
True
Term
Parallel muscles exhibit great strength but little endurance.
Definition
False
Term
The tension produced by a muscle fiber is directly proportional to the number of sarcomeres it contains.
Definition
True
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