Muscle growth due to an increase in the size of existing fibers is called a.) fusion extension b.) hypertrophy c.) pericytosis d.) hyperplasia
hypertrophy
Cardiac muscle fibers are attached to one another at a.) A bands b.)sarcomeres c.)intercalated discs d.)T-tubules
intercalated discs
Calmodulin is involved in the contraction of: a.) skeletal muscle b.) cardiac muscle c.) smooth muscle d.) striated muscle
smooth muscle
Which of the following does NOT have T-tubules? a.) skeletal muscle b.) smooth muscle c.) striated muscle d.) cardiac muscle
smooth muscle
Which type of muscle tissue is involuntary, slow in contracting, and able to regenerate considerably better than other types of muscle? a.) skeletal muscle b.) smooth muscle c.) cardiac muscle d.) striated muscle
smooth muscle
When smooth muscles are stretched they contract, but within a short time the tension decreases. This is called a.) incomplete tetanus b.) isotonic eccentric contraction c.) passive contraction d.) stress-relaxation response
stress-relaxation response
Why does muscle strength decrease with aging? a.) The relative number of fast oxidative glycolytic fibers increases with age b.) There is an increase in muscle mass as the person ages. c.) The relative number of slow oxidative fibers increases with age d.) The relative number of fast glycolytic fibers increases with age
The relative number of slow oxidative fibers increases with age
Skeletal muscle fibers are classified as "fast" or "slow" based upon what factor? a.) The ability of the muscle fiber to respond anaerobically b.) The number of mitochondria present c.) The amount of myoglobin present d.) The speed of the myosin ATPase
The speed of the myosin ATPase
Why do you think that a healthy 30-year - old can lift a 25- pound weight much more comfortably than a healthy 80 -year ?old? a.) There is a loss in muscle mass as a person ages b.) There is a decrease in maximum strength as the person ages c.) The number of slow oxidative fibers increases with age d.) All of these are true
All of these are true
On a cellular level, what causes muscle hypertrophy? a.) Increased synthesis of myoglobin b.) Increased synthesis of thick and thin filaments c.) Increased glycogen storage d.) An increase in the number of mitochondria
Increased synthesis of thick and thin filaments
From which type of embryonic tissue do the three types of muscle develop? a.) Mesoderm b.) Ectoderm c.) Myoderm d.) Endoderm
Mesoderm
As Marie rounded the corner, she saw that people were already boarding her bus. Worried that she would miss her ride to campus, she sprinted to the bus stop. In what order were skeletal muscles recruited during her sprint? a.) Slow oxidative, fast oxidative-glycolytic, fast glycolytic b.) Fast glycolytic, slow oxidative, fast oxidative- glycolytic c.) Slow oxidative, fast glycolytic, fast oxidative-glycolytic d.) Fast oxidative- glycolytic, fast glycolytic, slow oxidative
Slow oxidative, fast oxidative-glycolytic, fast glycolytic
In which of the following do skeletal muscle and cardiac muscle differ? a.) Presence of intercalated disks b.) Number and size of mitochondria c.) Length of contraction time d.) Presence of autorhythmic fibers e.) All of these choices
all of these choices
Visceral and multiunit smooth muscle differ in: a.)Innervation b.)Location c.)Number of gap junctions present d.)All of these choices are correct
all of these choices are correct
Skeletal and smooth muscle differ in all of the following except: a.) Contraction mechanism b.) Ability to stretch and maintain ability to contract c.) Cell shape d.) Presence of intermediate filaments
contraction mechanism
Smooth muscle differs from skeletal because smooth muscle a.) is striated b.) has dense bodies instead of Z discs c.) has a lot of sarcoplasmic reticulum d.) is multi-nucleated
has dense bodies instead of Z discs
The embryonic tissue which develops specifically into muscle is called A.) mesoderm b.) osteoblasts C.) satellite cells D.) pericytes
mesoderm
With the exception of the skeletal muscles of the head and extremities, most skeletal muscles develop from a.) dermatome b.) sclerotome c.) mesoderm of the somites d.) endoderm
mesoderm of the somites
Over the past several months, a 24-year-old female has noticed that her eyelids seem to droop. Sometimes she has double vision. She tells her physician that just swallowing her morning vitamin is difficult. Based on her signs, her physician suspects that she has ___. a.) cramps in her throat muscles b.) tremors c.) myasthenia gravis d.) muscular dystrophy e.) fibrillation
myasthenia gravis
