Muscular System
The _________ of skeletal muscle play the same role as dense bodies in smooth muscle.
Z discs
a bundle of actin and myosin myofilaments within a muscle cell is called _________
a myofibril
The web between your thumb and palm consists mainly of ________ muscle
adductor pollicis
slow oxidative muscle fibers have all of the following except ______. -an abundance of myoglobin -an abundance of glycogen -high fatigue resistance -a red color -a high capacity to synthesize ATP aerobically
an abundance of glycogen
muscle cells must have all of the following properties except _________ to carry out their function? -extensibility -elasticity -autorhythmicity -contractility -conductivity
autorhythimicity
Which of the following has the least in common with the other four? - vastus intermedius - vastus lateralis - vastus medialis - rectus femoris - biceps femoris
biceps femoris
Ejaculation results from the contraction of the ________ muscle.
bulbospongiosus
The word _____ in a muscle name indicates a function related to the head
capitis
Which of the following muscle proteins is not intracellular? -actin -myosin -collagen -troponin -dystrophin
collagen
The ______ muscle, named for its skeletal attachments, originates on the coracoid process of the scapula, ends on the humerus, and adducts the arm
coracobrachialis
The major superficial muscle of the shoulder, where injections are often given, is the _______.
deltoid
Smooth muscle cells have ________, whereas skeletal muscle fibers do not
dense bodies
a feature found in smooth muscles but lacking from cardiac muscle is ________
dense bodies
The _______ muscle, named for its two bellies, opens the mouth.
digastric
Within a given muscle, which of these connective tissues is deepest? - fascicle - aponeurosis - perimysium - epimysium - endomysium
endomysium
The prime mover of spinal extension is the __________
erector spinae
Any muscle that moves the toes by the belly in the leg would be considered a/an __________ muscle of the the foot
extrinsic
unitary smooth muscle cells can stimulate each other because they have _______
gap junctions
Which of these is not a suprahyoid muscle? - genioglossus - geniohyoid - stylohyoid - mylohyoid - digastric
genioglossus
The most medial adductor of the thigh is the long, slender _______.
gracilis
If a muscle has the word hallucis in its name, it must cause movement of the _____.
great toe
The three large muscles on the posterior side of the thigh are collectively known by the colloquial name of ______ muscles.
hamstring
As its name implies, the ______ nerve controls several muscles of the tongue.
hypoglossal
The _____ and _____ are hip flexors that originate on the pelvis and lumbar vertebrae and converge on a shared tendon that ends on the lesser trochanter of the femur.
iliacus, psoas major
The thyrohyoid muscle attaches to the thyroid cartilage of the ________.
larynx
Which of these muscles of the pelvic floor is the deepest? - superficial transverse perineal - bulbospongiosus - ischiocavernosus - deep transverse perineal - levator ani
levator ani
The abdominal aponeuroses converge on a median fibrous band on the abdomen called the _________
linea alba
The interosseous muscles lie between ________
metacarpal bones
Skeletal muscle fibers develop by the fusion of embryonic cells called __________.
myoblasts
Muscle contains an oxygen-storage pigment called __________.
myoglobin
Thich myofilaments consists mainly of the protein __________
myosin
The region where a motor nerve fiber meets a skeletal muscle fiber is called a/an _____________.
neuromuscular junction or motor end plate
Which of the following muscles could you most easily do without? - flexor digitorum profundus - trapezius - palmaris longus - triceps brachii - tibialis anterio
palmaris longus
A wave of contraction passing along the esophagus or small intestine is called ____________.
peristalsis
ACh receptors are found in ______
postsynaptic membrane folds
The _____ produce(s) lateral grinding movements of the jaw.
pterygoids
The patella is embedded in the tendon of the ________ muscle
quadriceps femoris
Which of the following muscles is an antagonist of the erector spinae? - semispinalis thoracis - rectus abdominis - quadratus lumborum - trapezius - splenius capitis
rectus abdominis
Which of the following muscles does not extend the hip joint? - rectus femoris - gluteus maximus - biceps femoris - semitendinosus - semimembranosus
rectus femoris
Connective tissue bands called ________ prevent flexor tendons from rising like bowstrings.
retinacula
Which of these actions is not performed by the trapezius? - extension of the neck - depression of the scapula - elevation of the scapula - rotation of the scapula - adduction of the humerus
rotation of the scapula
a feature found in skeletal and cardiac muscle but lacking from smooth muscle is ________
sarcomeres
Which of these is not in the anterior compartment of the thigh? - semimembranosus - rectus femoris - vastus intermedius - vastus lateralis - sartorius
semimembranosus
Muscle with the best fatigue resistance can be expected to consist mainly of the ______ type of muscle fibers.
slow oxidative
Both the gastrocnemius and _____ muscles insert on the heel by way of the calcaneal tendon.
soleus
Which of these muscles is an extensor of the neck? - external oblique - sternocleidomastoid - splenius capitis - iliocostalis - latissimus dorsi
splenuis capitis
The ______ muscles diverge like a V from the middle of the upper thorax to attachments behind the ears.
sternocleidomastoid
Acetylcholine is released from organelles called ______________.
synaptic vesicles
Which of these muscles does not contribute to the rotator cuff? - supraspinatus - infraspinatus - subscapularis - teres major - teres minor
teres major
Pronation of the forearm is achieved by two muscles, the pronator ______ just distal to the elbow and the pronator ________ near the wrist.
teres, quadratus
Parts of the sarcoplasmic reticulum called ___________ lie on each side of a T tubule
terminal cisterns
Both the hands and feet are acted upon by a muscle or muscles called ______
the abductor digiti minimi
A muscle that aids in chewing without moving the mandible is _________
the buccinator
The triceps surae is a muscle group composed of _______
the gastrocnemius and soleus
the calcium needed for skeletal muscle contraction comes from ________
the sarcoplasmic reticulum
All of the following muscles act on the vertebral column except - the serratus posterior superior. - the iliocostalis thoracis. - the longissimus thoracis. - the spinalis thoracis. - the multifidus.
the serratus posterior superior
The largest muscle of the upper back is the ________.
trapezius
To activate the contraction of skeletal muscle, calcium ions must bind to the protein _________.
troponin
The anterior half of the perineum is a region called the _________.
urogenital triangle