PALOMAR COLLEGE
Life Sciences Department
Introduction to Anatomy & Physiology (Zoo145); Instructor: Elmar Schmid, Ph.D.
QUIZ #4
- Muscular System I 
Answer the following questions and mark it on a Scantron 882 answer sheet. All questions
must be answered by the student without help by class mates, friends or other human
beings. Please read the following statement below carefully and sign it if you satisfy the
guidelines outlined in this statement. This signed take home exercise sheet must be turned
in with your answer sheet to receive full credit for this assignment. This assignment is due at
the first class meeting the following week.

I HAVE ANSWERED THE QUESTIONS IN THIS EXERCISE ON MY OWN. I DID NOT CONSULT OTHERS OR
IN ANY CONDUCT IN ANY ACTIVITITES THAT COULD BE CONSTRUED AS CHEATING IN THIS
ASSIGNMENT. I DID NOT MAKE ANY COPIES OF THIS ASSIGNMENT.
_________________________________
(PRINT YOUR NAME)
________________________________
(YOUR SIGNATURE)
Q. 1: Which of the following is NOT a function of muscle tissue?
A) Heat production
B) Regulation of organ volume, e.g. lungs
C) Vitamin D production
D) Body movements
E) Body position
Q. 2: Cardiac muscle is a branched muscle tissue and only found in the heart.
A) true
B) false
Q. 3: The type of muscle tissue which is located in the walls of blood vessels and airways is called:
A) striated skeletal muscle
B) striated cardiac muscle
C) non-striated cardiac muscle
D) smooth muscle
E) flight muscle
Q. 4: There are three types of muscle tissue in the human body which are skeletal, cardiac and
smooth muscle.
A) true
B) false
Q. 5: The connective tissue sheath which surrounds bundles of 10 – 100 muscle fibers is called:
A) periosteum
B) epimysium
C) perimysium
D) fasicle
E) sarcolemma
Q. 6: The cell membrane of a muscle cell is called:
A) sarcoplasm
B) sarcolemma
C) sarcoma
D) myofibril
E) endomysium
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PALOMAR COLLEGE
Life Sciences Department
Introduction to Anatomy & Physiology (Zoo145); Instructor: Elmar Schmid, Ph.D.
Q. 7: The reddish-colored pigment located in high concentration in the sarcoplasm of a muscle fiber
and which is important for oxygen storage is called:
A) hemoglobin
B) immunoglobin
C) keratin
D) myoglobin
E) myosin
Q. 8: The protein which makes up the thick filament of the sarcomere is called:
A) myoglobin
B) myosin
C) actin
D) keratin
E) troponin
Q. 9: Which of the following proteins is/are (a) component(s) of the thin filament of a typical muscle
sarcomere?
A) actin
B) troponin
C) tropomyosin
D) myosin
E) all of them, except d, are necessary for the build-up of a thin filament
Q. 10: During muscle contraction the ____ filaments slide past the ____ filaments, as a consequence
of the conformational movement of the heads of the ________ protein.
A) thick … thin … myosin
B) thick … thin … troponin
C) thin … thick … myosin
D) thin … thick … troponin
E) Z disc … thick … troponin
Q. 11: The cell type which is in contact with a unit of muscle fibers and triggers the processes
leading to muscle contraction is called:
A) motor neuron
B) Merkel cell
C) glial cell
D) Schwann cell
E) no nerves are connected to skeletal muscle cells
Q. 12: The neurotransmitter released at the neuromuscular junction is
A) adrenaline
B) acetylcholine
C) glutamine
D) GABA
E) serotonin
Q. 13: Tunnel-like invaginations of the sarcolemma deep into the muscle fiber are
A) sarcomeres
B) myofibrils
C) transverse (or T) tubules
D) tropomyosin
E) synaptic cleft
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PALOMAR COLLEGE
Life Sciences Department
Introduction to Anatomy & Physiology (Zoo145); Instructor: Elmar Schmid, Ph.D.
Q. 14: After activation of the Ach receptor at the motor end plate of the muscle, a muscle action
potential is triggered due to the influx of ________ ions into the muscle fiber.
A) sodium
B) potassium
C) calcium
D) chlorine
E) adrenaline
Q. 15: The bacteria-derived botulinum toxin which is widely used in the currently very fashionable
anti-wrinkle Botox therapy prevents which of the following events at the neuromuscular junction
(NMJ)?
A) the synthesis of acetylcholine
B) the release of acetylcholine from the motor neuron
C) the degradation of acetylcholine in the synaptic cleft
D) the generation of muscle action potentials in the motoric endplate
E) the influx of calcium into the muscle cells
Q. 16: Which of the following substances is/are absolutely necessary for sustained muscle
contraction?
A) calcium
B) ATP
C) acetylcholine
D) sodium
E) all of the above
Q. 17: Muscle fatigue can be caused by which of the following?
A) lack of oxygen
B) build-up of lactic acid
C) build-up of ADP in the myocyte
D) depletion of phosphocreatine
E) any of the above
Q. 18: The type of muscle contraction where there is no change in the length of the muscle but
strong build-up of tension is referred to as:
A) isometric contraction
B) isotonic contraction
C) metabolic contraction
Q. 19: Regarding shape a triangular shaped muscle is called:
A) Quadratus
B) Gracilis
C) Deltoid
D) Trapezoid
E) Orbicularis
Q. 20: You are sipping a soft drink with the help of a straw. Which of the following facial muscles
are you most intensively using?
A) Zygomaticus major
B) Buccinator
C) Orbicularis oculi
D) Occipitofrontalis
E) Orbicularis oris
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PALOMAR COLLEGE
Life Sciences Department
Introduction to Anatomy & Physiology (Zoo145); Instructor: Elmar Schmid, Ph.D.
Look at the Image below and then answer the following questions.
1
2
3
4
14
5
6
8
7
9
10
11
12
13
Anterior
superficial
Anterior
deep
Q. 21: Shown in the Image above, which facial muscles elevate(s) the mandible and (upon
contraction) enable(s) you to close your mouth?
A) only muscle 3
B) muscles 3 and 9
C) muscles 3, 8 and 9
D) muscles 3, 8, 9 and 13
E) none of the above
Q. 22: Detail 7 in the Image above depicts which of the following muscles?
A) temporalis
B) sternocleidomastoid
C) platysma
D) zygomaticus major
E) massetter
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PALOMAR COLLEGE
Life Sciences Department
Introduction to Anatomy & Physiology (Zoo145); Instructor: Elmar Schmid, Ph.D.
Q. 23: The origin of the orbicularis oculi muscle is the:
A) roof of the orbit
B) medial wall of the orbit
C) the zygomatic bone
D) the temporal bone of the skull
E) the occipital bone of the skull
Bonus Q. : A sustained contraction of a muscle is called
A) tetanus
B) summation
C) twitch
D) refractory period
E) latent period
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