Choose the best answer.

1			What produces the striations of skeletal and cardiac muscle?
			A)	the transverse (T) tubules
			B)	the intercalated discs
			C)	the arrangement of the myosin and actin molecules
			D)	the sarcolemma
			E)	the triads
2			What is the depression on the sarcolemma at the neuromuscular junction called?
			A)	synaptic knob
			B)	synaptic vesicle
			C)	motor endplate
			D)	junctional folds
3			Which one of the following does NOT happen during muscle contraction?
			A)	The sarcomere shortens.
			B)	The A band shortens or disappears.
			C)	The I band shortens or disappears.
			D)	The H band shortens or disappears.
4			Which one of the following is NOT a characteristic of cardiac muscle?
			A)	one or possibly two nuclei
			B)	rich in glycogen and myoglobin
			C)	large mitochondria filling about 25% of the cell
			D)	repair is primarily by fibrosis
			E)	the ANS is required for stimulation
5			Which of the following occurs with increasing age?
			A)	The lean body mass (muscle) increases with age.
			B)	Muscular strength decreases only slightly with age.
			C)	Fast glycolytic fibers show the earliest and most severe atrophy with age.
			D)	Muscular endurance increases with age.
6			This collective term is used for several genetic diseases in which the skeletal muscles degenerate and can lead to death by the age of 20. What is it called?
			A)	Rhabdomyosarcoma
			B)	Muscular dystrophy
			C)	Rhabdomyoma
			D)	Myasthenia gravis
7			As muscle ages, after age 50, the fibers are replaced with __________ and become _________________.
			A)	water - flaccid
			B)	bone - harder
			C)	fat - weaker
			D)	lean body mass - stronger with exercise
8			Smooth muscle is mostly the cause of waves of contraction called __________________.
			A)	surfing
			B)	circulitus
			C)	peristalsis
			D)	myoblastosis
9			Unlike skeletal and cardiac muscles, smooth muscles are capable of _________________ and hyperplasia.
			A)	atrophy
			B)	edema
			C)	mitosis
			D)	meiosis
10			A characteristic of cardiac muscle seen with the light microscope are __________________.
			A)	intercalated discs
			B)	single cells
			C)	somatic motor neurons
			D)	no nuclei
11			Which is NOT a characteristic of fast glycolytic muscle fibers?
			A)	Larger in size
			B)	Anaerobic metabolism
			C)	High myoglobin content
			D)	White or pale in color
12			The best muscle fiber type for the resistance to fatigue is ________________ fibers.
			A)	slow-oxidative
			B)	intermediate
			C)	fast glycolytic
			D)	no-twitch
13			When a muscle is not used, it shrinks, this is called _________________.
			A)	hypoactivity
			B)	hyperplasia
			C)	atrophy
			D)	hypertrophy
14			The contraction of a muscle fiber normally requires the release of ___________ from the sarcoplasmic reticulum.
			A)	water
			B)	sodium
			C)	calcium
			D)	potassium
15			The myosin-actin cross-bridges require _______________ to break the bonding between the two contractile proteins.
			A)	calcium
			B)	ACh (acetylcholine)
			C)	sodium
			D)	ATP (adenosine tri-phosphate)
16			Synaptic vesicles release ________________________ into the synaptic cleft.
			A)	ACh (acetylcholine)
			B)	calcium
			C)	water
			D)	sodium
17			The thick filament of muscle fibers is composed of this protein. What is it called?
			A)	Actin
			B)	Tropomyocin
			C)	Troponin
			D)	Myosin
18			The sarcoplasm contains an abundance of ______________, which provides stored energy for the muscle to use during exercise.
			A)	water
			B)	myosin
			C)	glycogen
			D)	calcium
19			This red pigment is used to bind oxygen in muscle cells. What is it called?
			A)	Myosin
			B)	Myoglobin
			C)	Glycogen
			D)	Tropomyosin
20			The biceps brachii muscle is an example of this type of lever. Which type of lever is it?
			A)	First-class lever
			B)	Second-class lever
			C)	Third-class lever
			D)	Fourth-class lever