Question

1. When you touch a hotstove a nerve impulse travels up your arm, passes briefly throughyour central nervous system, and a response is sent down your armto move your hand. The system described here

A.	would also rely on an effector.
B.	has evolved only in humans.
C.	constitutes a neural network.
D.	does not involve the peripheral nervous system.
E.	Both a and c

2.

Which of the followingstatements about voltage-gated channel proteins is true?

A.	If the membrane voltage reaches threshold potential,ions are pumped through the membrane.
B.	If the membrane voltage reaches threshold potential,ions can diffuse through the membrane.
C.	Ions can move through the membrane only if theoverall membrane voltage stays the same.
D.	Ions are pumped through the membrane in order tomaintain existing membrane voltage.
E.	When the gates close, membrane voltage does notchange.

3.

Following depolarization,the neural membrane potential is restored in some neurons when

A.	Na+ ions rush outward through themembrane.
B.	K+ ions rush outward through themembrane.
C.	Cl