Review the image(s) and answer the following questions.

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1		Where does the energy for actual muscle contraction come from?
			A)	ATP
			B)	acetylcholine
			C)	dystrophin
			D)	myoglobin
2		What produces the shortening of muscle sarcomeres?
			A)	the shortening of the tubulin cytoskeleton
			B)	changes in the sarcoplasmic reticulum
			C)	the sliding of actin myofilaments against the myosin myofilaments
			D)	the covering of the active sites on the actin myofilaments

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3		Myelin sheaths are formed by what type of cells in the peripheral nervous system?
			A)	oligodendrocytes
			B)	astrocytes
			C)	Schwann cells
			D)	microglia
4		What is the function of a myelin sheath?
			A)	regeneration of cut neurons
			B)	insulation of long axons
			C)	increasing rate of impulse conduction along axon
			D)	All of these are correct.

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5		What general trend do we see in the evolution of the brain from the shark to humans, as depicted here?
			A)	increasing importance of the medulla oblongata
			B)	decreasing size of the cerebral hemispheres
			C)	increasing dominance and enlargement of the cerebrum
			D)	increasing dominance of the cerebellum
6		Why are birds shown here on a diverging pathway?
			A)	The bird brain continually decreases in size while the brains of other animals increase in size.
			B)	The bird brain is composed of different subunits than are the others depicted.
			C)	because birds evolved from reptiles on a separate lineage from mammals
			D)	None of these is correct.