Q. The layer of connective tissue that separates the muscle tissue into small sections is called the ______________.
A. aponeuroses
B. epimysium
C. perimysium
D. endomysium
Answer- perimysium
Q. The segment of a myofibril that is called a sarcomere runs from _______________.
A. one Z line to the next Z line
B. one H zone to the next H zone
C. one A band to the next A band
D. one end of a skeletal muscle to the opposite end
Answer- one Z line to the next Z line
Q. The ______________ are an invagination of the muscle cell's sarcolemma.
A. sarcoplasmic reticula
B. transverse (T) tubules
C. cisternae
D. microtubules
Answer- transverse (T) tubules
Q. Into what does the neuron release its neurotransmitter at the neuromuscular junction?
A. motor end plate
B. cytoplasm of the muscle cell
C. cisternae
D. synaptic cleft
Answer- synaptic cleft
Q. A motor unit is made up of _______________.
A. all the muscle fibers within a given muscle
B. a motor neuron and the muscle fibers it innervates
C. all the neurons going into an individual section of the body
D. a fascicle and a nerve
Answer- a motor neuron and the muscle fibers it innervates
Q. The crossbridges involved in muscle contraction are located on the ________________.
A. myosin myofilaments
B. actin myofilaments
C. tropomyosin
D. dystrophin
Answer- myosin myofilaments
Q. Which of these statements is correct regarding muscle contraction?
A. All motor units act together.
B. Muscle contraction continues for long periods after nervous stimulation ceases.
C. The crossbridges bind to the actin and shorten the sarcomeres.
D. Dystrophin is not needed to strengthen the contracting muscle cell.
Answer- The crossbridges bind to the actin and shorten the sarcomeres.
Q. When a nervous impulse travels from a neuron to a muscle cell, what happens next?
A. The impulse travels over the sarcolemma in all directions.
B. Calcium is released from the sarcoplasmic reticulum.
C. Linkages form between the actin and myosin.
D. Acetylcholine is decomposed by acetylcholinesterase.
Answer- The impulse travels over the sarcolemma in all directions.
Q. One of the following statements about muscular responses is not true. Choose that one.
A. A muscle fiber contracts in an all-or-none fashion.
B. There is a slight latent period that occurs between when the stimulus arrives at the muscle and when the muscle contracts.
C. Muscles will add motor units to a contraction, increasing the overall force of contraction.
D. When a person is fully at rest, none of her muscles are contracting.
Answer- When a person is fully at rest, none of her muscles are contracting.
Q. The type of muscle found in the irises of the eyes and in the blood vessels is called _______________.
A. visceral smooth muscle
B. multiunit smooth muscle
C. cardiac muscle
D. skeletal muscle
Answer- multiunit smooth muscle
Q. Why can cardiac muscle fibers contract for longer periods than skeletal muscle fibers?
A. Cardiac muscle is self-excitatory.
B. Extracellular calcium partially controls the strength (and length) of contraction.
C. Cisternae of T-tubules is more developed in cardiac muscle.
D. Cardiac muscle is uninucleate rather than multinucleate.
Answer- Extracellular calcium partially controls the strength (and length) of contraction.
Q. Which muscle enables you to pucker your lips for a kiss?
A. epicranius
B. buccinator
C. orbicularis oris
D. orbicularis oculi
Answer- orbicularis oris
Q. The muscle that enables you to elevate and adduct your scapula is the ____________.
A. serratus anterior
B. sternocleidomastoid
C. splenius capitis
D. rhomboideus major
Answer- rhomboideus major
Q. Which muscle is the strongest flexor of the elbow?
A. brachialis
B. biceps brachii
C. brachioradialis
D. deltoid
Answer- brachialis
Q. The biceps femoris is one hamstring muscle located on the back of the thigh. Which muscle is the other hamstring?
A. adductor magnus
B. semitendinosus
C. gluteus maximus
D. quadriceps femoris
Answer- semitendinosus
Q. Which of the following does not belong with the others?
A. multinucleated
B. skeletal
C. striated
D. involuntary
Answer- involuntary
Q. Each muscle fiber is directly surrounded by connective tissue called the _____.
A. perimysium
B. fascia
C. endomysium
D. epimysium
Answer- endomysium
Q. Which term is the smallest subdivision in this group?
A. fiber
B. fibril
C. filament
D. actin
Answer- actin
Q. Which description of muscle contraction means that all of the fibers within a muscle are fully contracted?
A. all-or-none law
B. summation
C. tetanic
D. muscle twitching
Answer- tetanic
Q. The application of multiple stimuli to a muscle is defined as the process called _____.
A. tetany
B. summation
C. fatigue
D. treppe
Answer- summation
Q. The term _____ refers to the constant state of contraction of a certain number of fibers within a muscle.
A. atrophy
B. hypertrophy
C. summation
D. tone
Answer- tone
Q. Muscles that are not used, may degenerate or undergo a process of _____.
A. atrophy
B. hypertrophy
C. fatigue
D. tetany
Answer- atrophy
Q. Muscles that act to cause similar movements are called _____.
A. antagonists
B. origins
C. insertions
D. synergists
Answer- synergists
Q. The major muscle lining the cheek is the _____.
A. orbicularis oculi
B. orbicularis oris
C. zygomaticus
D. buccinator
Answer- buccinator
Q. The triangle shaped muscle which antagonizes the sternocleidomastoid is the _____.
A. deltoid
B. pectoralis major
C. external oblique
D. trapezius
Answer- trapezius
Q. The antagonist to the triceps brachii is the _____.
A. deltoid
B. pectoralis major
C. brachialis
D. serratus anterior
Answer- brachialis
Q. The term muscle fiber is synonymous with a group of muscle cells.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. The heart muscle will still contract even if removed from the body.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. It is more easy to fatigue an arm muscle than the heart muscle.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. A skeletal muscle also contains smooth muscle fibers within it.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. As nerve fibers come into direct contact with muscle fibers, they form a connection called the neuro- muscular junction.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. The expression "oxygen debt" refers to the lack of sufficient oxygen and lactic acid for contraction.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. Isotonic contractions occur as one tries to lift a table that is nailed to the floor.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE