Please answer all questions.

1			______ surrounds each muscle fasciculus, whereas ______ surrounds each muscle fiber.
			A)	Epimysium, perimysium
			B)	Perimysium, endomysium
			C)	Epimysium, endomysium
			D)	Endomysium, perimysium
			E)	Endomysium, epimysium
2			The basic structural and functional unit of skeletal muscle is the
			A)	fiber.
			B)	fasciculus.
			C)	myofibril.
			D)	sarcomere.
			E)	whole muscle.
3			Which of these units contains overlapping actin and myosin myofilaments?
			A)	A band
			B)	H zone
			C)	I band
			D)	M line
			E)	Z disk
4			Which of these is NOT a part of the actin myofilament?
			A)	actin
			B)	sarcolemma
			C)	tropomyosin
			D)	troponin
5			Each muscle cell is a
			A)	fasciculus.
			B)	sarcomere.
			C)	fiber.
			D)	myofibril.
			E)	myofilament.
6			To establish the resting membrane potential,
			A)	sodium ions diffuse into the cell.
			B)	sodium ions diffuse out of the cell.
			C)	potassium ions diffuse into the cell.
			D)	potassium ions diffuse out of the cell.
			E)	large negative molecules diffuse out of the cell.
7			Before being released from the axon of a neuron, acetylcholine is stored in the
			A)	synaptic vesicles.
			B)	synaptic cleft.
			C)	muscle fiber.
			D)	postsynaptic membrane.
			E)	sarcoplasmic reticulum.
8			During the process of muscle contraction, calcium ions bind to the
			A)	presynaptic terminal.
			B)	sarcolemma.
			C)	synaptic vesicles.
			D)	tropomyosin molecules.
			E)	troponin molecules.
9			During muscle contraction, which of these processes requires ATP?
			A)	Calcium ions are moved back to the sarcoplasmic reticulum.
			B)	Cross-bridges are released.
			C)	Heads of the myosin myofilaments are bent toward the center of the sarcomere.
			D)	Heat is released.
			E)	All of these.
10			Even though each muscle fiber responds in all-or-none fashion, a whole muscle can contract with varying force because of
			A)	different threshold values.
			B)	total tetanus of the muscle.
			C)	recruitment of additional motor units.
			D)	rigor mortis.
			E)	the lag phase of contraction.
11			Anaerobic respiration
			A)	produces 36-38 ATP per glucose molecule.
			B)	produces an oxygen debt.
			C)	occurs in resting muscles or muscles undergoing long-term exercise.
			D)	can use fatty acid to produce ATP.
			E)	All of these.
12			Fast-twitch muscle fibers
			A)	are more resistant to fatigue than slow-twitch fibers.
			B)	have a richer blood supply than slow-twitch fibers.
			C)	have a larger amount of stored glycogen than slow-twitch fibers.
			D)	have more mitochondria than slow-twitch fibers.
			E)	have more myoglobin than slow-twitch fibers.
13			Two muscles that are antagonists are the
			A)	rectus femoris and vastus lateralis.
			B)	vastus medialis and vastus intermedius.
			C)	adductor longus and vastus lateralis.
			D)	rectus femoris and semimembranosus.
			E)	gluteus maximus and semitendinosus.
14			If a woman raised her arms straight out pointing right and left, level with her shoulders, she mostly used her
			A)	biceps brachii muscles.
			B)	latissimus dorsi muscles.
			C)	pectoralis major muscles.
			D)	deltoid muscles.
			E)	All of these.
15			Which of these muscles flexes both the arm and the forearm?
			A)	biceps brachii.
			B)	brachialis.
			C)	deltoid.
			D)	latissimus dorsi.
			E)	triceps brachii.
16			All of the following are functions of the muscular system EXCEPT:
			A)	Maintenance of posture
			B)	Production of body heat
			C)	Communication
			D)	Storage of mineral and fat
			E)	Constriction of organs and vessels
17			Which of the following is not a functional characteristic of skeletal muscle?
			A)	Contractility
			B)	Excitability
			C)	Extensibility
			D)	Elasticity
			E)	All of these are characteristics of skeletal muscle.
18			As the action potential arrives at a presynaptic terminal, the event that causes the release of acetylcholine from synaptic vesicles into the synaptic cleft is:
			A)	Ca++ ions entering the presynaptic terminal
			B)	Na+ ions entering the presynaptic terminal
			C)	Ca++ ions entering the postsynaptic cell
			D)	Na+ ions entering the postsynaptic cell
			E)	Ca++ ions exiting the presynaptic terminal
19			The rotator cuff consists of all of these muscles EXCEPT:
			A)	teres major.
			B)	teres minor.
			C)	subscapularis.
			D)	supraspinatus.
			E)	infraspinatus.
20			In _________ contractions the amount of tension increases during the contraction process, but the length of the muscle does not change.
			A)	isotonic
			B)	isometric
			C)	concentric
			D)	eccentric