Choose the best answer.

1			The muscular system includes skeletal, smooth, and cardiac muscles.
			A)	True
			B)	False
2			What is the property of muscle that allows it to stretch?
			A)	excitability
			B)	conductivity
			C)	contractility
			D)	extensibility
			E)	elasticity
3			Which of these muscles is incorrectly matched in regards to the arrangement of its fascicles?
			A)	rectus abdominis: parallel
			B)	biceps brachii: fusiform
			C)	pectoralis major: convergent
			D)	orbicularis oculi: circular (sphincter)
			E)	deltoid: bipennate
4			The prime mover for elbow extension is the biceps brachii.
			A)	True
			B)	False
5			In a lever system, as the force increases so does the speed or distance of a motion.
			A)	True
			B)	False
6			Most levers in the human body are second-class levers in which the muscle exerts its force between the joint (fulcrum) and the resistance.
			A)	True
			B)	False
7			The sarcoplasmic reticulum is a reservoir for sodium ions that activate the muscle contraction process.
			A)	True
			B)	False
8			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
9			Each A band is composed of thin filaments lying side by side.
			A)	True
			B)	False
10			What is the depression on the sarcolemma at the neuromuscular junction called?
			A)	synaptic knob
			B)	synaptic vesicle
			C)	motor end plate
			D)	junctional folds
11			The neurotransmitter at the neuromuscular junction is acetylcholinesterase.
			A)	True
			B)	False
12			Where fine control of a movement is needed, then the motor unit is small with few muscle fibers under the control of one nerve fiber.
			A)	True
			B)	False
13			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.
14			What is it called when a muscle decreases in size due to a lack of exercise?
			A)	denervation atrophy
			B)	disuse atrophy
			C)	senescence atrophy
			D)	hyperplasia
			E)	hypertrophy
15			All muscles are composed of either slow oxidative or fast glycolytic fibers.
			A)	True
			B)	False
16			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
17			Smooth muscle does not have striations because it does not have thick and thin filaments.
			A)	True
			B)	False
18			During development, myoblasts fuse to form skeletal muscle, cardiac muscle, and smooth muscle.
			A)	True
			B)	False
19			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.