Human Anatomy practice test 4
Which of the following statements regarding the quadriceps femoris is correct?
Rectus femoris originates from the anterior inferior iliac spine.
The extensor digitorum extends the phalanges. The extensor digiti minimi extends the distal phalanges only.
The first statement is true; the second is false.
Thin filaments are composed of:
actin plus the regulatory proteins troponin and tropomyosin
Which of the following correctly describes skeletal muscle tissue? 1. composed of nonstriated muscle cells 2. composed of striated muscle cells 3. involuntarily controlled 4. voluntarily controlled
2 and 4 only
An increase (hypertrophy) or decrease (atrophy) in muscle size is due to: 1. increased or decreased numbers of muscle cells. 2. increased or decreased deposition of adipose tissue. 3. increased or decreased size of skeletal muscle fibers.
3 only
The skeletal muscle fibers that fatigue most easily are: 1. red muscle fibers. 2. slow oxidative (type I) fibers. 3. fast glycolytic (type IIb) fibers.
3 only
Ordinarily, the insertion of a muscle: 1. in a limb is proximal to the origin. 2. does not move when the muscle contracts. 3. is the movable point of attachment of a muscle. 4. attaches a muscle to a bone or skin.
3, 4 only
Which of the following extends and abducts the hand at the wrist?
Extensor carpi radialis longus
T/F:Epimysium surrounds skeletal muscle fibers (cells) within fascicles.
FALSE
T/F:The specialized region of sarcolemma that is located at a neuromuscular junction is called the synaptic cleft.
FALSE
The muscles of the medial compartment of the thigh that move the femur, tibia and fibula are:
adductors
Which is a correct statement?thick and thin filaments are arranged into sarcomeres a myofibril contains thick and thin filaments all of these choices are correct a muscle fiber (cell) contains myofibrils
all of these choices are correct
Which of the following characteristics refers to the ability of muscle tissue to repeatedly generate spontaneous action potentials, i.e. as seen in cardiac muscle fibers and some smooth muscle fibers?
autorhythmicity
The ability of muscular tissue to contract forcefully when stimulated is:
contractility
A muscle that crosses the ankle joint anteriorly is capable of primarily____________ the ankle joint.
dorsiflexing
Which type of muscle contraction occurs when a muscle slowly lengthens during contraction? (For example, using your biceps brachii to slowly lower your textbook down onto the table)
eccentric isotonic
The muscles of the posterior compartment of the thigh _____ the thigh and _____ the leg.
extend, flex
A muscle that has an origin on the spine of the scapula and an insertion on the occipital nuchal line is capable of
extending the head
What is the action of the rectus femoris?
extends leg
The ability of muscular tissue to be stretched without being damaged is:
extensibility
The sartorius performs all of the following actions except:
extension of the leg at the knee
What is the action of the flexor digitorum brevis?
flexes toes
The psoas major and iliacus muscles have a common insertion on the femur. These two muscles are involved in _____ of the thigh.
flexion
The greater tubercle of the humerus is the point of insertion of which of the following muscles?
infraspinatus
A muscle that can abduct the hip would most likely be located __________ to the hip joint.
lateral
The frontalis muscle and occipitalis muscle of the scalp are named according to their
location
Which muscle functions to elevate the mandible as in chewing?
masseter
The pectoralis minor muscle
may originate from ribs 3 to 5.
Whereas superficial flexors in the anterior compartment of the forearm originate from the _____ epicondyle of the humerus, the superficial extensors in the posterior compartment of the forearm originate from the _____ epicondyle of the humerus.
medial; lateral
Neurotransmitter receptors are found where on the sarcolemma?
motor end plate
In the neuromuscular junction, the motor end plate is part of the
muscle cell
Which of the following is arranged correctly from the microscopic level to the gross level?
myofibril, muscle fiber, fascicle
One sarcomere contains all of the following EXCEPT:
myofibrils
During contraction in a skeletal muscle fiber:
myosin cross-bridges (heads) move the thin filaments so that their ends meet or overlap in the center of the sarcomere.
The H band is comprised of
myosin only
Which is your "kissing" muscle? (You contract it to pucker your lips.)
orbicularis oris
Which muscle originates from the medial epicondyle of the humerus AND turns the forearm (pronates) so that the palm faces posteriorly?
pronator teres
The origin of a muscle is usually on the bone ____________ to the joint, whereas the insertion of a muscle is usually on the bone ____________ to the joint.
proximal; distal
Which of the following muscles would not flex the knee joint?
rectus femoris
The femoral triangle, shown in the figure, is defined superiorly by the inguinal ligament, medially by the lateral border of the adductor longus muscle, and laterally by medial border of what muscle?
sartorius
Which of these muscles does not contribute to the rotator cuff?
scalenes
Which muscle inserts to the calcaneus via the Achilles (calcaneal) tendon?
soleus
Which of the following pairs of terms does not correctly match muscle with innervation?
trapezius; median pectoral nerve
Of the muscles that move the forearm, two have points of origin on the scapula. They are the biceps brachii and the:
triceps brachii
The primary arm muscle used when doing a push-up would be the _______?
triceps brachii
The two types of smooth muscle tissue are:
visceral (single-unit) and multiunit
T/F: A bundle (fascicle) of skeletal muscle fibers (cells) is separated from neighboring bundles by perimysium.
TRUE
T/F:Cardiac muscle fibers (cells) contain more mitochondria than do skeletal muscle fibers (cells).
TRUE
Which of the following are TRUE about muscle cells? 1. able to contract when stimulated 2. able to respond to stimuli by producing electrical stimuli 3. able to return to their original length and shape after contraction or extension 4. able to stretch, within limits, without being damaged
1, 2, 3 and 4
Which of the functions listed below is/are associated with skeletal muscle? 1. aid the return blood in veins to the heart 2. produce body movements 3. produce heat 4. regulate the volume of hollow organs, e.g. heart, stomach, and urinary bladder 5. stabilize body position
1, 2, 3 and 5 only
The erector spinae is a group of muscles of the back, including which three of the following groups? 1. iliocostalis 2. spinalis 3. segmental 4. longissimus 5. scalene
1, 2, 4
Which of the following is TRUE of myosin? 1. It is located in the A band of the sarcomere. 2. It binds to tropomyosin during contraction. 3. It forms thick filaments. 4. The molecules are helix shaped.
1, 3 only